98-530: The Handley Page HP.137 Jetstream is a small twin- turboprop airliner , with a pressurised fuselage . The aircraft was designed to meet the requirements of the United States commuter and regional airline market. The design was later improved and built by British Aerospace as the BAe Jetstream 31 and BAe Jetstream 32 , featuring different turboprop engines. Handley Page was in an awkward position in
196-670: A Private Finance Initiative with newly purchased Sikorsky S-92 and AgustaWestland AW189 aircraft. The new contract means that all UK SAR coverage is now provided by Bristow aircraft. In 2018, the RAF's vision of a future constellation of imagery satellites was initiated through the launch of the Carbonite-2 technology demonstrator. The 100 kg Carbonite-2 uses commercial off-the-shelf (COTS) components to deliver high-quality imagery and 3D video footage from space. The Royal Air Force celebrated its 100th anniversary on 1 April 2018. It marked
294-629: A wing commander and, for a fast-jet squadron, have an complement of around twelve aircraft. Independent flights are so designated because they are explicitly smaller in size than a squadron. Many independent flights are, or have been, front-line flying units. For example, No. 1435 Flight carries out air defence duties for the Falkland Islands , with four Eurofighter Typhoon fighters based at RAF Mount Pleasant . Support capabilities are provided by several specialist wings and other units. Command, control, and support for overseas operations
392-592: A commuter airline based at the Santa Barbara Airport in California , appeared in the 1979 film " Moonraker " starring Roger Moore where British secret agent James Bond ( 007 ) is thrown out of the aircraft while it is in flight. Data from Jane's All The World's Aircraft 1976–77. General characteristics Performance Related development Aircraft of comparable role, configuration, and era Related lists Turboprop A turboprop
490-406: A constant-speed propeller increase their pitch as aircraft speed increases. Another benefit of this type of propeller is that it can also be used to generate reverse thrust to reduce stopping distance on the runway. Additionally, in the event of an engine failure, the propeller can be feathered , thus minimizing the drag of the non-functioning propeller. While the power turbine may be integral with
588-416: A large amount of air by a small degree than a small amount of air by a large degree, a low disc loading (thrust per unit disc area) increases the aircraft's energy efficiency , and this reduces the fuel use. Propellers work well until the flight speed of the aircraft is high enough that the airflow past the blade tips reaches the speed of sound. Beyond that speed, the proportion of the power that drives
686-626: A minor role in the Korean War , with flying boats taking part. From 1953 to 1956 the RAF Avro Lincoln squadrons carried out anti- Mau Mau operations in Kenya using its base at RAF Eastleigh . The Suez Crisis in 1956 saw a large RAF role, with aircraft operating from RAF Akrotiri and RAF Nicosia on Cyprus and RAF Luqa and RAF Hal Far on Malta as part of Operation Musketeer . The RAF suffered its most recent loss to an enemy aircraft during
784-600: A quarter of Bomber Command's personnel were Canadian. Additionally, the Royal Australian Air Force represented around nine per cent of all RAF personnel who served in the European and Mediterranean theatres. During the Battle of Britain in 1940, the RAF defended the skies over Britain against the numerically superior German Luftwaffe . In what is perhaps the most prolonged and complicated air campaign in history,
882-575: A single Hawker Tempest F.6 in January 1949. Before Britain developed its own nuclear weapons , the RAF was provided with American nuclear weapons under Project E . However, following the development of its own arsenal, the British Government elected on 16 February 1960 to share the country's nuclear deterrent between the RAF and submarines of the Royal Navy, first deciding to concentrate solely on
980-612: A support enabler role. A Control and Reporting Centre (CRC) at RAF Boulmer is tasked with compiling a Recognised Air Picture of UK air space and providing tactical control of the Quick Reaction Alert Force . In order to achieve this Boulmer is supported by a network of eight Remote Radar Heads (RRHs) spread the length of the UK. The UK operates permanent military airfields (known as Permanent Joint Operating Bases) in four British Overseas Territories . These bases contribute to
1078-575: A test-bed not intended for production. It first flew on 20 September 1945. From their experience with the Trent, Rolls-Royce developed the Rolls-Royce Clyde , the first turboprop engine to receive a type certificate for military and civil use, and the Dart , which became one of the most reliable turboprop engines ever built. Dart production continued for more than fifty years. The Dart-powered Vickers Viscount
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#17328522876951176-483: A war that remained under low profile. The Konfrontasi against Indonesia in the early 1960s did see use of RAF aircraft, but due to a combination of deft diplomacy and selective ignoring of certain events by both sides, it never developed into a full-scale war. The RAF played a large role in the Aden Emergency between 1963 and 1967. Hawker Hunter FGA.9s based at RAF Khormaksar , Aden , were regularly called in by
1274-429: Is a turbine engine that drives an aircraft propeller . A turboprop consists of an intake , reduction gearbox , compressor , combustor , turbine , and a propelling nozzle . Air enters the intake and is compressed by the compressor. Fuel is then added to the compressed air in the combustor, where the fuel-air mixture then combusts . The hot combustion gases expand through the turbine stages, generating power at
1372-948: Is also responsible for the RAF Medical Services, RAF Support Force, consisting of the RAF's engineering, logistics, intelligence, signals, musical and mountain rescue assets, RAF's Combat and Readiness Force, comprising the RAF Regiment , and the Air Security Force, comprising RAF Police . It oversees stations at RAF Benson and RAF Brize Norton in Oxfordshire, RAF Henlow in Bedfordshire, RAF Honington in Suffolk, RAF Odiham in Hampshire and RAF Northolt in West London. No. 11 Group
1470-494: Is at RAF High Wycombe co-located with Air Command. Groups are the subdivisions of operational commands and are responsible for certain types of capabilities or for operations in limited geographical areas. There are five groups subordinate to Air Command, of which four are functional and one is geographically focused: No. 1 Group is responsible for combat aircraft (comprising the Lightning Force and Typhoon Force) and
1568-482: Is normally a constant-speed (variable pitch) propeller type similar to that used with larger aircraft reciprocating engines , except that the propeller-control requirements are very different. Due to the turbine engine's slow response to power inputs, particularly at low speeds, the propeller has a greater range of selected travel in order to make rapid thrust changes, notably for taxi, reverse, and other ground operations. The propeller has 2 modes, Alpha and Beta. Alpha
1666-776: Is part of the Ministry of Defence and body legally responsible for the defence of the United Kingdom and its overseas territories . The Chief of the Air Staff chairs the Air Force Board Standing Committee (AFBSC) which decides on the policy and actions required for the RAF to meet the requirements of the Defence Council and His Majesty's Government . The Chief of the Air Staff is supported by several other senior commanders: Administrative and operational command of
1764-629: Is responsible for integrating operations across the air , cyber and space domains whilst responding to new and evolving threats. It includes the RAF's Battlespace Management Force which controls the UK Air Surveillance and Control System (ASACS). The group oversees stations at RAF Boulmer in Northumberland, RAF Fylingdales in North Yorkshire and RAF Spadeadam in Cumbria. No. 22 Group
1862-698: Is responsible for the supply of qualified and skilled personnel to the RAF and provides flying and non-flying training to all three British armed services. It is the end-user of the UK Military Flying Training System which is provided by civilian contractor Ascent Flight Training . The group oversees stations at RAF College Cranwell in Lincolnshire, RAF Cosford and RAF Shawbury in Shropshire, RAF Halton in Buckinghamshire, MOD St Athan in
1960-494: Is sacrificed in favor of shaft power, which is obtained by extracting additional power (beyond that necessary to drive the compressor) from turbine expansion. Owing to the additional expansion in the turbine system, the residual energy in the exhaust jet is low. Consequently, the exhaust jet produces about 10% of the total thrust. A higher proportion of the thrust comes from the propeller at low speeds and less at higher speeds. Turboprops have bypass ratios of 50–100, although
2058-577: Is second to none, and that makes a decisive air power contribution in support of the UK Defence Mission". The mission statement is supported by the RAF's definition of air power , which guides its strategy. Air power is defined as "the ability to project power from the air and space to influence the behaviour of people or the course of events". Today, the Royal Air Force maintains an operational fleet of various types of aircraft, described by
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#17328522876952156-404: Is the mode for all flight operations including takeoff. Beta, a mode typically consisting of zero to negative thrust, is used for all ground operations aside from takeoff. The Beta mode is further broken down into 2 additional modes, Beta for taxi and Beta plus power. Beta for taxi as the name implies is used for taxi operations and consists of all pitch ranges from the lowest alpha range pitch, all
2254-588: Is to support the objectives of the British Ministry of Defence (MOD), which are to "provide the capabilities needed to ensure the security and defence of the United Kingdom and overseas territories, including against terrorism; to support the Government's foreign policy objectives particularly in promoting international peace and security". The RAF describes its mission statement as "... [to provide] an agile, adaptable and capable Air Force that, person for person,
2352-517: Is typically provided through Expeditionary Air Wings (EAWs). Each wing is brought together as and when required and comprises the deployable elements of its home station as well as other support elements from throughout the RAF. Several Expeditionary Air Wings are based overseas: The RAF Schools consist of the squadrons and support apparatus that train new aircrew to join front-line squadrons. The schools separate individual streams, but group together units with similar responsibility or that operate
2450-623: The 1948 Arab–Israeli War : during the withdrawal of the former Mandatory Palestine in May 1948 where British Supermarine Spitfire FR.18s shot down four Royal Egyptian Air Force Spitfire LF.9s after the REAF mistakenly attacked RAF Ramat David airbase; and during encounters with the Israeli Air Force which saw the loss of a single de Havilland Mosquito PR.34 in November 1948 and four Spitfire FR.18s and
2548-545: The Beechcraft King Air , Aero Commander Turbo Commander and Swearingen Merlin it offered "more capacity, better range-payload, higher speed and greater comfort". American salesman and modification engineer Jack Riley claimed to have written the design specifications. The design garnered intense interest in the US when it was first introduced, and an order for 20 had been placed even before the drawings were complete. Charles Joy
2646-633: The British Army as close air support to carry out strikes on rebel positions. The Radfan Campaign (Operation Nutcracker) in early 1964 was successful in suppressing the revolt in Radfa, however it did nothing to end the insurgency with the British withdrawing from Aden in November 1967. One of the largest actions undertaken by the RAF during the Cold War was the air campaign during the 1982 Falklands War , in which
2744-625: The British Empire , including establishing bases to protect Singapore and Malaya. The RAF's naval aviation branch, the Fleet Air Arm , was founded in 1924 but handed over to Admiralty control on 24 May 1939. The RAF adopted the doctrine of strategic bombing , which led to the construction of long-range bombers and became its main bombing strategy in the Second World War . The Royal Air Force underwent rapid expansion prior to and during
2842-562: The Central Powers in 1918, the RAF emerged as the largest air force in the world at the time. Since its formation, the RAF has played a significant role in British military history . In particular, during the Second World War , the RAF established air superiority over Nazi Germany 's Luftwaffe during the Battle of Britain , and led the Allied strategic bombing effort. The RAF's mission
2940-589: The Jetstream 200 . In February 1972, 26 Jetstream 201s were ordered by the Royal Air Force , which used them as multi-engine trainers as the Jetstream T.1 . Fourteen of these were modified as observer trainers for the Royal Navy , receiving the designation Jetstream T2 . The aircraft was used mainly by corporate operators and scheduled passenger commuter/regional airlines. A Jetstream operated by Apollo Airways,
3038-661: The London Eye , the RAF Memorial and (at 13.00) the Ministry of Defence building . Four major defence reviews have been conducted since the end of the Cold War: the 1990 Options for Change , the 1998 Strategic Defence Review , the 2003 Delivering Security in a Changing World and the 2010 Strategic Defence and Security Review (SDSR). All four defence reviews have resulted in steady reductions in manpower and numbers of aircraft, especially combat aircraft such as fast-jets. As part of
Handley Page Jetstream - Misplaced Pages Continue
3136-616: The P-3 Orion , and the C-130 Hercules military transport aircraft. The first turbine-powered, shaft-driven helicopter was the Kaman K-225 , a development of Charles Kaman 's K-125 synchropter , which used a Boeing T50 turboshaft engine to power it on 11 December 1951. December 1963 saw the first delivery of Pratt & Whitney Canada's PT6 turboprop engine for the then Beechcraft 87, soon to become Beechcraft King Air . 1964 saw
3234-830: The Piper Meridian , Socata TBM , Pilatus PC-12 , Piaggio P.180 Avanti , Beechcraft King Air and Super King Air . In April 2017, there were 14,311 business turboprops in the worldwide fleet. Between 2012 and 2016, the ATSB observed 417 events with turboprop aircraft, 83 per year, over 1.4 million flight hours: 2.2 per 10,000 hours. Three were "high risk" involving engine malfunction and unplanned landing in single‑engine Cessna 208 Caravans , four "medium risk" and 96% "low risk". Two occurrences resulted in minor injuries due to engine malfunction and terrain collision in agricultural aircraft and five accidents involved aerial work: four in agriculture and one in an air ambulance . Jane's All
3332-638: The Royal Naval Air Service (RNAS). This was done as recommended in a report prepared by the South African statesman and general Jan Smuts . At that time it was the largest air force in the world. Its headquarters was located in the former Hotel Cecil . After the war, the RAF was drastically cut and its inter-war years were relatively quiet. The RAF was put in charge of British military activity in Iraq , and carried out minor activities in other parts of
3430-652: The Royal Navy 's Fleet Air Arm and the British Army 's Army Air Corps also operate armed aircraft. The Royal Air Force was formed towards the end of the First World War on 1 April 1918, becoming the third independent air force in the world after the Mexican Air Force (established 5 February 1915) and the Finnish Air Force (established 6 March 1918), by merging the Royal Flying Corps (RFC) and
3528-590: The Tupolev Tu-114 can reach 470 kn (870 km/h; 540 mph). Large military aircraft , like the Tupolev Tu-95 , and civil aircraft , such as the Lockheed L-188 Electra , were also turboprop powered. The Airbus A400M is powered by four Europrop TP400 engines, which are the second most powerful turboprop engines ever produced, after the 11 MW (15,000 hp) Kuznetsov NK-12 . In 2017,
3626-417: The UK Military Flying Training System which is dedicated to training aircrew for all three UK armed services. Specialist ground crew training is focused at RAF Cosford , RAF St Mawgan and MOD St. Athan . Operations are supported by numerous other flying and non-flying stations, with activity focussed at RAF Honington which coordinates Force Protection and RAF Leeming & RAF Wittering which have
3724-629: The United States Air Force to consider it for cargo use. It eventually placed an order for 11, fitted with a cargo door and accommodation for 12 passengers or six stretcher cases, to be known as the C-10A, or Jetstream 3M . The US Air Force cancelled its order in October 1969 citing late delivery. The first production model Jetstream 1 flew on 6 December 1968, and over the next year 36 would be delivered. However, by this point Handley Page had given up on
3822-544: The United States Air Force , the RAF formed its own RPAS squadron in 2007 when No. 39 Squadron was stood up as a General Atomics MQ-9A Reaper unit at Creech AFB , Nevada. The RAF's 90th anniversary was commemorated on 1 April 2008 by a flypast of the RAF's Aerobatic Display Team the Red Arrows and four Eurofighter Typhoons along the River Thames , in a straight line from just south of London City Airport Tower Bridge,
3920-721: The Westland Puma HC2 for search and rescue. No. 230 Squadron , based at Medicina Lines , Brunei, also operate the Puma HC2. A flying squadron is an aircraft unit which carries out the primary tasks of the RAF. RAF squadrons are somewhat analogous to the regiments of the British Army in that they have histories and traditions going back to their formation, regardless of where they are based or which aircraft they are operating. They can be awarded standards and battle honours for meritorious service. Most flying squadrons are commanded by
4018-517: The 1960s, wishing to remain independent of the "big two" British companies ( Hawker Siddeley and the British Aircraft Corporation ), but without the money needed to develop a large new airliner that would keep it in the market. After studying the market it decided that its next product would be a highly competitive small airliner instead, filling a niche it identified for a 12–18 seat high-speed design. Compared to its three closest rivals,
Handley Page Jetstream - Misplaced Pages Continue
4116-679: The 1991 Gulf War , the 1999 Kosovo War , the 2001 War in Afghanistan , the 2003 invasion and war in Iraq , the 2011 intervention in Libya and from 2014 onwards has been involved in the war against the Islamic State . The RAF began conducting Remotely-piloted Air System (RPAS) operations in 2004, with No. 1115 Flight carrying out missions in Afghanistan and Iraq with the General Atomics MQ-1 Predator . Initially embedded with
4214-539: The Battle of Britain contributed significantly to the delay and subsequent indefinite postponement of Operation Sea Lion , Hitler's plans for an invasion of the UK. In the House of Commons on 20 August, prompted by the ongoing efforts of the RAF, Prime Minister Winston Churchill made a speech to the nation, where he said " Never in the field of human conflict was so much owed by so many to so few" . The largest RAF effort during
4312-504: The Berlin Blockade take place. As part of Operation Pitting , the RAF helped evacuate over 15,000 people in two weeks. Between April and May 2023, the RAF helped evacuate over 2,300 people from Sudan due to the 2023 Sudan conflict as part of Operation Polarbear . In April 2024, Typhoon FGR4s operating from RAF Akrotiri, Cyprus, engaged and destroyed Iranian drones over Iraqi and Syrian airspace during Iran's strikes against Israel . The professional head and highest-ranking officer of
4410-507: The Houses of Parliament, Conservative MP and Minister of State for the Armed Forces , Andrew Robathan , announced that the RAF's QRA force had been scrambled almost thirty times in the last three years: eleven times during 2010, ten times during 2011 and eight times during 2012. RAF Coningsby in Lincolnshire and RAF Lossiemouth in Moray both provide QRA aircraft, and scramble their Typhoons within minutes to meet or intercept aircraft which give cause for concern. Lossiemouth generally covers
4508-421: The RAF as being "leading-edge" in terms of technology. This largely consists of fixed-wing aircraft, including those in the following roles: fighter and strike , airborne early warning and control , intelligence, surveillance, target acquisition, and reconnaissance (ISTAR), signals intelligence (SIGINT), maritime patrol, air-to-air refueling (AAR) and strategic & tactical transport . The majority of
4606-508: The RAF is delegated by the Air Force Board to Headquarters Air Command , based at RAF High Wycombe in Buckinghamshire . Air Command was formed on 1 April 2007 by combining RAF Strike Command and RAF Personnel and Training Command , resulting in a single command covering the whole RAF, led by the Chief of the Air Staff. Through its subordinate groups , Air Command oversees the whole spectrum of RAF aircraft and operations. United Kingdom Space Command (UKSC), established 1 April 2021 under
4704-408: The RAF operated alongside the Fleet Air Arm . During the war, RAF aircraft were deployed in the mid-Atlantic at RAF Ascension Island and a detachment from No. 1 Squadron was deployed with the Royal Navy, operating from the aircraft carrier HMS Hermes . RAF pilots also flew missions using the Royal Navy's Sea Harriers in the air-to-air combat role, in particular Flight Lieutenant Dave Morgan
4802-546: The RAF's intelligence, surveillance, target acquisition, and reconnaissance (ISTAR) capabilities. It oversees stations at RAF Coningsby and RAF Waddington in Lincolnshire, RAF Lossiemouth in Moray and RAF Marham in Norfolk. The group's Eurofighter Typhoon FGR4 aircraft protect UK and NATO airspace by providing a continuous Quick Reaction Alert capability. No. 2 Group controls the Air Mobility Force which provides strategic and tactical airlift , air-to-air refuelling and command support air transport (CSAT). The group
4900-427: The RAF's rotary-wing aircraft form part of the tri-service Joint Aviation Command in support of ground forces. Most of the RAF's aircraft and personnel are based in the UK, with many others serving on global operations (principally over Iraq and Syria ) or at long-established overseas bases ( Ascension Island , Cyprus , Gibraltar , and the Falkland Islands ). Although the RAF is the principal British air power arm,
4998-401: The Royal Air Force is the Chief of the Air Staff (CAS). He reports to the Chief of the Defence Staff , who is the professional head of the British Armed Forces . The incumbent Chief of the Air Staff is Air Chief Marshal Sir Richard Knighton who was appointed in 2023. The management of the RAF is the responsibility of the Air Force Board , a sub-committee of the Defence Council which
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#17328522876955096-478: The Second World War. Under the British Commonwealth Air Training Plan of December 1939, the air forces of British Commonwealth countries trained and formed " Article XV squadrons " for service with RAF formations. Many individual personnel from these countries, and exiles from occupied Europe , also served with RAF squadrons. By the end of the war the Royal Canadian Air Force had contributed more than 30 squadrons to serve in RAF formations, similarly, approximately
5194-404: The Soviet Union had the technology to create the airframe for a jet-powered strategic bomber comparable to Boeing's B-52 Stratofortress , they instead produced the Tupolev Tu-95 Bear, powered with four Kuznetsov NK-12 turboprops, mated to eight contra-rotating propellers (two per nacelle) with supersonic tip speeds to achieve maximum cruise speeds in excess of 575 mph, faster than many of
5292-423: The Suez Crisis, when an English Electric Canberra PR7 was shot down over Syria . In 1957, the RAF participated heavily during the Jebel Akhdar War in Oman, operating both de Havilland Venom and Avro Shackleton aircraft. The RAF made 1,635 raids, dropping 1,094 tons and firing 900 rockets at the interior of Oman between July and December 1958, targeting insurgents, mountain top villages and water channels in
5390-421: The United States and works in close cooperation with the U.S. Air Force in the development of the Lockheed Martin F-35B Lightning . No. 80 Squadron is part of the Australia, Canada and United Kingdom Reprogramming Laboratory (ACURL) at Eglin Air Force Base , Florida, and is tasked with compiling and testing the Mission Data File Sets (MDFS) for the F-35. No. 84 Squadron is located at RAF Akrotiri, operating
5488-578: The Vale of Glamorgan, RAF St Mawgan in Cornwall and RAF Valley on Anglesey. The No. 22 Group also manages the Royal Air Force Air Cadets . An RAF station is ordinarily subordinate to a group and is commanded by a group captain . Each station typically hosts several flying and non-flying squadrons or units which are supported by administrative and support wings. Front-line flying operations are focused at eight stations: Flying training takes places at RAF Barkston Heath , RAF College Cranwell , RAF Shawbury and RAF Valley , each forming part of
5586-405: The World's Aircraft . 2005–2006. Royal Air Force The Royal Air Force ( RAF ) is the air and space force of the United Kingdom , British Overseas Territories and Crown Dependencies . It was formed towards the end of the First World War on 1 April 1918, on the merger of the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS). Following the Allied victory over
5684-439: The air force's V bomber fleet. These were initially armed with nuclear gravity bombs , later being equipped with the Blue Steel missile . Following the development of the Royal Navy's Polaris submarines , the strategic nuclear deterrent passed to the navy's submarines on 30 June 1969. With the introduction of Polaris, the RAF's strategic nuclear role was reduced to a tactical one, using WE.177 gravity bombs. This tactical role
5782-494: The arrival of jet fighters and bombers. During the early stages of the Cold War, one of the first major operations undertaken by the RAF was the Berlin Airlift , codenamed Operation Plainfire. Between 26 June 1948 and the lifting of the Russian blockade of the city on 12 May 1949, the RAF provided 17% of the total supplies delivered, using Avro Yorks , Douglas Dakotas flying to Gatow Airport and Short Sunderlands flying to Lake Havel. The RAF saw its first post-war engagements in
5880-414: The command of Air Vice-Marshal Paul Godfrey is a joint command, but sits "under the Royal Air Force." Godfrey is of equal rank to the commanders of 1, 2, 11, and 22 Groups. The new command has "responsibility for not just operations, but also generating, training and growing the force, and also owning the money and putting all the programmatic rigour into delivering new ..capabilities." UKSC headquarters
5978-417: The compressor intake is at the aft of the engine, and the exhaust is situated forward, reducing the distance between the turbine and the propeller. Unlike the small-diameter fans used in turbofan engines, the propeller has a large diameter that lets it accelerate a large volume of air. This permits a lower airstream velocity for a given amount of thrust. Since it is more efficient at low speeds to accelerate
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#17328522876956076-459: The control system. The turboprop system consists of 3 propeller governors , a governor, and overspeed governor, and a fuel-topping governor. The governor works in much the same way a reciprocating engine propeller governor works, though a turboprop governor may incorporate beta control valve or beta lift rod for beta operation and is typically located in the 12 o'clock position. There are also other governors that are included in addition depending on
6174-463: The decline of the British Empire, global operations were scaled back, and RAF Far East Air Force was disbanded on 31 October 1971. Despite this, the RAF fought in many battles in the Cold War period. In June 1948, the RAF commenced Operation Firedog against Malayan pro-independence fighters during the Malayan Emergency . Operations continued for the next 12 years until 1960 with aircraft flying out of RAF Tengah and RAF Butterworth . The RAF played
6272-440: The first jet aircraft and comparable to jet cruising speeds for most missions. The Bear would serve as their most successful long-range combat and surveillance aircraft and symbol of Soviet power projection through to the end of the 20th century. The USA used turboprop engines with contra-rotating propellers, such as the Allison T40 , on some experimental aircraft during the 1950s. The T40-powered Convair R3Y Tradewind flying-boat
6370-422: The first deliveries of the Garrett AiResearch TPE331 , (now owned by Honeywell Aerospace ) on the Mitsubishi MU-2 , making it the fastest turboprop aircraft for that year. In contrast to turbofans , turboprops are most efficient at flight speeds below 725 km/h (450 mph; 390 knots) because the jet velocity of the propeller (and exhaust) is relatively low. Modern turboprop airliners operate at nearly
6468-569: The first hint of something abnormal, a controller has the option to put them on a higher level of alert, 'a call to cockpit'. In this scenario the pilot races to the hardened aircraft shelter and does everything short of starting his engines". On 4 October 2015, a final stand-down saw the end of more than 70 years of RAF Search and Rescue provision in the UK. The RAF and Royal Navy's Westland Sea King fleets, after over 30 years of service, were retired. A civilian contractor, Bristow Helicopters , took over responsibility for UK Search and Rescue, under
6566-487: The gas generator section, many turboprops today feature a free power turbine on a separate coaxial shaft. This enables the propeller to rotate freely, independent of compressor speed. Alan Arnold Griffith had published a paper on compressor design in 1926. Subsequent work at the Royal Aircraft Establishment investigated axial compressor-based designs that would drive a propeller. From 1929, Frank Whittle began work on centrifugal compressor-based designs that would use all
6664-404: The gas power produced by the engine for jet thrust. The world's first turboprop was designed by the Hungarian mechanical engineer György Jendrassik . Jendrassik published a turboprop idea in 1928, and on 12 March 1929 he patented his invention. In 1938, he built a small-scale (100 Hp; 74.6 kW) experimental gas turbine. The larger Jendrassik Cs-1 , with a predicted output of 1,000 bhp,
6762-402: The great bulk of the RAF's bombing campaign, mainly due to Harris, but it also developed precision bombing techniques for specific operations, such as the infamous "Dambusters" raid by No. 617 Squadron , or the Amiens prison raid known as Operation Jericho . Following victory in the Second World War, the RAF underwent significant re-organisation, as technological advances in air warfare saw
6860-462: The highest scoring pilot of the war. Following a British victory, the RAF remained in the South Atlantic to provide air defence to the Falkland Islands, with the McDonnell Douglas Phantom FGR2 based at RAF Mount Pleasant which was built in 1984. With the end of the Cold War and the collapse of the Soviet Union, the RAF's focus returned to expeditionary air power . Since 1990, the RAF has been involved in several large-scale operations, including
6958-567: The latest 2010 Strategic Defence and Security Review, the BAE Systems Nimrod MRA4 maritime patrol aircraft was cancelled due to over spending and missing deadlines. Other reductions saw total manpower reduced by 5,000 personnel to a trained strength of 33,000 and the early retirement of the Joint Force Harrier aircraft, the BAE Harrier GR7/GR9 . In recent years, fighter aircraft on Quick Reaction Alert (QRA) have been increasingly required to scramble in response to Russian Air Force aircraft approaching British airspace. On 24 January 2014, in
7056-406: The model, such as an overspeed and fuel topping governor on a Pratt & Whitney Canada PT6 , and an under-speed governor on a Honeywell TPE331 . The turboprop is also distinguished from other kinds of turbine engine in that the fuel control unit is connected to the governor to help dictate power. To make the engine more compact, reverse airflow can be used. On a reverse-flow turboprop engine,
7154-602: The most widespread turboprop airliners in service were the ATR 42 / 72 (950 aircraft), Bombardier Q400 (506), De Havilland Canada Dash 8 -100/200/300 (374), Beechcraft 1900 (328), de Havilland Canada DHC-6 Twin Otter (270), Saab 340 (225). Less widespread and older airliners include the BAe Jetstream 31 , Embraer EMB 120 Brasilia , Fairchild Swearingen Metroliner , Dornier 328 , Saab 2000 , Xian MA60 , MA600 and MA700 , Fokker 27 and 50 . Turboprop business aircraft include
7252-431: The northern sector of UK airspace, while Coningsby covers the southern sector. Typhoon pilot Flight Lieutenant Noel Rees describes how QRA duty works. "At the start of the scaled QRA response, civilian air traffic controllers might see on their screens an aircraft behaving erratically, not responding to their radio calls, or note that it's transmitting a distress signal through its transponder. Rather than scramble Typhoons at
7350-473: The occasion on 10 July 2018 with a flypast over London consisting of 103 aircraft. Between March 2020 and 2022, the RAF assisted with the response efforts to the COVID-19 pandemic in the United Kingdom as part of Operation Rescript . This saw the service provide repatriation flights and aeromedical evacuations of COVID-19 patients, drivers and call-handlers to support ambulance services and medics to assist with
7448-437: The original engine, and the Jetstream 2 was launched with the larger 965 hp (720 kW) Astazou XVI, starting deliveries in late 1969. The late delivery and engine problems had driven development costs to over £13 million, far more than the original £3 million projections. Only three Jetstream 2s would be completed before Handley Page went bankrupt, and the production line was eventually shut down in 1970. There
7546-487: The physical defence and maintenance of sovereignty of the British Overseas Territories and enable the UK to conduct expeditionary military operations . Although command and oversight of the bases is provided by Strategic Command , the airfield elements are known as RAF stations. Four RAF squadrons are based overseas. No. 17 Test and Evaluation Squadron is based at Edwards Air Force Base , California, in
7644-416: The pilot not being able to see out of the rear of the aircraft for backing and the amount of debris reverse stirs up, manufacturers will often limit the speeds beta plus power may be used and restrict its use on unimproved runways. Feathering of these propellers is performed by the propeller control lever. The constant-speed propeller is distinguished from the reciprocating engine constant-speed propeller by
7742-403: The point of exhaust. Some of the power generated by the turbine is used to drive the compressor and electric generator . The gases are then exhausted from the turbine. In contrast to a turbojet or turbofan , the engine's exhaust gases do not provide enough power to create significant thrust, since almost all of the engine's power is used to drive the propeller. Exhaust thrust in a turboprop
7840-494: The propeller that is converted to propeller thrust falls dramatically. For this reason turboprop engines are not commonly used on aircraft that fly faster than 0.6–0.7 Mach , with some exceptions such as the Tupolev Tu-95 . However, propfan engines, which are very similar to turboprop engines, can cruise at flight speeds approaching 0.75 Mach. To maintain propeller efficiency across a wide range of airspeeds, turboprops use constant-speed (variable-pitch) propellers. The blades of
7938-477: The propeller. This allows for propeller strike or similar damage to occur without damaging the gas generator and allowing for only the power section (turbine and gearbox) to be removed and replaced in such an event, and also allows for less stress on the start during engine ground starts. Whereas a fixed shaft has the gearbox and gas generator connected, such as on the Honeywell TPE331 . The propeller itself
8036-446: The propulsion airflow is less clearly defined for propellers than for fans. The propeller is coupled to the turbine through a reduction gear that converts the high RPM /low torque output to low RPM/high torque. This can be of two primary designs, free-turbine and fixed. A free-turbine turboshaft found on the Pratt & Whitney Canada PT6 , where the gas generator is not connected to
8134-419: The same aircraft type. Some schools operate with only one squadron, and have an overall training throughput which is relatively small; some, like No. 3 Flying Training School , have responsibility for all Elementary Flying Training (EFT) in the RAF, and all RAF aircrew will pass through its squadrons when they start their flying careers. No. 2 Flying Training School and No. 6 Flying Training School do not have
8232-585: The same speed as small regional jet airliners but burn two-thirds of the fuel per passenger. Compared to piston engines, their greater power-to-weight ratio (which allows for shorter takeoffs) and reliability can offset their higher initial cost, maintenance and fuel consumption. As jet fuel can be easier to obtain than avgas in remote areas, turboprop-powered aircraft like the Cessna Caravan and Quest Kodiak are used as bush airplanes . Turboprop engines are generally used on small subsonic aircraft, but
8330-471: The staffing of hospitals, testing units and vaccination centres. Under Operation Broadshare , the RAF has also been involved with COVID-19 relief operations overseas, repatriating stranded nationals and delivering medical supplies and vaccines to British Overseas Territories and military installations. The UK's 20-year long operations in Afghanistan came to an end in August 2021, seeing the largest airlift since
8428-568: The structural weight required for the pressurisation which enabled much higher altitude and consequent higher speed and comfort than competing unpressurised designs. The aisle between the seats had a 5 ft 11in headroom but the main spar formed a step in the aisle, which was a tripping hazard. Final assembly took place in a new factory at the Radlett aerodrome, but large portions of the structure were subcontracted, including complete wings being built by Scottish Aviation at Prestwick , Scotland and
8526-435: The tail section by Northwest Industries of Edmonton, Alberta , Canada. The original design used Turbomeca Astazou XVI engines of approximately 840 hp (626 kW), and flew on 18 August 1967 as the Jetstream 1 . Throughout the test program the engines proved to be a weak point, being generally underpowered for the design, and surprisingly temperamental for what was then a mature and widely used turboshaft design. Testing
8624-555: The war was the strategic bombing campaign against Germany by Bomber Command. While RAF bombing of Germany began almost immediately upon the outbreak of war at first it was ineffectual; it was only later, particularly under the leadership of Air Chief Marshal Harris , that these attacks became increasingly devastating, from early 1943 onward, as new technology and greater numbers of superior aircraft became available. The RAF adopted night-time area bombing on German cities such as Hamburg and Dresden . Night time area bombing constituted
8722-410: The way down to zero pitch, producing very little to zero-thrust and is typically accessed by moving the power lever to a beta for taxi range. Beta plus power is a reverse range and produces negative thrust, often used for landing on short runways where the aircraft would need to rapidly slow down, as well as backing operations and is accessed by moving the power lever below the beta for taxi range. Due to
8820-641: Was continued by the V bombers into the 1980s and until 1998 by the Panavia Tornado GR1 . For much of the Cold War the primary role of the RAF was the defence of Western Europe against potential attack by the Soviet Union , with many squadrons based in West Germany . The main RAF bases in RAF(G) were RAF Brüggen , RAF Gutersloh , RAF Laarbruch and RAF Wildenrath – the only air defence base in RAF(G). With
8918-454: Was destroyed in a bombing raid. In 1941, the engine was abandoned due to war, and the factory converted to conventional engine production. The first mention of turboprop engines in the general public press was in the February 1944 issue of the British aviation publication Flight , which included a detailed cutaway drawing of what a possible future turboprop engine could look like. The drawing
9016-593: Was enough interest in the design that it was first picked up by a collaboration of investors and Scottish Aviation which formed a company called "Jetstream Aircraft" to produce the aircraft. Initially production moved to Sywell Aerodrome in Northamptonshire, the CEO being Bill Bright. A further ten Jetstream 1s were produced by this team. Scottish Aviation continued production of the Jetstream 2 as well, although referring to it as
9114-635: Was eventually moved to the Turboméca factory airfield in the south of France, both to allow faster turnaround with engine work, and in order to improve the schedule by taking advantage of the better weather. In order to improve sales prospects in the US, the fifth prototype was fitted with the US-built Garrett TPE-331 in place of the French Astazou. Changing to the US-built engine was enough to allow
9212-686: Was operated by the U.S. Navy for a short time. The first American turboprop engine was the General Electric XT31 , first used in the experimental Consolidated Vultee XP-81 . The XP-81 first flew in December 1945, the first aircraft to use a combination of turboprop and turbojet power. The technology of Allison's earlier T38 design evolved into the Allison T56 , used to power the Lockheed Electra airliner, its military maritime patrol derivative
9310-629: Was produced and tested at the Ganz Works in Budapest between 1937 and 1941. It was of axial-flow design with 15 compressor and 7 turbine stages, annular combustion chamber. First run in 1940, combustion problems limited its output to 400 bhp. Two Jendrassik Cs-1s were the engines for the world's first turboprop aircraft – the Varga RMI-1 X/H . This was a Hungarian fighter-bomber of WWII which had one model completed, but before its first flight it
9408-416: Was responsible for the design. The original design dates from 1965 as a 12-seat (six rows with a centre aisle) aircraft. The aircraft was a low-wing, high-tail monoplane of conventional layout. Considerable attention was paid to streamlining in order to improve performance, which led to one of the design's more distinctive features, a long nose profile. The fuselage had a circular cross-section to minimize
9506-593: Was the first turboprop aircraft of any kind to go into production and sold in large numbers. It was also the first four-engined turboprop. Its first flight was on 16 July 1948. The world's first single engined turboprop aircraft was the Armstrong Siddeley Mamba -powered Boulton Paul Balliol , which first flew on 24 March 1948. The Soviet Union built on German World War II turboprop preliminary design work by Junkers Motorenwerke, while BMW, Heinkel-Hirth and Daimler-Benz also worked on projected designs. While
9604-481: Was very close to what the future Rolls-Royce Trent would look like. The first British turboprop engine was the Rolls-Royce RB.50 Trent , a converted Derwent II fitted with reduction gear and a Rotol 7 ft 11 in (2.41 m) five-bladed propeller. Two Trents were fitted to Gloster Meteor EE227 — the sole "Trent-Meteor" — which thus became the world's first turboprop-powered aircraft to fly, albeit as
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