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166-447: Avgas ( aviation gasoline , also known as aviation spirit in the UK ) is an aviation fuel used in aircraft with spark-ignited internal combustion engines . Avgas is distinguished from conventional gasoline (petrol) used in motor vehicles , which is termed mogas (motor gasoline) in an aviation context. Unlike motor gasoline, which has been formulated without lead since the 1970s to allow

332-516: A Beechcraft Bonanza and ground testing in Continental O-200 , 240 , O-470 , and O-520 engines. In May 2010, TCM indicated that despite industry skepticism, they are proceeding with 94UL and that certification was expected in mid-2013. In June 2010, Lycoming Engines indicated their opposition to 94UL. Company general manager Michael Kraft stated that aircraft owners do not realize how much performance would be lost with 94UL and characterized

498-587: A density of 6.01 pounds per US gallon (720 g/L) at 15 °C (59 °F). (6 lb/U.S. gal is commonly used in America for weight and balance computation.) Density increases to 6.41 pounds per US gallon (768 g/L) at −40 °C (−40 °F), and decreases by about 0.1% per 1 °C (1.8 °F) increase in temperature. Avgas has an emission coefficient (or factor) of 18.355 pounds per US gallon (2.1994 kg/L) of CO 2 or about 3.07 units of weight CO 2 produced per unit weight of fuel used. Avgas

664-803: A fair trial . The English monarchs, through inheritance of substantial territories in France and claims to the French crown, were also heavily involved in conflicts in France, most notably the Hundred Years' War , while the Kings of Scots were in an alliance with the French during this period. Early modern Britain saw religious conflict resulting from the Reformation and the introduction of Protestant state churches in each country. The English Reformation ushered in political, constitutional, social and cultural change in

830-509: A subpolar oceanic climate . Higher elevations in Scotland experience a continental subarctic climate and the mountains experience a tundra climate . The prevailing wind is from the southwest and bears frequent spells of mild and wet weather from the Atlantic Ocean, although the eastern parts are mostly sheltered from this wind. Since the majority of the rain falls over the western regions,

996-587: A welfare state was established, and a comprehensive, publicly funded healthcare system, the National Health Service , was created. The rise of nationalism in the colonies coincided with Britain's much-diminished economic position, so that a policy of decolonisation was unavoidable. Independence was granted to India and Pakistan in 1947. Over the next three decades, most colonies of the British Empire gained their independence, and many became members of

1162-399: A "fuel return" line to send unused fuel back to the tank, which has the benefit of equalizing the fuel's temperature throughout the system, further reducing the chance of vapor lock developing. In addition to vapor locking potential, automotive gasoline does not have the same quality tracking as aviation gasoline. To help solve this problem, the specification for an aviation fuel known as 82UL

1328-502: A 91/96 avgas and have STCs available to run "premium" 91 anti-knock index (AKI) automotive gasoline. Examples include some Cherokees with the 160 hp (120 kW) Lycoming O-320 or 180 hp (130 kW) O-360 , or the Cessna 152 with the O-235 . The AKI rating of typical automotive fuel might not directly correspond to the 91/96 avgas used to certify engines, as motor vehicle pumps in

1494-479: A FAA approved industry replacement by 2018. In July 2021, the first commercially-produced unleaded avgas, GAMI's G100UL , was approved by the Federal Aviation Administration through a Supplemental Type Certificate . Lycoming Engines provides a list of engines and fuels that are compatible with unleaded fuel. However, all of their engines require that an oil additive be used when unleaded fuel

1660-561: A Lycoming O-360-A4M in 2013. The fuel is certified under Lycoming Service Instruction 1070 and ASTM D4814. Unleaded 94 Motor octane fuel ( UL94 ) is essentially 100LL without the lead. In March 2009, Teledyne Continental Motors (TCM) announced they had tested a 94UL fuel that might be the best replacement for 100LL. This 94UL meets the avgas specification including vapor pressure but has not been completely tested for detonation qualities in all Continental engines or under all conditions. Flight testing has been conducted in an IO-550-B powering

1826-535: A checklist of 12 fuel specification parameters and 4 distribution and storage parameters. The FAA has requested a maximum of US$ 60M to fund the administration of the changeover. In July 2014, nine companies and consortiums submitted proposals to the Piston Aviation Fuels Initiative (PAFI) to assess fuels without tetraethyl lead. Phase one testing is performed at the William J. Hughes Technical Center for

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1992-425: A diesel fuel. A higher cetane number indicates that the fuel ignites more readily when sprayed into hot compressed air. European (EN 590 standard) road diesel has a minimum cetane number of 51. Fuels with higher cetane numbers, normally "premium" diesel fuels with additional cleaning agents and some synthetic content, are available in some markets. About 86.1% of diesel fuel mass is carbon, and when burned, it offers

2158-589: A few minutes due to coal dust deposition. Before diesel fuel was standardised, diesel engines typically ran on cheap fuel oils. In the United States, these were distilled from petroleum, whereas in Europe, coal-tar creosote oil was used. Some diesel engines were fuelled with mixtures of fuels, such as petrol, kerosene, rapeseed oil, or lubricating oil which were cheaper because, at the time, they were not being taxed. The introduction of motor-vehicle diesel engines, such as

2324-469: A gel at temperatures of −19 to −15 °C (−2 to 5 °F), that cannot flow in fuel systems. Conventional diesel fuels vaporise at temperatures between 149 °C and 371 °C. Conventional diesel flash points vary between 52 and 96 °C, which makes it safer than petrol and unsuitable for spark-ignition engines. Unlike petrol, the flash point of a diesel fuel has no relation to its performance in an engine nor to its auto ignition qualities. As

2490-491: A good approximation the chemical formula of diesel is C n H 2n . Diesel is a mixture of different molecules. As carbon has a molar mass of 12 g/mol and hydrogen has a molar mass of about 1 g/mol, so the fraction by weight of carbon in EN ;590 diesel fuel is roughly 12/14. The reaction of diesel combustion is given by: 2 C n H 2n + 3n O 2 ⇌ 2n CO 2 + 2n H 2 O Carbon dioxide has

2656-456: A leading role in the movement to abolish slavery worldwide through the blockade of Africa and pressing other nations to end their trade with a series of treaties. In 1800 the parliaments of Great Britain and Ireland each passed an Act of Union, uniting the two kingdoms and creating the United Kingdom of Great Britain and Ireland on 1 January 1801. After the defeat of France at the end of

2822-472: A means of separating the fission product palladium from PUREX raffinate which comes from used nuclear fuel . In this system of solvent extraction, the hydrocarbons of the diesel act as the diluent while the di alkyl sulfides act as the extractant. This extraction operates by a solvation mechanism. So far, neither a pilot plant nor full scale plant has been constructed to recover palladium, rhodium or ruthenium from nuclear wastes created by

2988-615: A molar mass of 44g/mol as it consists of 2 atoms of oxygen (16 g/mol) and 1 atom of carbon (12 g/mol). So 12 g of carbon yield 44 g of Carbon dioxide. Diesel has a density of 0.838 kg per liter. Putting everything together the mass of carbon dioxide that is produced by burning 1 liter of diesel fuel can be calculated as: 0.838 k g / L ⋅ 12 14 ⋅ 44 12 = 2.63 k g / L {\displaystyle 0.838kg/L\cdot {\frac {12}{14}}\cdot {\frac {44}{12}}=2.63kg/L} The figure obtained with this estimation

3154-608: A net heating value of 43.1 MJ/kg as opposed to 43.2 MJ/kg for gasoline. Due to the higher density, diesel fuel offers a higher volumetric energy density: the density of EN 590 diesel fuel is defined as 0.820 to 0.845 kg/L (6.84 to 7.05 lb/US gal) at 15 °C (59 °F), about 9.0-13.9% more than EN 228 gasoline (petrol)'s 0.720–0.775 kg/L (6.01–6.47 lb/US gal) at 15 °C, which should be put into consideration when comparing volumetric fuel prices. The CO 2 emissions from diesel are 73.25 g/MJ, just slightly lower than for gasoline at 73.38 g/MJ. Diesel fuel

3320-769: A policy of splendid isolation in Europe, and attempted to contain Russian influence in Afghanistan and Persia , in what came to be known as the Great Game . During this time, Canada , Australia and New Zealand were granted self-governing dominion status. At the turn of the century, Britain's industrial dominance became challenged by the German Empire and the United States . The Edwardian era saw social reform and home rule for Ireland become important domestic issues, while

3486-752: A quarter of the world's landmass and population, and was the largest empire in history . However, its involvement in the First World War and the Second World War damaged Britain's economic power and a global wave of decolonisation led to the independence of most British colonies. The United Kingdom is a constitutional monarchy and parliamentary democracy . The UK has three distinct jurisdictions: England and Wales , Scotland , and Northern Ireland . Since 1999, Scotland, Wales and Northern Ireland have their own governments and parliaments which control various devolved matters. A developed country ,

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3652-402: A recent transfer to ultra-low-sulfur diesel (ULSD), which causes infrastructural complications. In Sweden, a diesel fuel designated as MK-1 (class 1 environmental diesel) is also being sold. This is a ULSD that also has a lower aromatics content, with a limit of 5%. This fuel is slightly more expensive to produce than regular ULSD. In Germany, the fuel tax on diesel fuel is about 28% lower than

3818-515: A reduced-tax agricultural-only product containing an identifying coloured dye known as red diesel . The official term for white diesel is DERV , standing for diesel-engine road vehicle . In Australia , diesel fuel is also known as distillate (not to be confused with "distillate" in an older sense referring to a different motor fuel), and in Indonesia (as well in Israel ), it is known as Solar ,

3984-504: A result of a shortage of workers in the 1950s, the government encouraged immigration from Commonwealth countries . In the following decades, the UK became a more multi-ethnic society. Despite rising living standards in the late 1950s and 1960s, the UK's economic performance was less successful than many of its main competitors such as France, West Germany and Japan. The UK was the first democratic nation to lower its voting age to 18 in 1969. In

4150-777: A series of connected wars (including the English Civil War ) which led to the temporary overthrow of the monarchy, with the execution of King Charles I , and the establishment of the short-lived unitary republic of the Commonwealth of England , Scotland and Ireland. Although the monarchy was restored , the Interregnum along with the Glorious Revolution of 1688 and the subsequent Bill of Rights 1689 in England and Claim of Right Act 1689 in Scotland ensured that, unlike much of

4316-465: A special oil additive is used. The annual US usage of avgas was 186 million US gallons (700,000 m) in 2008, and was approximately 0.14% of the motor gasoline consumption. From 1983 through 2008, US usage of avgas declined consistently by approximately 7.5 million US gallons (28,000 m) each year. As of 2024, the annual US usage of avgas was 180 million US gallons (680,000 m), most of which contained lead, and 170,000 aircraft in

4482-427: A trademarked name from the country's national petroleum company Pertamina . The term gas oil (French: gazole ) is sometimes also used to refer to diesel fuel. Diesel fuel originated from experiments conducted by German scientist and inventor Rudolf Diesel for his compression-ignition engine which he invented around 1892. Originally, Diesel did not consider using any specific type of fuel. Instead, he claimed that

4648-437: Is C 12 H 23 , ranging approximately from C 10 H 20 to C 15 H 28 . Most diesel fuels freeze at common winter temperatures, while the temperatures greatly vary. Petrodiesel typically freezes around temperatures of −8.1 °C (17.4 °F), whereas biodiesel freezes between temperatures of 2 to 15 °C (36 to 59 °F). The viscosity of diesel noticeably increases as the temperature decreases, changing it into

4814-467: Is acceptable to use on those aircraft and engines that are approved to operate with ... grade UL91 avgas that meets specification D7547." In August 2016, the FAA revised SAIB HQ-16-05 to include similar wording regarding the acceptability of using UL94 in aircraft and engines that are approved to operate with avgas that has a minimum Motor octane rating of 80 or lower, including Grade 80/87. The publication of

4980-446: Is available in some countries for use primarily in agricultural applications, such as fuel for tractors, recreational and utility vehicles or other noncommercial vehicles that do not use public roads . This fuel may have sulfur levels that exceed the limits for road use in some countries (e.g. US). This untaxed diesel is dyed red for identification, and using this untaxed diesel fuel for a typically taxed purpose (such as driving use),

5146-471: Is because diesel engines are more fuel efficient, and diesel fuel is less prone to catching fire. Some of these diesel-powered vehicles (such as the Leopard 1 or MAN 630 ) still ran on petrol, and some military vehicles were still made with otto engines (e. g. Ural-375 or Unimog 404 ), incapable of running on diesel fuel. Today's tractors and heavy equipment are mostly diesel-powered. Among tractors, only

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5312-577: Is close to the values found in the literature. For gasoline, with a density of 0.75 kg/L and a ratio of carbon to hydrogen atoms of about 6 to 14, the estimated value of carbon emission if 1 liter of gasoline is burnt gives: 0.75 k g / L ⋅ 6 ⋅ 12 6 ⋅ 12 + 14 ⋅ 1 ⋅ 44 12 = 2.3 k g / L {\displaystyle 0.75kg/L\cdot {{\frac {6\cdot 12}{6\cdot 12+14}}\cdot 1}\cdot {\frac {44}{12}}=2.3kg/L} In

5478-443: Is dictated by the particular composition of and storage plans for diesel fuels. Each is added at the 5-50 ppm level. The diesel engine is a multifuel engine and can run on a huge variety of fuels. However, development of high-performance, high-speed diesel engines for cars and lorries in the 1930s meant that a proper fuel specifically designed for such engines was needed: diesel fuel. In order to ensure consistent quality, diesel fuel

5644-508: Is formulated to suit the requirements of turbine engines which have no octane requirement and operate over a much wider flight envelope than piston engines. Kerosene is also used by most diesel piston engines developed for aviation use, such as those by SMA Engines , Austro Engine , and Thielert . The main petroleum component used in blending avgas is alkylate , which is a mixture of various isooctanes. Some refineries also use reformate . All grades of avgas that meet CAN 2–3, 25-M82 have

5810-520: Is generally simpler to refine from petroleum than gasoline Additional refining is required to remove sulfur, which contributes to a sometimes higher cost. In many parts of the United States and throughout the United Kingdom and Australia, diesel fuel may be priced higher than petrol per gallon or litre . Reasons for higher-priced diesel include the shutdown of some refineries in the Gulf of Mexico , diversion of mass refining capacity to gasoline production, and

5976-491: Is less volatile, with a Reid vapor pressure range of 5.5 to 7 psi, than automotive gasoline, with a range of 8 to 14 psi. A minimum limit ensures adequate volatility for engine starting. The upper limits are related to atmospheric pressure at sea level, 14.7 psi, for motor vehicles and ambient pressure at 22,000 ft, 6.25 psi, for aircraft. The lower avgas volatility reduces the chance of vapor lock in fuel lines at altitudes up to 22,000 ft. The particular mixtures in use today are

6142-502: Is little need for using diesel fuel in aircraft, and diesel fuel is not commercially used as aviation fuel. Instead, petrol ( Avgas ), and jet fuel (e. g. Jet A-1) are used. However, especially in the 1920s and 1930s, numerous series-production aircraft diesel engines that ran on fuel oils were made, because they had several advantages: their fuel consumption was low, they were reliable, not prone to catching fire, and required minimal maintenance. The introduction of petrol direct injection in

6308-473: Is mainly paraffins with low sulfur and aromatics content. This material is blended often into the above mentions petroleum derived diesel. Biodiesel is obtained from vegetable oil or animal fats (bio lipids ) which are mainly fatty acid methyl esters (FAME), and transesterified with methanol . It can be produced from many types of oils, the most common being rapeseed oil (rapeseed methyl ester, RME) in Europe and soybean oil (soy methyl ester, SME) in

6474-478: Is manufactured to meet ASTM D7547. Many common Lycoming engines are certified to run on this particular grade of Avgas, and Cessna has approved the use of this fuel in a large number of their piston fleet. This fuel is also usable in any aircraft in Europe or the United Kingdom where the engine is certified to use it, whether or not the airframe is certified to do so, too. The firm Airworthy AutoGas tested an ethanol-free 93 anti-knock index (AKI) premium auto gas on

6640-539: Is not a fully viable replacement for avgas in many aircraft, because many high-performance and/or turbocharged airplane engines require 100 octane fuel and modifications are necessary in order to use lower-octane fuel. Many general aviation aircraft engines were designed to run on 80/87 octane, roughly the standard (as unleaded fuel only, with the "{R+M}/2" 87 octane rating) for North American automobiles today. Direct conversions to run on automotive fuel are fairly common, by supplemental type certificate (STC). However,

6806-481: Is only the one specific nominal term 'Great Britain' which invariably excludes Northern Ireland". The BBC historically preferred to use "Britain" as shorthand only for Great Britain, though the present style guide does not take a position except that "Great Britain" excludes Northern Ireland. The adjective "British" is commonly used to refer to matters relating to the United Kingdom and is used in law to refer to United Kingdom citizenship and nationality . People of

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6972-493: Is produced from various sources, the most common being petroleum . Other sources include biomass , animal fat , biogas , natural gas , and coal liquefaction . Petroleum diesel is the most common type of diesel fuel. It is produced by the fractional distillation of crude oil between 200 and 350 °C (392 and 662 °F) at atmospheric pressure , resulting in a mixture of carbon chains that typically contain between 9 and 25 carbon atoms per molecule . This fraction

7138-525: Is ranked 2nd out of 180 countries in the Environmental Performance Index . A law has been passed that UK greenhouse gas emissions will be net zero by 2050. England accounts for 53 per cent of the UK, covering 50,350 square miles (130,395 km ). Most of the country consists of lowland terrain, with upland and mountainous terrain northwest of the Tees–Exe line which roughly divides

7304-416: Is required in their engines, and not unleaded auto fuels: "Current aircraft engines feature valve gear components which are designed for compatibility with the leaded ASTM D910 fuels. In such fuels, the lead acts as a lubricant, coating the contact areas between the valve, guide, and seat. The use of unleaded auto fuels with engines designed for leaded fuels can result in excessive exhaust valve seat wear due to

7470-476: Is similar to the anti-knock index or "pump rating" given to automotive gasoline in the US. The second number indicates the octane rating of the fuel tested to the " aviation rich " standard, which tries to simulate a supercharged condition with a rich mixture, elevated temperatures, and a high manifold pressure. For example, 100/130 avgas has an octane rating of 100 at the lean settings usually used for cruising and 130 at

7636-464: Is sometimes called petrodiesel in some academic circles. Diesel is a high-volume product of oil refineries. In many countries, diesel fuel is standardized. For example, in the European Union, the standard for diesel fuel is EN 590 . Ultra-low-sulfur diesel (ULSD) is a diesel fuel with substantially lowered sulfur contents. As of 2016, almost all of the petroleum-based diesel fuel available in

7802-592: Is sometimes used as a loose synonym for the United Kingdom as a whole. The word England is occasionally used incorrectly to refer to the United Kingdom as a whole, a mistake principally made by people from outside the UK. The term "Britain" is used as a synonym for Great Britain , but also sometimes for the United Kingdom. Usage is mixed: the UK Government prefers to use the term "UK" rather than "Britain" or "British" on its website (except when referring to embassies), while acknowledging that both terms refer to

7968-421: Is standardised; the first standards were introduced after World War II. Typically, a standard defines certain properties of the fuel, such as cetane number , density , flash point , sulphur content, or biodiesel content. Diesel fuel standards include: Diesel fuel Biodiesel fuel The principal measure of diesel fuel quality is its cetane number . A cetane number is a measure of the delay of ignition of

8134-681: Is still in widespread use in certain regions. During development of rocket engines in Germany during World War II J-2 Diesel fuel was used as the fuel component in several engines including the BMW 109-718 . J-2 diesel fuel was also used as a fuel for gas turbine engines. In the United States, petroleum-derived diesel is composed of about 75% saturated hydrocarbons (primarily paraffins including n , iso , and cycloparaffins ), and 25% aromatic hydrocarbons (including naphthalenes and alkylbenzenes ). The average chemical formula for common diesel fuel

8300-414: Is subjected to hydrodesulfurization . Usually such "straight-run" diesel is insufficient in supply and quality, so other sources of diesel fuels are blended in. One major source of additional diesel fuel is obtained by cracking heavier fractions, using visbreaking and coking. This technology converts less useful fractions but the product contains olefins ( alkenes ) which require hydrogenation to give

8466-426: Is susceptible to phase-separation which is very possible due to the altitude/temperature changes light airplanes undergo in ordinary flight. This ethanol-treated fuel can flood the fuel system with water which can cause in-flight engine failure. Additionally, the phase-separated fuel can leave remaining portions that do not meet octane requirements due to the loss of the ethanol in the water-absorption process. Further,

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8632-565: Is the Isle of Wight . Scotland accounts for 32 per cent of the UK, covering 30,410 square miles (78,772 km ). This includes nearly 800 islands , notably the Hebrides , Orkney Islands and Shetland Islands. Scotland is the most mountainous constituent country of the UK, the Highlands to the north and west are the more rugged region containing the majority of Scotland's mountainous land, including

8798-733: Is the highest peak in Wales. Wales has over 1,680 miles (2,704 kilometres) of coastline including the Pembrokeshire Coast . Several islands lie off the Welsh mainland, the largest of which is Anglesey ( Ynys Môn ). Diesel fuel The most common type of diesel fuel is a specific fractional distillate of petroleum fuel oil , but alternatives that are not derived from petroleum, such as biodiesel , biomass to liquid (BTL) or gas to liquid (GTL) diesel are increasingly being developed and adopted. To distinguish these types, petroleum-derived diesel

8964-474: Is thus suited for certain (but not all) diesel engines. Until World War II, several military vehicles, especially those that required high engine performance ( armored fighting vehicles , for example the M26 Pershing or Panther tanks), used conventional otto engines and ran on petrol. Ever since World War II, several military vehicles with diesel engines have been made, capable of running on diesel fuel. This

9130-424: Is used in the UK as a synonym for unmarked road diesel fuel. In India, taxes on diesel fuel are lower than on petrol, as the majority of the transportation for grain and other essential commodities across the country runs on diesel. Taxes on biodiesel in the US vary between states. Some states (Texas, for example) have no tax on biodiesel and a reduced tax on biodiesel blends equivalent to the amount of biodiesel in

9296-481: Is used: "When using the unleaded fuels identified in Table 1, Lycoming oil additive P/N LW-16702, or an equivalent finished product such as Aeroshell 15W-50, must be used." Lycoming also notes that the octane rating of the fuel used must also meet the requirements stated in the fuel specification, otherwise engine damage may occur due to detonation. Prior to 2022, Teledyne Continental Motors (TCM) indicated that leaded avgas

9462-572: The 1884 Reform Act championed by William Gladstone granting suffrage to a majority of males for the first time. The British population increased at a dramatic rate, accompanied by rapid urbanisation , causing significant social and economic stresses. By the late 19th century, the Conservatives under Benjamin Disraeli and Lord Salisbury initiated a period of imperial expansion in Africa , maintained

9628-524: The Atlantic slave trade , mainly between 1662 and 1807 when British or British-colonial slave ships transported nearly 3.3 million slaves from Africa. The slaves were taken to work on plantations , principally in the Caribbean but also North America . However, with pressure from the abolitionism movement , Parliament banned the trade in 1807, banned slavery in the British Empire in 1833, and Britain took

9794-624: The Battle of Culloden in 1746, after which the Scottish Highlanders were forcibly assimilated into Scotland by revoking the feudal independence of clan chiefs . The British colonies in North America that broke away in the American War of Independence became the United States . British imperial ambition turned towards Asia, particularly to India . British merchants played a leading part in

9960-645: The Cairngorms , Loch Lomond and The Trossachs and Ben Nevis which at 1,345 metres (4,413 ft) is the highest point in the British Isles. Wales accounts for less than 9 per cent of the UK, covering 8,020 square miles (20,779 km ). Wales is mostly mountainous, though South Wales is less mountainous than North and mid Wales . The highest mountains in Wales are in Snowdonia and include Snowdon ( Welsh : Yr Wyddfa ) which, at 1,085 metres (3,560 ft),

10126-512: The Commonwealth of Nations . The UK was the third country to develop a nuclear weapons arsenal (with its first atomic bomb test, Operation Hurricane , in 1952), but the post-war limits of Britain's international role were illustrated by the Suez Crisis of 1956. The international spread of the English language ensured the continuing international influence of its literature and culture . As

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10292-675: The European Convention on Human Rights . The UK remained a great power with global diplomatic and military influence and a leading role in the United Nations and NATO . The UK broadly supported the United States' approach to the " war on terror " in the early 21st century. British troops fought in the War in Afghanistan , but controversy surrounded Britain's military deployment in Iraq , which saw

10458-568: The European Union (EU) in 1992, the UK was one of the 12 founding member states. From the late 1960s, Northern Ireland suffered communal and paramilitary violence (sometimes affecting other parts of the UK) conventionally known as the Troubles . It is usually considered to have ended with the 1998 Belfast "Good Friday" Agreement . Following a period of widespread economic slowdown and industrial strife in

10624-486: The Falkland Islands , leading to the 10-week Falklands War in which Argentine forces were defeated. The inhabitants of the islands are predominantly descendants of British settlers, and strongly favour British sovereignty, expressed in a 2013 referendum . From 1984, the UK economy was helped by the inflow of substantial North Sea oil revenues. Another British overseas territory, Gibraltar , ceded to Great Britain in

10790-527: The French Revolutionary Wars and Napoleonic Wars (1792–1815), the United Kingdom emerged as the principal naval and imperial power (with London the largest city in the world from about 1830). Unchallenged at sea , British dominance was later described as Pax Britannica ("British Peace"), a period of relative peace among the great powers (1815–1914) during which the British Empire became

10956-552: The Irish Sea . The United Kingdom had an estimated population of over 68.2 million people in 2023. The capital and largest city of both England and the United Kingdom is London , whose wider metropolitan area is the largest in Western Europe , with a population of 14.9 million. The cities of Edinburgh , Cardiff , and Belfast are the national capitals of Scotland, Wales, and Northern Ireland, respectively. The lands of

11122-630: The Labour Party emerged from an alliance of trade unions and small socialist groups in 1900, and suffragettes campaigned for women's right to vote. Britain was one of the principal Allies that defeated the Central Powers in the First World War (1914–1918). Alongside their French, Russian and (after 1917) American counterparts, British armed forces were engaged across much of the British Empire and in several regions of Europe, particularly on

11288-520: The Mercedes-Benz OM 138 , in the 1930s meant that higher-quality fuels with proper ignition characteristics were needed. At first no improvements were made to motor-vehicle diesel fuel quality. After World War II, the first modern high-quality diesel fuels were standardised. These standards were, for instance, the DIN 51601, VTL 9140–001, and NATO F 54 standards. In 1993, the DIN 51601 was rendered obsolete by

11454-622: The Representation of the People Act 1918 . After the war, Britain became a permanent member of the Executive Council of the League of Nations and received a mandate over a number of former German and Ottoman colonies. Under the leadership of David Lloyd George , the British Empire reached its greatest extent, covering a fifth of the world's land surface and a quarter of its population. By

11620-925: The Soviet Union formed in 1941, leading the Allies against the Axis powers . There were eventual hard-fought victories in the Battle of the Atlantic , the North Africa campaign and the Italian campaign . British forces played important roles in the Normandy landings of 1944 and the liberation of Europe . The British Army led the Burma campaign against Japan, and the British Pacific Fleet fought Japan at sea. British scientists contributed to

11786-464: The Stirling engine , or boilers for steam engines . Diesel is often used in heavy trucks . However, diesel exhaust , especially from older engines, can cause health damage. Diesel fuel has many colloquial names; most commonly, it is simply referred to as diesel . In the United Kingdom, diesel fuel for road use is commonly called diesel or sometimes white diesel if required to differentiate it from

11952-504: The Western Front . The high fatalities of trench warfare caused the loss of much of a generation of men, with lasting social effects in the nation and a great disruption in the social order. Britain had suffered 2.5 million casualties and finished the war with a huge national debt. The consequences of the war persuaded the government to expand the right to vote in national and local elections to all adult men and most adult women with

12118-464: The coastline paradox . It is connected to continental Europe by the Channel Tunnel , which at 31 miles (50 km) (24 miles (38 km) underwater) is the longest underwater tunnel in the world. The UK contains four terrestrial ecoregions: Celtic broadleaf forests , English Lowlands beech forests , North Atlantic moist mixed forests , and Caledonian conifer forests . The area of woodland in

12284-486: The largest protest in British history in opposition to the government led by Tony Blair . The Great Recession severely affected the UK economy. The Cameron–Clegg coalition government of 2010 introduced austerity measures intended to tackle the substantial public deficits. Studies have suggested that policy led to significant social disruption and suffering. A referendum on Scottish independence in 2014 resulted in

12450-610: The 16th century and established the Church of England . Moreover, it defined a national identity for England and slowly, but profoundly, changed people's religious beliefs. Wales was fully incorporated into the Kingdom of England , and Ireland was constituted as a kingdom in personal union with the English crown. In what was to become Northern Ireland, the lands of the independent Catholic Gaelic nobility were confiscated and given to Protestant settlers from England and Scotland. In 1603,

12616-401: The 1713 Treaty of Utrecht, is a key military base . A referendum in 2002 on shared sovereignty with Spain was rejected by 98.97% of voters in the territory. Around the end of the 20th century, there were major changes to the governance of the UK with the establishment of devolved administrations for Scotland, Wales and Northern Ireland. The statutory incorporation followed acceptance of

12782-433: The 1920s through 1940s, running either spark-ignition and low-compression engines, akryod engines, or diesel engines. Thus many farm tractors of the era could burn gasoline, alcohol , kerosene , and any light grade of fuel oil such as heating oil , or tractor vaporising oil , according to whichever was most affordable in a region at any given time. On US farms during this era, the name "distillate" often referred to any of

12948-541: The 1920s through 1950s, are now almost exclusively diesel-powered. Due to its ignition characteristics, diesel fuel is thus widely used in these vehicles. Since diesel fuel is not well-suited for otto engines, passenger cars, which often use otto or otto-derived engines, typically run on petrol instead of diesel fuel. However, especially in Europe and India, many passenger cars have, due to better engine efficiency, diesel engines, and thus run on regular diesel fuel. Diesel displaced coal and fuel oil for steam-powered vehicles in

13114-423: The 1930s outweighed these advantages, and aircraft diesel engines quickly fell out of use. With improvements in power-to-mass ratios of diesel engines, several on-road diesel engines have been converted to and certified for aircraft use since the early 21st century. These engines typically run on Jet A-1 aircraft fuel (but can also run on diesel fuel). Jet A-1 has ignition characteristics similar to diesel fuel, and

13280-510: The 1970s, the Conservative government of the 1980s led by Margaret Thatcher initiated a radical policy of monetarism , deregulation, particularly of the financial sector (for example, the Big Bang in 1986) and labour markets, the sale of state-owned companies (privatisation), and the withdrawal of subsidies to others. In 1982, Argentina invaded the British territories of South Georgia and

13446-679: The 5th century) united with the Picts to create the Kingdom of Scotland in the 9th century. In 1066, the Normans invaded England from northern France. After conquering England , they seized large parts of Wales , conquered much of Ireland and were invited to settle in Scotland, bringing to each country feudalism on the Northern French model and Norman-French culture. The Anglo-Norman ruling class greatly influenced, but eventually assimilated with,

13612-431: The Atlantic. The high octane ratings were traditionally achieved by the addition of tetraethyllead , a highly toxic substance that was phased out of automotive use in most countries in the late 20th century. Leaded avgas is currently available in several grades with differing maximum lead concentrations. (Unleaded avgas is also available.) Because tetraethyllead is a toxic additive, the minimum amount needed to bring

13778-677: The Brittonic area mainly to what was to become Wales , Cornwall and, until the latter stages of the Anglo-Saxon settlement, the Hen Ogledd (northern England and parts of southern Scotland). Most of the region settled by the Anglo-Saxons became unified as the Kingdom of England in the 10th century. Meanwhile, Gaelic speakers in north-west Britain (with connections to the north-east of Ireland and traditionally supposed to have migrated from there in

13944-541: The Cirrus Owners and Pilots Association collectively formed the Clean 100 Octane Coalition to represent them on this issue and push for unleaded 100 octane avgas. In November 2015, UL94 was added as a secondary grade of unleaded aviation gasoline to ASTM D7547, which is the specification that governs UL91 unleaded avgas. UL91 is currently being sold in Europe. UL94 meets all of the same specification property limits as 100LL with

14110-530: The Diesel engine being kerosene ( paraffin ). Diesel experimented with types of lamp oil from various sources, as well as types of petrol and ligroin , which all worked well as Diesel engine fuels. Later, Diesel tested coal tar creosote , paraffin oil, crude oil, gasoline and fuel oil , which eventually worked as well. In Scotland and France, shale oil was used as fuel for the first 1898 production Diesel engines because other fuels were too expensive. In 1900,

14276-584: The French Otto society built a Diesel engine for the use with crude oil, which was exhibited at the 1900 Paris Exposition and the 1911 World's Fair in Paris. The engine actually ran on peanut oil instead of crude oil, and no modifications were necessary for peanut oil operation. During his first Diesel engine tests, Diesel also used illuminating gas as fuel, and managed to build functional designs, both with and without pilot injection. According to Diesel, neither

14442-744: The Manhattan Project whose task was to build an atomic weapon. Once built, it was decided, with British consent, to use the weapon against Japan. The UK was one of the Big Three powers (along with the US and the Soviet Union) who met to plan the post-war world ; it drafted the Declaration by United Nations with the United States and became one of the five permanent members of the United Nations Security Council . It worked closely with

14608-586: The Name of Great Britain". The term "United Kingdom" has occasionally been used as a description for the former Kingdom of Great Britain , although its official name from 1707 to 1800 was simply "Great Britain". The Acts of Union 1800 formed the United Kingdom of Great Britain and Ireland . Following the partition of Ireland and the independence of the Irish Free State in 1922, which left Northern Ireland as

14774-703: The SAIB, especially the August 2016 revision, eliminated the need for many of the UL94 STCs being sold by Swift Fuels, as the majority of the aircraft on the STC's Approved Model List are type-certified to use 80-octane or lower avgas. On April 6, 2017, Lycoming Engines published Service Instruction 1070V, which adds UL94 as an approved grade of fuel for dozens of engine models, 60% of which are carbureted engines. Engines with displacements of 235, 320, 360, and 540 cubic inches make up almost 90% of

14940-644: The Scottish electorate voting by 55.3 to 44.7% to remain part of the United Kingdom. In 2016, 51.9 per cent of voters in the United Kingdom voted to leave the European Union . The UK left the EU in 2020. On 1 May 2021, the EU–UK Trade and Cooperation Agreement came into force. The COVID-19 pandemic had a severe impact on the UK's economy , caused major disruptions to education and had far-reaching impacts on society and politics in 2020 and 2021. The United Kingdom

15106-492: The UK has the world's sixth-largest economy by nominal gross domestic product (GDP). It is a nuclear state , and is ranked fifth globally in military expenditure . The UK has been a permanent member of the UN Security Council since its first session in 1946. It is a member of the Commonwealth of Nations , Council of Europe , G7 , OECD , NATO , Five Eyes , AUKUS and CPTPP . British influence can be observed in

15272-654: The UK have been inhabited continuously since the Neolithic . In AD 43 the Roman conquest of Britain began; the Roman departure was followed by Anglo-Saxon settlement . In 1066, the Normans conquered England . With the end of the Wars of the Roses the English state stabilised and began to grow in power, resulting by the 16th century in the annexation of Wales , the domination of Scotland , and

15438-451: The UK in 1922 as the Irish Free State , and the Royal and Parliamentary Titles Act 1927 created the present United Kingdom. The UK became the first industrialised country and was the world's foremost power for the majority of the 19th and early 20th centuries, particularly during the " Pax Britannica " between 1815 and 1914. At its height in the 1920s, the British Empire encompassed almost

15604-484: The UK in 2023 is estimated to be 3.25 million hectares, which represents 13% of the total land area in the UK. Most of the United Kingdom has a temperate climate, with generally cool temperatures and plentiful rainfall all year round. The temperature varies with the seasons seldom dropping below 0  °C (32  °F ) or rising above 30 °C (86 °F). Some parts, away from the coast, of upland England, Wales, Northern Ireland and most of Scotland, experience

15770-908: The UK into lowland and upland areas. Lowland areas include Cornwall , the New Forest , the South Downs and the Norfolk Broads . Upland areas include the Lake District , the Pennines , the Yorkshire Dales , Exmoor , and Dartmoor . The main rivers and estuaries are the Thames , Severn , and the Humber . England's highest mountain is Scafell Pike , at 978 metres (3,209 ft) in the Lake District; its largest island

15936-483: The UK, diesel is normally stored in a black container to differentiate it from unleaded or leaded petrol, which are stored in green and red containers, respectively. Ethylene-vinyl acetate (EVA) is added to diesel as a "cold flow improver". 50-500 ppm of EVA inhibits crystallization of waxes, which can block fuel filters. Antifoaming agents ( silicones ), antioxidants ( hindered phenols ), and "metal deactivating agents" (salicylaldimines) are other additives. Their use

16102-448: The US use the so-called "(R + M)/2" averaged motor vehicle octane rating system as posted on gas station pumps. Sensitivity is roughly 8–10 points, meaning that a 91 AKI fuel might have a MON of as low as 86. The extensive testing process required to obtain an STC for the engine/airframe combination helps ensure that, for those eligible aircraft, 91 AKI fuel provides sufficient detonation margin under normal conditions. Automotive gasoline

16268-439: The US used leaded avgas. In Europe, avgas remains the most common piston-engine fuel. High prices have encouraged efforts to convert to diesel fuel , which is more readily available, less expensive, and has advantages for aviation use. Grades of avgas are identified by two numbers associated with its Motor Octane Number (MON) . The first number indicates the octane rating of the fuel tested to " aviation lean " standards, which

16434-452: The US. Methanol can also be replaced with ethanol for the transesterification process, which results in the production of ethyl esters. The transesterification processes use catalysts, such as sodium or potassium hydroxide, to convert vegetable oil and methanol into biodiesel and the undesirable byproducts glycerine and water, which will need to be removed from the fuel along with methanol traces. Biodiesel can be used pure (B100) in engines where

16600-402: The United Kingdom and that elsewhere "British government" is used at least as frequently as "United Kingdom government". The UK Permanent Committee on Geographical Names recognises "United Kingdom", "UK" and "U.K." as shortened and abbreviated geopolitical terms for the United Kingdom of Great Britain and Northern Ireland in its toponymic guidelines; it does not list "Britain" but notes that "it

16766-411: The United Kingdom is 1339.7 hours, which is just under 30% of the maximum possible. The hours of sunshine vary from 1200 to about 1580 hours per year, and since 1996 the UK has been and still is receiving above the 1981 to 2010 average hours of sunshine. Climate change has a serious impact on the country. A third of food price rise in 2023 is attributed to climate change. As of 2022, the United Kingdom

16932-436: The United Kingdom use several different terms to describe their national identity and may identify themselves as being British , English , Scottish , Welsh , Northern Irish , or Irish ; or as having a combination of different national identities. Settlement by Cro-Magnons of what was to become the United Kingdom occurred in waves beginning by about 30,000 years ago. The island has been continuously inhabited only since

17098-449: The United Kingdom, mainland Europe, and North America is of a ULSD type. Before diesel fuel had been standardized, the majority of diesel engines typically ran on cheap fuel oils . These fuel oils are still used in watercraft diesel engines. Despite being specifically designed for diesel engines, diesel fuel can also be used as fuel for several non-diesel engines, for example the Akroyd engine ,

17264-605: The United Kingdom. The 1928 Equal Franchise Act gave women electoral equality with men in national elections. Strikes in the mid-1920s culminated in the General Strike of 1926 . Britain had still not recovered from the effects of the First World War when the Great Depression (1929–1932) led to considerable unemployment and hardship in the old industrial areas, as well as political and social unrest with rising membership in communist and socialist parties. A coalition government

17430-626: The United States to establish the IMF , World Bank and NATO . The war left the UK severely weakened and financially dependent on the Marshall Plan , but it was spared the total war that devastated eastern Europe. In the immediate post-war years, the Labour government under Clement Attlee initiated a radical programme of reforms, which significantly impacted British society in the following decades . Major industries and public utilities were nationalised ,

17596-478: The United States. Swift Fuels has an agreement for distribution in Europe. UL94 is not intended to be a full replacement for 100LL, but rather is designed to be a drop-in replacement for aircraft with lower-octane-rated engines, such as those that are approved for operation on Grade 80 avgas (or lower), UL91, or mogas. It is estimated that up to 65% of the fleet of current general aviation piston-engine-powered aircraft can operate on UL94 with no modifications to either

17762-557: The acquisition and settlement of overseas colonies , particularly in North America and the Caribbean. Though previous attempts at uniting the two kingdoms within Great Britain in 1606, 1667, and 1689 had proved unsuccessful, the attempt initiated in 1705 led to the Treaty of Union of 1706 being agreed and ratified by both parliaments. On 1 May 1707, the Kingdom of Great Britain was formed,

17928-413: The aforementioned light fuel oils. Spark ignition engines did not start as well on distillate, so typically a small auxiliary gasoline tank was used for cold starting, and the fuel valves were adjusted several minutes later, after warm-up, to transition to distillate. Engine accessories such as vaporizers and radiator shrouds were also used, both with the aim of capturing heat, because when such an engine

18094-453: The airframe with different engine cowling and exhaust arrangements are applicable for the automotive fuel STC, and even then require fuel-system modifications. Vapor lock typically occurs in fuel systems where a mechanically-driven fuel pump mounted on the engine draws fuel from a tank mounted lower than the pump. The reduced pressure in the line can cause the more volatile components in automotive gasoline to flash into vapor, forming bubbles in

18260-403: The alloys used in aviation engine construction are chosen for their durability and synergistic relationship with the protective features of lead, and engine wear in the valves is a potential problem on automotive gasoline conversions. Fortunately, significant history of engines converted to mogas has shown that very few engine problems are caused by automotive gasoline. A larger problem stems from

18426-456: The aviation industry will be "forced out" of using 100LL in the near future, leaving automotive fuel and jet fuel as the only alternatives. In May 2010, TCM announced that they had licensed development of the SMA SR305 diesel engine. In November 2008, National Air Transportation Association president Jim Coyne indicated that the environmental impact of aviation is expected to be a big issue over

18592-680: The blend, so that B20 fuel is taxed 20% less than pure petrodiesel. Other states, such as North Carolina, tax biodiesel (in any blended configuration) the same as petrodiesel, although they have introduced new incentives to producers and users of all biofuels. Diesel fuel is mostly used in high-speed diesel engines, especially motor-vehicle (e.g. car, lorry) diesel engines, but not all diesel engines run on diesel fuel. For example, large two-stroke watercraft engines typically use heavy fuel oils instead of diesel fuel, and certain types of diesel engines, such as MAN M-System engines, are designed to run on petrol with knock resistances of up to 86 RON. On

18758-697: The decades-long process of European integration , the UK was a founding member of the Western European Union , established with the London and Paris Conferences in 1954. In 1960 the UK was one of the seven founding members of the European Free Trade Association (EFTA), but in 1973 it left to join the European Communities (EC). In a 1975 referendum 67% voted to stay in it. When the EC became

18924-553: The decision to pursue 94UL as a mistake that could cost the aviation industry billions in lost business. Lycoming believes the industry should be pursuing 100UL instead. The Lycoming position is supported by aircraft type clubs representing owners of aircraft that would be unable to run on lower octane fuel. In June 2010, clubs such as the American Bonanza Society, the Malibu Mirage Owners and Pilots Association, and

19090-477: The eastern parts are the driest. Atlantic currents, warmed by the Gulf Stream , bring mild winters, especially in the west where winters are wet and even more so over high ground. Summers are warmest in the southeast of England and coolest in the north. Heavy snowfall can occur in winter and early spring on high ground, and occasionally settles to great depth away from the hills. The average total annual sunshine in

19256-408: The engine or airframe. Some aircraft, however, do require a FAA -approved Supplemental Type Certificate (STC) to be purchased to allow for operation on UL94. UL94 has a minimum Motor octane number (MON, which is the octane rating employed for grading aviation gasoline) of 94.0. 100LL has a minimum MON of 99.6. AKI is the octane rating used to grade all U.S. automotive gasoline (typical values at

19422-483: The establishment of the British Empire . Over the course of the 17th century, the role of the British monarchy was reduced, particularly as a result of the English Civil War . In 1707, the Kingdom of England and the Kingdom of Scotland united under the Treaty of Union to create the Kingdom of Great Britain . The Acts of Union 1800 incorporated the Kingdom of Ireland to create the United Kingdom of Great Britain and Ireland in 1801. Most of Ireland seceded from

19588-529: The ethanol can attack materials in aircraft construction which pre-date "gasahol" fuels. Most of these applicable aircraft have low-compression engines which were originally certified to run on 80/87 avgas and require only "regular" 87 anti-knock index automotive gasoline. Examples include the popular Cessna 172 Skyhawk or Piper Cherokee with the 150 hp (110 kW) variant of the Lycoming O-320 . Some aircraft engines were originally certified using

19754-401: The exception of a lower motor octane number (94.0 minimum for UL94 vs. 99.6 minimum for 100LL) and a decreased maximum lead content. UL94 is an unleaded fuel, but as with all ASTM International unleaded gasoline specifications, a de minimis amount of unintentionally added lead is permitted. Since May 2016, UL94, now a product of Swift Fuels, is available for sale at dozens of airports in

19920-420: The existing alternatives. There are three fundamental issues in using unleaded fuels without serious modification of the airframe/engine: In February 2008, Teledyne Continental Motors (TCM) announced that the company is very concerned about future availability of 100LL, and as a result, they would develop a line of diesel engines . In a February 2008 interview, TCM president Rhett Ross indicated belief that

20086-575: The first year, Britain and its Empire continued the war against Germany. Churchill engaged industry, scientists and engineers to support the government and the military in the prosecution of the war effort. In 1940, the Royal Air Force defeated the German Luftwaffe in the Battle of Britain . Urban areas suffered heavy bombing during the Blitz . The Grand Alliance of Britain, the United States and

20252-519: The formal control it exerted over its own colonies, British dominance of much of world trade meant that it effectively controlled the economies of regions such as East Asia and Latin America . Throughout the Victorian era , political attitudes favoured free trade and laissez-faire policies. Beginning with the Great Reform Act in 1832, Parliament gradually widened the voting franchise , with

20418-569: The fuel from renewable biomass feedstocks, and aims to produce something competitive in price with 100LL and currently available alternative fuels. Swift Fuels has suggested that the fuel, formerly referred to as 100SF, will be available for "high performance piston-powered aircraft" before 2020. John and Mary-Louise Rusek founded Swift Enterprises in 2001 to develop renewable fuels and hydrogen fuel cells. They began testing "Swift 142" in 2006 and patented several alternatives for non-alcohol based fuels which can be derived from biomass fermentation . Over

20584-524: The fuel line and interrupting fuel flow. If an electric boost pump is mounted in the fuel tank to push fuel toward the engine, as is common practice in fuel-injected automobiles, the fuel pressure in the lines is maintained above ambient pressure, preventing bubble formation. Likewise, if the fuel tank is mounted above the engine and fuel flows primarily due to gravity, as in a high-wing airplane, vapor lock cannot occur, using either aviation or automotive fuels. Fuel-injected engines in automobiles also usually have

20750-445: The fuel system can use up to 10% ethanol. Fuel dyes aid ground crew and pilots in identifying and distinguishing the fuel grades and most are specified by ASTM D910 or other standards. Dyes for the fuel are required in some countries. The 100LL phase-out has been called "one of modern GA's most pressing problems", because 70% of 100LL aviation fuel is used by the 30% of the aircraft in the general aviation fleet that cannot use any of

20916-480: The fuel system, ensuring adequate shielding from high temperatures and maintaining sufficient pressure in the fuel lines. This is the main reason why both the specific engine model as well as the aircraft in which it is installed must be supplementally certified for the conversion. A good example of this is the Piper Cherokee with high-compression 160 or 180 hp (120 or 130 kW) engines. Only later versions of

21082-445: The fuel to the required octane rating is used; actual concentrations are often lower than the permissible maximum. Historically, many post-WWII developed, low-powered 4- and 6-cylinder piston aircraft engines were designed to use leaded fuels; an unleaded replacement fuel is being developed and certified for these engines. Some reciprocating-engine aircraft still require leaded fuels, but some do not, and some can burn unleaded gasoline if

21248-685: The global hegemon and adopted the role of global policeman. From 1853 to 1856, Britain took part in the Crimean War , allied with the Ottoman Empire against Tsarist Russia , participating in the naval battles of the Baltic Sea known as the Åland War in the Gulf of Bothnia and the Gulf of Finland , among others. Following the Indian Rebellion in 1857 , the British government led by Lord Palmerston assumed direct rule over India . Alongside

21414-436: The higher and wider range of allowable vapor pressures found in automotive gasoline; this can pose some risk to aviation users if fuel system design considerations are not taken into account. Automotive gasoline can vaporize in fuel lines, causing a vapor lock (a bubble in the line) or fuel pump cavitation, thereby starving the engine of fuel. This does not constitute an insurmountable obstacle, but merely requires examination of

21580-736: The island of Great Britain , the north-eastern part of the island of Ireland , and most of the smaller islands within the British Isles , making up a total area of 94,354 square miles (244,376 km ). Northern Ireland shares a land border with the Republic of Ireland ; otherwise, the United Kingdom is surrounded by the Atlantic Ocean , the North Sea , the English Channel , the Celtic Sea , and

21746-403: The kingdoms of England, Scotland and Ireland were united in a personal union when James VI, King of Scots , inherited the crowns of England and Ireland and moved his court from Edinburgh to London; each country nevertheless remained a separate political entity and retained its separate political, legal, and religious institutions. In the mid-17th century, all three kingdoms were involved in

21912-554: The lack of lead with cylinder performance deteriorating to unacceptable levels in under 10 hours." In 2022, TCM changed its policy. They have announced a formal application to the FAA to approve the use of UL91 and UL94 in selected engines, stating that "Continental considers 91UL and 94UL fuel as a transitional step in a long-term strategy to reach a more sustainable aviation". Hjelmco Oil first introduced unleaded Avgas grades in Europe in 2003, after its success with 80UL. This grade of Avgas

22078-408: The last retreat of the ice around 11,500 years ago. By the end of the region's prehistoric period , the population is thought to have belonged largely to a culture termed Insular Celtic , comprising Brittonic Britain and Gaelic Ireland . The Roman conquest , beginning in 43 AD, and the 400-year rule of southern Britain , was followed by an invasion by Germanic Anglo-Saxon settlers, reducing

22244-425: The latter half of the 20th century, and is now used almost exclusively for the combustion engines of self-powered rail vehicles (locomotives and railcars). In general, diesel engines are not well-suited for planes and helicopters. This is because of the diesel engine's comparatively low power-to-mass ratio , meaning that diesel engines are typically rather heavy, which is a disadvantage in aircraft. Therefore, there

22410-409: The legal and political systems of many of its former colonies , and British culture remains globally influential, particularly in language , literature , music and sport . English is the world's most widely spoken language and the third-most spoken native language . The Acts of Union 1707 declared that the Kingdom of England and Kingdom of Scotland were "United into One Kingdom by

22576-524: The local cultures. Subsequent medieval English kings completed the conquest of Wales and tried unsuccessfully to annex Scotland . Asserting its independence in the 1320 Declaration of Arbroath , Scotland maintained its independence thereafter, albeit in near-constant conflict with England . In 1215 the Magna Carta was the first document to state that no government was above the law, that citizens have rights protecting them and that they were entitled to

22742-655: The lower-powered (100–150 horsepower or 75–112 kilowatts) aviation engines that were developed in the late 1990s are designed to run on unleaded fuel and on 100LL, an example being the Rotax 912 . Automotive gasoline  – known as mogas or autogas among aviators – that does not contain ethanol may be used in certified aircraft that have a Supplemental Type Certificate (STC) for automotive gasoline, as well as in experimental aircraft and ultralight aircraft . Some oxygenates other than ethanol are approved, but these STC's prohibit ethanol-laced gasolines. Ethanol-treated gasoline

22908-600: The major part of the British Isles archipelago and includes the island of Great Britain, the north-eastern one-sixth of the island of Ireland and some smaller surrounding islands. It lies between the North Atlantic Ocean and the North Sea with the southeast coast coming within 22 miles (35 km) of the coast of northern France, from which it is separated by the English Channel . The Royal Greenwich Observatory in London

23074-485: The manufacturer approves such use, but it is more often used as a mix with diesel, BXX where XX is the biodiesel content in percent. FAME used as fuel is specified in DIN EN 14214 and ASTM D6751 standards. In the US, diesel is recommended to be stored in a yellow container to differentiate it from kerosene , which is typically kept in blue containers, and gasoline (petrol), which is typically kept in red containers. In

23240-669: The mid-1920s, most of the British population could listen to BBC radio programmes. Experimental television broadcasts began in 1929 and the first scheduled BBC Television Service commenced in 1936. The rise of Irish nationalism , and disputes within Ireland over the terms of Irish Home Rule , led eventually to the partition of the island in 1921. A period of conflict in what is now Northern Ireland occurred from June 1920 until June 1922. The Irish Free State became independent, initially with Dominion status in 1922, and unambiguously independent in 1931 . Northern Ireland remained part of

23406-454: The models approved for UL94. Swift Fuels, LLC, has attained approval to produce fuel for testing at its pilot plant in Indiana. Composed of approximately 85% mesitylene and 15% isopentane , the fuel is reportedly scheduled for extensive testing by the FAA to receive certification under the new ASTM D7719 guideline for unleaded 100LL replacement fuels. The company eventually intends to produce

23572-443: The new EN 590 standard, which has been used in the European Union ever since. In sea-going watercraft, where diesel propulsion had gained prevalence by the late 1970s due to increasing fuel costs caused by the 1970s energy crisis , cheap heavy fuel oils are still used instead of conventional motor-vehicle diesel fuel. These heavy fuel oils (often called Bunker C ) can be used in diesel-powered and steam-powered vessels. Diesel fuel

23738-544: The next few years and will result in the phasing out of 100LL because of its lead content. By May 2012, the US Federal Aviation Administration (FAA Unleaded Avgas Transition rulemaking committee) had put together a plan in conjunction with industry to replace leaded avgas with an unleaded alternative within 11 years. Given the progress already made on 100SF and G100UL, the replacement time might be shorter than that 2023 estimate. Each candidate fuel must meet

23904-538: The next several years, the company sought to build a pilot plant to produce enough fuel for larger-scale testing and submitted fuel to the FAA for testing. United Kingdom The United Kingdom of Great Britain and Northern Ireland , commonly known as the United Kingdom ( UK ) or Britain , is a country in Northwestern Europe , off the coast of the continental mainland . It comprises England , Scotland , Wales , and Northern Ireland . The UK includes

24070-463: The only part of the island of Ireland within the United Kingdom, the name was changed in 1927 to the "United Kingdom of Great Britain and Northern Ireland". Although the United Kingdom is a sovereign country, England, Scotland, Wales and Northern Ireland are also widely referred to as countries . The UK Prime Minister's website has used the phrase "countries within a country" to describe the United Kingdom. Some statistical summaries, such as those for

24236-406: The operating principle of his rational heat motor would work with any kind of fuel in any state of matter. The first diesel engine prototype and the first functional Diesel engine were only designed for liquid fuels. At first, Diesel tested crude oil from Pechelbronn , but soon replaced it with petrol and kerosene , because crude oil proved to be too viscous, with the main testing fuel for

24402-598: The other hand, gas turbine and some other types of internal combustion engines, and external combustion engines , can also be designed to take diesel fuel. The viscosity requirement of diesel fuel is usually specified at 40 °C. A disadvantage of diesel fuel in cold climates is that its viscosity increases as the temperature decreases, changing it into a gel (see Compression Ignition – Gelling ) that cannot flow in fuel systems. Special low-temperature diesel contains additives to keep it liquid at lower temperatures. Trucks and buses , which were often otto-powered in

24568-414: The past, diesel fuel contained higher quantities of sulfur . European emission standards and preferential taxation have forced oil refineries to dramatically reduce the level of sulfur in diesel fuels. In the European Union, the sulfur content has dramatically reduced during the last 20 years. Automotive diesel fuel is covered in the European Union by standard EN 590 . In the 1990s specifications allowed

24734-421: The petrol fuel tax. Diesel fuel is similar to heating oil , which is used in central heating . In Europe, the United States, and Canada, taxes on diesel fuel are higher than on heating oil due to the fuel tax , and in those areas, heating oil is marked with fuel dyes and trace chemicals to prevent and detect tax fraud . "Untaxed" diesel (sometimes called "off-road diesel" or "red diesel" due to its red dye)

24900-466: The pump can include 87, 89, 91, and 93), and also the 93UL fuel from Airworthy AutoGas. The minimum AKI of UL94, as sold by Swift Fuels, is 98.0. Concurrent with the addition of UL94 to ASTM D7547, the FAA published Special Airworthiness Information Bulletin (SAIB) HQ-16-05, which states that "UL94 meets the operating limitations or aircraft and engines approved to operate with grade UL91 avgas," meaning that "Grade UL94 avgas that meets specification D7547

25066-497: The rest of Europe, royal absolutism would not prevail, and a professed Catholic could never accede to the throne. The British constitution would develop on the basis of constitutional monarchy and the parliamentary system . With the founding of the Royal Society in 1660, science was greatly encouraged. During this period, particularly in England, the development of naval power and the interest in voyages of discovery led to

25232-568: The result of the Acts of Union 1707 between the Kingdom of England and Kingdom of Scotland . In the 18th century, cabinet government developed under Robert Walpole , in practice the first prime minister (1721–1742). A series of Jacobite uprisings sought to remove the Protestant House of Hanover from the throne and restore the Catholic House of Stuart . The Jacobites were finally defeated at

25398-424: The rich settings used for take-off and other full-power conditions. Antiknock agents such as tetraethyl lead (TEL) help to control detonation and provide lubrication. One gram of TEL contains 640.6 milligrams of lead . ("avgas 100") ("avgas 100LL") ("avgas 115") 100LL (pronounced "one hundred low lead") may contain a maximum of one-half the tetraethyllead allowed in 100/130 (green) avgas. Some of

25564-502: The same as when they were first developed in the 1940s, and were used in airline and military aero engines with high levels of supercharging ; notably the Rolls-Royce Merlin engine used in the Spitfire and Hurricane fighters, Mosquito fighter-bomber and Lancaster heavy bomber (the Merlin II and later versions required 100-octane fuel), as well as the liquid-cooled Allison V-1710 engine, and air-cooled radial engines from Pratt & Whitney, Wright, and other manufacturers on both sides of

25730-446: The saturated hydrocarbons as desired. Another refinery stream that contributes to diesel fuel is hydrocracking . Finally, kerosene is added to modify its viscosity. Synthetic diesel can be produced from many carbonaceous precursors but natural gas is most important. Raw materials are converted to synthesis gas which by the Fischer–Tropsch process is converted to a synthetic diesel. Synthetic diesel produced in this way generally

25896-461: The smaller classes may also offer gasoline-fuelled engines. The dieselization of tractors and heavy equipment began in Germany before World War II but was unusual in the United States until after that war. During the 1950s and 1960s, it progressed in the US as well. Diesel fuel is commonly used in oil and gas extracting equipment, although some locales use electric or natural gas powered equipment. Tractors and heavy equipment were often multifuel in

26062-436: The twelve NUTS 1 regions , refer to Scotland, Wales and Northern Ireland as "regions". Northern Ireland is also referred to as a "province". With regard to Northern Ireland, the descriptive name used "can be controversial, with the choice often revealing one's political preferences". The term "Great Britain" conventionally refers to the island of Great Britain, or politically to England, Scotland and Wales in combination. It

26228-403: The use of catalytic converters for pollution reduction, the most commonly used grades of avgas still contain tetraethyl lead , a toxic lead containing additive used to aid in lubrication of the engine, increase octane rating , and prevent engine knocking (premature detonation). There are ongoing efforts to reduce or eliminate the use of lead in aviation gasoline. Kerosene -based jet fuel

26394-509: The use of nuclear fuel . Diesel fuel is often used as the main ingredient in oil-base mud drilling fluid. The advantage of using diesel is its low cost and its ability to drill a wide variety of difficult strata, including shale, salt and gypsum formations. Diesel-oil mud is typically mixed with up to 40% brine water. Due to health, safety and environmental concerns, Diesel-oil mud is often replaced with vegetable, mineral, or synthetic food-grade oil-base drilling fluids, although diesel-oil mud

26560-452: The user can be fined (e.g. US$ 10,000 in the US). In the United Kingdom, Belgium and the Netherlands, it is known as red diesel (or gas oil), and is also used in agricultural vehicles, home heating tanks, refrigeration units on vans/trucks which contain perishable items such as food and medicine and for marine craft. Diesel fuel, or marked gas oil is dyed green in the Republic of Ireland and Norway. The term "diesel-engined road vehicle" (DERV)

26726-433: Was a coal-dust–producing industry existent, nor was fine, high-quality coal-dust commercially available in the late 1890s. This is the reason why the Diesel engine was never designed or planned as a coal-dust engine. Only in December 1899, did Diesel test a coal-dust prototype, which used external mixture formation and liquid fuel pilot injection. This engine proved to be functional, but suffered from piston ring failure after

26892-416: Was chosen as the defining point of the Prime Meridian at the International Meridian Conference in 1884. The United Kingdom lies between latitudes 49° and 61° N , and longitudes 9° W and 2° E . Northern Ireland shares a 224-mile (360 km) land boundary with the Republic of Ireland. The coastline of Great Britain is 11,073 miles (17,820 km) long, though measurements can vary greatly due to

27058-399: Was developed as essentially automotive gasoline with additional quality tracking and restrictions on permissible additives. This fuel is not currently in production and no refiners have committed to producing it. Rotax allows up to 10% ethanol (similar to E10 fuel for cars) in the fuel for Rotax 912 engines. Light sport aircraft that are specified by the manufacturer to tolerate alcohol in

27224-404: Was formed in 1931. Nonetheless, "Britain was a very wealthy country, formidable in arms, ruthless in pursuit of its interests and sitting at the heart of a global production system." After Nazi Germany invaded Poland in 1939, Britain entered the Second World War . Winston Churchill became prime minister and head of a coalition government in 1940. Despite the defeat of its European allies in

27390-494: Was run on distillate, it ran better when both it and the air it inhaled were warmer rather than at ambient temperature. Dieselization with dedicated diesel engines (high-compression with mechanical fuel injection and compression ignition) replaced such systems and made more efficient use of the diesel fuel being burned. Poor quality diesel fuel has been used as an extraction agent for liquid–liquid extraction of palladium from nitric acid mixtures. Such use has been proposed as

27556-432: Was the first country in the world to use an approved COVID-19 vaccine , developing its own vaccine through a collaboration between Oxford University and AstraZeneca , which allowed the UK's vaccine rollout to be among the fastest in the world. The total area of the United Kingdom is approximately 94,354 square miles (244,376 km ), with a land area of 93,723 square miles (242,741 km ). The country occupies

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