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101-554: The Anti-Concorde Project , founded by environmental activist Richard Wiggs, challenged the idea of supersonic passenger transport, and curtailed Concorde 's commercial prospects. When Concorde entered service in 1976, of the 74 options (non-binding orders, from 16 airlines) held at the time of the first flight, only those for the state airlines of Britain ( BOAC ) and France ( Air France ) were taken up, so that only 20 were built, although flights were also flown for Braniff International and Singapore Airlines . It triggered research into

202-640: A Supreme Court ruling allowed flights into JFK. In December 1977 the aircraft flew the London – Singapore round trip route three times in Singapore Airlines livery before the Malaysian government rescinded permission from overflying their airspace, likely as a result of their own airline being denied increased access to London. Concorde was also denied permission to overfly India as the United Kingdom government

303-543: A class, can supply increased fuel efficiency at supersonic speeds, even though their specific fuel consumption is greater at higher speeds. Because their speed over the ground is greater, this decrease in efficiency is less than proportional to speed until well above Mach 2, and the consumption per unit distance is lower. When Concorde was being designed by Aérospatiale – BAC , high bypass jet engines (" turbofan " engines) had not yet been deployed on subsonic aircraft. Had Concorde entered service against earlier designs like

404-473: A compromise in performance is chosen, often to the detriment of low speed flight. For example, Concorde had very high drag (a lift to drag ratio of about 4) at slow speed, but it travelled at high speed for most of the flight. Designers of Concorde spent 5000 hours optimizing the vehicle shape in wind tunnel tests to maximize the overall performance over the entire flightplan. The Boeing 2707 featured swing wings to give higher efficiency at low speeds, but

505-542: A controlled dive during a test flight at Edwards Air Force Base. The crew were William Magruder (pilot), Paul Patten (copilot), Joseph Tomich (flight engineer), and Richard H. Edwards (flight test engineer). This is the first supersonic flight by a civilian airliner. In total, 20 Concordes were built: two prototypes, two development aircraft and 16 production aircraft. Of the sixteen production aircraft, two did not enter commercial service and eight remained in service as of April 2003. All but two of these aircraft are preserved;

606-415: A few decades. These materials, such as carbon fibre and Kevlar are much stronger for their weight (important to deal with stresses) as well as being more rigid. As per-seat weight of the structure is much higher in an SST design, structural improvements would have led to a greater proportional improvement than the same changes in a subsonic aircraft. Higher fuel costs and lower passenger capacities due to

707-433: A guide and means of comparison, observing that no detectable ozone loss was evident from approximately 213 megatons of explosive energy being released in 1962, so therefore the equivalent amount of NOx from "1047" Concordes flying "10 hours a day", would likewise, not be unprecedented. In 1981 models and observations were still irreconcilable. More recent computer models in 1995 by David W. Fahey, an atmospheric scientist at

808-578: A letter to The Times in July 1967, Wiggs wrote: Anti-Concord Project From Richard Wiggs Sir, Miss Pamela Hansford and Sir Alec Guinness (July 5 and 10), and many other readers of 'The Times' may be glad to know of the existence of the Anti-Concord Project, which has been founded by a group of some hundreds of people including scientists, artists, business men, civil servants, farmers, housewives, professors, M.P.s etc. who are concerned and alarmed at

909-485: A mode of transport does not typically lead to such technological investments to increase the speed. Instead, the service providers prefer to compete in service quality and cost. An example of this phenomenon is high-speed rail . The speed limit of rail transport had been pushed so hard to enable it to effectively compete with road and air transport. But this achievement was not done for different rail operating companies to compete among themselves. This phenomenon also reduces

1010-584: A much stronger (and therefore heavier) structure because their fuselage must be pressurized to a greater differential than subsonic aircraft, which do not operate at the high altitudes necessary for supersonic flight. These factors together meant that the empty weight per seat of Concorde is more than three times that of a Boeing 747. Concorde and the TU-144 were both constructed of conventional aluminum: Concorde of Hiduminium and TU-144 of duralumin . Modern, advanced materials were not to come out of development for

1111-788: A physicist and senior research associate at the Cambridge Electron Accelerator, founded the Citizens' League Against the Sonic Boom in March 1967. Andrew Wilson wrote: The League "adopted the same propaganda techniques as the Project with astounding success." In December 1970, the US Senate voted to prohibit commercial supersonic flights over the US and to restrict noise levels at US airports. Sweden, Norway,

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1212-460: A plane is traveling faster than the speed of sound (i.e. faster than air molecules normally travel) the air ahead of it is not pushed out of the way: the air remains still until the plane has approached to within half an inch, at which point the air is forced aside in a few millionths of a second. This creates extreme local compression and heating, and a shockwave spreads outwards in a cone. This pressure wave extends as much as 25 miles on either side of

1313-512: A second flight from Edinburgh , and a third which had taken off from Heathrow on a loop flight over the Bay of Biscay . By the end of the 20th century, projects like the Tupolev Tu-244 , Tupolev Tu-344 , SAI Quiet Supersonic Transport , Sukhoi-Gulfstream S-21 , High Speed Civil Transport , etc. had not been realized. For all vehicles traveling through air, the force of drag is proportional to

1414-480: A serious issue due to the high altitudes at which the planes flew, but experiments in the mid-1960s such as the controversial Oklahoma City sonic boom tests and studies of the USAF 's North American XB-70 Valkyrie proved otherwise (see Sonic boom § Abatement ). By 1964, whether civilian supersonic aircraft would be licensed was unclear, because of the problem. The annoyance of a sonic boom can be avoided by waiting until

1515-620: A single return trip could be made per day, so the extra speed was not an advantage to the airline other than as a selling feature to its customers. The proposed American SSTs were intended to fly at Mach 3, partly for this reason. However, allowing for acceleration and deceleration time, a trans-Atlantic trip on a Mach 3 SST would be less than three times as fast as a Mach 1 trip. Since SSTs produce sonic booms at supersonic speeds they are rarely permitted to fly supersonic over land, and must fly supersonic over sea instead. Since they are inefficient at subsonic speeds compared to subsonic aircraft, range

1616-424: A speed increase. Also, for-profit companies generally prefer low risk business plans with high probabilities of appreciable profit, but an expensive leading-edge technological research and development program is a high-risk enterprise, as it is possible that the program will fail for unforeseeable technical reasons or will meet cost overruns so great as to force the company, due to financial resource limits, to abandon

1717-435: A supersonic aircraft needs to change with its speed for optimal performance. Thus, an SST would ideally change shape during flight to maintain optimal performance at both subsonic and supersonic speeds. Such a design would introduce complexity which increases maintenance needs, operations costs, and safety concerns. In practice all supersonic transports have used essentially the same shape for subsonic and supersonic flight, and

1818-524: A threat that was, in 1974, seemingly validated by an MIT team commissioned by the United States Department of Transportation . However, while many purely theoretical models were indicating the potential for large ozone losses from SST nitrogen oxides ( NOx ), other scientists in the paper " Nitrogen Oxides, Nuclear Weapon Testing , Concorde and Stratospheric Ozone " turned to historical ozone monitoring and atmospheric nuclear testing to serve as

1919-607: A three-month period in 1967. In July 1967, the UK Ministry of Technology staged eleven supersonic test flights over the south of England using Lightning fighters. The booms were to be measured by the RAF to relate them to the resulting public reaction. The Guardian ' s opinion survey stated: "Nearly two thirds of the population of Bristol were frightened, startled or annoyed by the sonic booms to which they were subjected to last week." The Ministry received 12,000 complaints. Both Wiggs and

2020-454: A typical wing design will cut its L/D ratio in half (e.g., Concorde managed a ratio of 7.14, whereas the subsonic Boeing 747 has an L/D ratio of 17). Because an aircraft's design must provide enough lift to overcome its own weight, a reduction of its L/D ratio at supersonic speeds requires additional thrust to maintain its airspeed and altitude. Jet engine design shifts significantly between supersonic and subsonic aircraft. Jet engines, as

2121-579: A vice president with Lockheed , stated to various magazines that an SST constructed of steel weighing 250,000 pounds (110,000 kg) could be developed for $ 160 million and in production lots of 200 or more sold for around $ 9 million. But it was the Anglo-French development of the Concorde that set off panic in the US industry, where it was thought that Concorde would soon replace all other long range designs, especially after Pan Am took out purchase options on

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2222-421: Is a function of forward speed, which decreases from propellers, to fans, to no bypass at all as speed increases. Additionally, the large frontal area taken up by the low-pressure fan at the front of the engine increases drag, especially at supersonic speeds, and means the bypass ratios are much more limited than on subsonic aircraft. For example, the early Tu-144S was fitted with a low bypass turbofan engine which

2323-409: Is a shock-wave, or pressure disturbance, caused by the movement of the plane through the air, much like the wave produced by the bow of a ship as it moves through water: just as the bow wave is produced for the entire journey of the ship, so the sonic shockwave occurs throughout the duration of a supersonic flight. In subsonic flight, the plane pushes the air ahead of it out of the way as it moves. When

2424-515: Is actually just a sonic boom . The first human-made supersonic boom was likely caused by a piece of common cloth, leading to the whip's eventual development. It's the wave motion travelling through the bullwhip that makes it capable of achieving supersonic speeds. Most modern firearm bullets are supersonic, with rifle projectiles often travelling at speeds approaching and in some cases well exceeding Mach 3 . Most spacecraft are supersonic at least during portions of their reentry, though

2525-457: Is aimed at producing an acceptable aircraft. Supersonic airliners have been the objects of numerous recent ongoing design studies. Drawbacks and design challenges are excessive noise generation (at takeoff and due to sonic booms during flight), high development costs, expensive construction materials, high fuel consumption, extremely high emissions, and an increased cost per seat over subsonic airliners. However, despite these challenges, Concorde

2626-442: Is deteriorated and the number of routes that the aircraft can fly non-stop is reduced. This also reduces the desirability of such aircraft for most airlines. Supersonic aircraft have higher per-passenger fuel consumption than subsonic aircraft; this makes the ticket price necessarily higher, all other factors being equal, as well as making that price more sensitive to the price of oil. (It also makes supersonic flights less friendly to

2727-403: Is low at take-off, but is forced high during supersonic cruise. Transition between the two modes would occur at some point during the climb and back again during the descent (to minimize jet noise upon approach). The difficulty is devising a variable cycle engine configuration that meets the requirement for a low cross-sectional area during supersonic cruise. The sonic boom was not thought to be

2828-444: Is more complex. The main key to having low supersonic drag is to properly shape the overall aircraft to be long and thin, and close to a "perfect" shape, the von Karman ogive or Sears-Haack body . This has led to almost every supersonic cruising aircraft looking very similar to every other, with a very long and slender fuselage and large delta wings, cf. SR-71 , Concorde , etc. Although not ideal for passenger aircraft, this shaping

2929-433: Is more efficient, it is still less efficient than flying subsonically. Another issue in supersonic flight is the lift to drag ratio (L/D ratio) of the wings. At supersonic speeds, airfoils generate lift in an entirely different manner than at subsonic speeds, and are invariably less efficient. For this reason, considerable research has been put into designing wing planforms for sustained supersonic cruise. At about Mach 2,

3030-486: Is not able to withstand temperatures much over 127 °C; above 127 °C the aluminium gradually loses its properties that were brought about by age hardening. For aircraft that have flown at Mach 3, materials such as stainless steel ( XB-70 Valkyrie , MiG-25 ) or titanium ( SR-71 , Sukhoi T-4 ) have been used. The range of an aircraft depends on three efficiencies which appear in the Breguet range equation. They are

3131-551: Is quite adaptable for bomber use. Supersonic transport A supersonic transport ( SST ) or a supersonic airliner is a civilian supersonic aircraft designed to transport passengers at speeds greater than the speed of sound . To date, the only SSTs to see regular service have been Concorde and the Tupolev Tu-144 . The last passenger flight of the Tu-144 was in June 1978 and it

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3232-544: The Black Rock Desert on 15 October 1997. The Bloodhound LSR project planned an attempt on the record in 2020 at Hakskeenpan in South Africa with a combination jet and hybrid rocket propelled car. The aim was to break the existing record, then make further attempts during which (the members of) the team hoped to reach speeds of up to 1,600 km/h (1,000 mph). The effort was originally run by Richard Noble who

3333-525: The Boeing 707 or de Havilland Comet , it would have been much more competitive, though the 707 and DC-8 still carried more passengers. When these high bypass jet engines reached commercial service in the 1960s, subsonic jet engines immediately became much more efficient, closer to the efficiency of turbojets at supersonic speeds. One major advantage of the SST disappeared. Turbofan engines improve efficiency by increasing

3434-413: The Boeing 747 carrying four times that, the speed and fuel advantages of the SST concept were taken away by sheer size. Another problem was that the wide range of speeds over which an SST operates makes it difficult to improve engines. While subsonic engines had made great strides in increased efficiency through the 1960s with the introduction of the turbofan engine with ever-increasing bypass ratios ,

3535-467: The National Oceanic and Atmospheric Administration , and others, suggest that the drop in ozone would be at most, "no more" than 1 to 2% if a fleet of 500 supersonic aircraft [were] operated. Fahey expressed that this would not be a fatal obstacle for an advanced SST development – while "a big caution flag...[it] should not be a showstopper for advanced SST development" because "removing the sulfur in

3636-548: The Tu-144 , which the western press nicknamed the "Concordski". The SST was seen as particularly offensive due to its sonic boom and the potential for its engine exhaust to damage the ozone layer . Both problems impacted the thinking of lawmakers, and eventually Congress dropped funding for the US SST program in March 1971, and all overland commercial supersonic flight was banned over

3737-573: The Tupolev Tu-144 . Both of these passenger aircraft and some modern fighters are also capable of supercruise , a condition of sustained supersonic flight without the use of an afterburner . Due to its ability to supercruise for several hours and the relatively high frequency of flight over several decades, Concorde spent more time flying supersonically than all other aircraft combined by a considerable margin. Since Concorde's final retirement flight on November 26, 2003, there are no supersonic passenger aircraft left in service. Some large bombers , such as

3838-555: The Tupolev Tu-160 and Rockwell B-1 Lancer are also supersonic-capable. The aerodynamics of supersonic aircraft is simpler than subsonic aerodynamics because the airsheets at different points along the plane often cannot affect each other. Supersonic jets and rocket vehicles require several times greater thrust to push through the extra aerodynamic drag experienced within the transonic region (around Mach 0.85–1.2). At these speeds aerospace engineers can gently guide air around

3939-409: The coefficient of drag ( C d ), to the square of the airspeed and to the air density. Since drag rises rapidly with speed, a key priority of supersonic aircraft design is to minimize this force by lowering the coefficient of drag. This gives rise to the highly streamlined shapes of SSTs. To some extent, supersonic aircraft also manage drag by flying at higher altitudes than subsonic aircraft, where

4040-577: The delta wing in most studies, including the Sud Aviation Super-Caravelle and Bristol Type 223 , although Armstrong-Whitworth proposed a more radical design, the Mach 1.2 M-Wing . Avro Canada proposed several designs to TWA that included Mach 1.6 double-ogee wing and Mach 1.2 delta-wing with separate tail and four under-wing engine configurations. Avro's team moved to the UK where its design formed

4141-513: The fuselage of the aircraft without producing new shock waves , but any change in cross area farther down the vehicle leads to shock waves along the body. Designers use the Supersonic area rule and the Whitcomb area rule to minimize sudden changes in size. However, in practical applications, a supersonic aircraft must operate stably in both subsonic and supersonic profiles, hence aerodynamic design

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4242-481: The Anti-Concord Project claimed that the Concorde was louder than conventional aircraft on take-off and landing as a result of its delta wing being optimized for high speeds so it needed to use more power than conventional aircraft. When measured in 1977, the British Civil Aviation Authority (CAA) noted: On departure, the Concorde was generally a few PNdb noiser than the older long-range jets at

4343-572: The Concorde (with escalating costs) had been shortlisted for cancellation. The 1962 development estimates for Concorde were £150-170m, and had risen to £280m. Evidence of financial mismanagement also emerged and the UK Treasury, responsible for tracking government spending, had not been involved in drawing up the Anglo-French agreement to build Concorde, and was not represented on the Concorde Finance Committee. The British government announced

4444-504: The Concorde's sonic booms would produce effects varying from annoyance to physical shock, breaking windows and causing structural damage to buildings. In letters to the paper, some readers wrote that this would be an "intolerable price for ordinary citizens to pay for the transportation of privileged business travelers" A reader, Mr. D. W. Rowell, wrote that he would support an anti-Concorde movement, if only someone would organize it. Public figures who wrote to newspapers expressing concern about

4545-421: The Concorde. Congress was soon funding an SST design effort, selecting the existing Lockheed L-2000 and Boeing 2707 designs, to produce an even more advanced, larger, faster and longer ranged design. The Boeing 2707 design was eventually selected for continued work, with design goals of ferrying around 300 passengers and having a cruising speed near to Mach 3 . The Soviet Union set out to produce its own design,

4646-552: The Government to make this decision. Our further aim (in co-operation with similar movements in other countries) is to help bring about the banning of supersonic transports internationally. We shall be glad to hear from people who agree with these aims. Yours faithfully, RICHARD WIGGS, Convener. Before the new Labour government took office in October 1964 with a £700m annual deficit, Government-funded "prestige projects" such as

4747-536: The London–New York route in mind. The plane was allowed into Washington, D.C. (at Dulles in Virginia ), and the service was so popular that New Yorkers were soon complaining because they did not have it. It was not long before Concorde was flying into JFK . Along with shifting political considerations, the flying public continued to show interest in high-speed ocean crossings. This started additional design studies in

4848-641: The Netherlands, West Germany and Switzerland indicated that they would be unlikely to permit supersonic over-flights. Ireland drafted legislation, and Canada prohibited supersonic over-flight. Opposition and route restrictions aside, the BOAC and Air France maintained plans to fly supersonic over "sparsely populated" regions such as the deserts of Africa, Saudi Arabia and Australia. Restricting supersonic flight to over water meant that when Concorde entered service in January 1976,

4949-425: The SST fleet would emit ~96 million metric tons of CO₂ per year (like American , Delta and Southwest combined in 2017), 1.6 to 2.4 gigatonnes of CO₂ over their 25-year lifetime: one-fifth of the international aviation carbon budget if aviation maintains its emissions share to stay under a 1.5 °C climate trajectory . Noise exposed area around airports could double compared to existing subsonic aircraft of

5050-404: The US in 2005 as a PBS Nova documentary, Supersonic Dream, and includes archival footage of Wiggs and interviews with family members. As narrator Richard Donat explains: "In Britain, Concorde's nemesis came in the guise of a retired schoolteacher, Richard Wiggs. Working from his family home, his aim was simple: to stop Concorde from flying." Supersonic Sounds are traveling vibrations in

5151-466: The US, under the name "AST" (Advanced Supersonic Transport). Lockheed's SCV was a new design for this category, while Boeing continued studies with the 2707 as a baseline. By this time, the economics of past SST concepts were no longer reasonable. When first designed, the SSTs were envisioned to compete with long-range aircraft seating 80 to 100 passengers such as the Boeing 707 , but with newer aircraft such as

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5252-415: The US. Presidential advisor Russell Train warned that a fleet of 500 SSTs flying at 65,000 ft (20 km) for a period of years could raise stratospheric water content by as much as 50% to 100%. According to Train, this could lead to greater ground-level heat and hamper the formation of ozone . Later, an additional threat to the ozone was hypothesized as a result of the exhaust's nitrogen oxides ,

5353-405: The aerodynamic efficiency, which says how much wanted lift can be produced without too much unwanted drag, powerplant efficiency, which says how much fuel is converted into moving the aircraft against its drag resistance, and structural efficiency, which says how heavy the structure is compared to the fuel and passengers it can carry. Airlines potentially value very fast aircraft, because it enables

5454-524: The aerodynamic requirement for a narrow fuselage make SSTs an expensive form of commercial civil transportation compared with subsonic aircraft. For example, the Boeing 747 can carry more than three times as many passengers as Concorde while using approximately the same amount of fuel. Nevertheless, fuel costs are not the bulk of the price for most subsonic aircraft passenger tickets. For the transatlantic business market that SST aircraft were utilized for, Concorde

5555-591: The air density is lower. As speeds approach the speed of sound, the additional phenomenon of wave drag appears. This is a powerful form of drag that begins at transonic speeds (around Mach 0.88 ). Around Mach 1, the peak coefficient of drag is four times that of subsonic drag. Above the transonic range, the coefficient drops drastically again, although remains 20% higher by Mach 2.5 than at subsonic speeds. Supersonic aircraft must have considerably more power than subsonic aircraft require to overcome this wave drag, and although cruising performance above transonic speed

5656-644: The aircraft is at high altitude over water before reaching supersonic speeds; this was the technique used by Concorde. However, it precludes supersonic flight over populated areas. Supersonic aircraft have poor lift/drag ratios at subsonic speeds as compared to subsonic aircraft (unless technologies such as variable-sweep wings are employed), and hence burn more fuel, which results in their use being economically disadvantageous on such flight paths. Concorde had an overpressure of 1.94 lb/sq ft (93 Pa) (133 dBA SPL). Overpressures over 1.5 lb/sq ft (72 Pa) (131 dBA SPL) often cause complaints. If

5757-502: The aircraft spends a considerable amount of time in cruise. SST designs flying at least three times as fast as existing subsonic transports were possible, and would thus be able to replace as many as three planes in service, and thereby lower costs in terms of manpower and maintenance. Serious work on SST designs started in the mid-1950s, when the first generation of supersonic fighter aircraft were entering service. In Britain and France, government-subsidized SST programs quickly settled on

5858-495: The aircraft to make more flights per day, providing a higher return on investment. Also, passengers generally prefer faster, shorter-duration trips to slower, longer-duration trips, so operating faster aircraft can give an airline a competitive advantage, even to the extent that many customers will willingly pay higher fares for the benefit of saving time and/or arriving sooner. However, Concorde's high noise levels around airports, time zone issues, and insufficient speed meant that only

5959-413: The airline desirability of SSTs, because, for very long-distance transportation (a couple of thousand kilometers), competition between different modes of transport is rather like a single-horse race: air transport does not have a significant competitor. The only competition is between the airline companies, and they would rather pay moderately to reduce cost and increase service quality than pay much more for

6060-408: The amount of cold low-pressure air they accelerate, using some of the energy normally used to accelerate hot air in the classic non-bypass turbojet. The ultimate expression of this design is the turboprop , where almost all of the jet thrust is used to power a very large fan – the propeller . The efficiency curve of the fan design means that the amount of bypass that maximizes overall engine efficiency

6161-479: The approach noise of the Concorde is somewhat higher than that for present day commercial aircraft. The takeoff noise is, for locations close the airport, considerably higher than present aircraft. Considerably higher, here, means more than an order of magnitude (10 db) louder. In late 1969, the British Aircraft Corporation referred to "the assumption that supersonic flight will be allowed only over

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6262-561: The basis of Hawker Siddeley 's designs. By the early 1960s, the designs had progressed to the point where the go-ahead for production was given, but costs were so high that the Bristol Aeroplane Company and Sud Aviation eventually merged their efforts in 1962 to produce Concorde. In the early 1960s, various executives of US aerospace companies were telling the US public and Congress that there were no technical reasons an SST could not be produced. In April 1960, Burt C Monesmith,

6363-445: The beginning of the 20th century, the term "supersonic" was used as an adjective to describe sound whose frequency is above the range of normal human hearing. The modern term for this meaning is " ultrasonic ", but the older meaning sometimes still lives on, as in the word superheterodyne The tip of a bullwhip is generally seen as the first object designed to reach the speed of sound. This action results in its telltale "crack", which

6464-459: The cancellation of the Concord on 19 November but rescinded it the next day due to agreements with France and to the massive layoffs that would have resulted, but did cancel other projects. Wiggs believed that a strong enough lobby might have forced the cancellation. Wiggs began publishing claims about ozone depletion, sonic booms, airport noise, fuel consumption, potential profitability, and claimed that

6565-591: The capability of reducing the boom by about half. Even lengthening the vehicle (without significantly increasing the weight) would seem to reduce the boom intensity (see Sonic boom § Abatement ). When it comes to public policy, for example, the FAA prohibits commercial airplanes from flying at supersonic speeds above sovereign land governed by the United States because of the negative impact the sonic boom brings to humans and animal populations below. The aerodynamic design of

6666-477: The development of Concorde included Alec Guinness , and Pamela Hansford Johnson , and Baroness Snow. A primary school teacher, conscientious objector and vegan from Letchworth , Hertfordshire , Richard Wiggs, wrote to The Observer inviting people to write to him. He received 80 letters the next day, and within a few months gave up teaching to become full-time organiser of the Anti-Concorde Project. In

6767-575: The early 1960s suggested that sonic booms and aircraft engine noise would not be widely accepted. The Anti-Concorde Project was founded in 1966 by Richard Wiggs (a school teacher) to oppose the development of supersonic passenger transport. Wiggs positioned the Concorde as a test case in the confrontation between the environment and technology. An Anglo-French Agreement to build Concorde was signed in 1962. In 1963, The Observer newspaper published The Supersonic Threat , based on Lundberg's study Speed and Safety In Civil Aviation. The article claimed that

6868-414: The effects on the spacecraft are reduced by low air densities. During ascent, launch vehicles generally avoid going supersonic below 30 km (~98,400 feet) to reduce air drag. Note that the speed of sound decreases somewhat with altitude, due to lower temperatures found there (typically up to 25 km). At even higher altitudes the temperature starts increasing, with the corresponding increase in

6969-742: The effort before it yields any marketable SST technology, causing potentially all investment to be lost. The International Council on Clean Transportation (ICCT) estimates a SST would burn 5 to 7 times as much fuel per passenger. The ICCT shows that a New York to London supersonic flight would consume more than twice as much fuel per passenger than in subsonic business-class , six times as much as for economy class , and three times as much as subsonic business for Los Angeles to Sydney. Designers can either meet existing environmental standards with advanced technology or lobby policymakers to establish new standards for SSTs. If there were 2,000 SSTs in 2035, there would be 5,000 flights per day at 160 airports and

7070-452: The efforts being made to develop supersonic aircraft. We see this as a clear case of a choice having to be made – is technology to be sanely controlled or is it to be allowed increasingly to degrade and destroy our environment? Our immediate aims are to help create in Britain a climate of public opinion in which it will be possible for the Government to terminate work upon Concord, and to press

7171-461: The environment and sustainability, two growing concerns of the general public, including air travelers.) Investing in research and development work to design a new SST can be considered as an effort to push the speed limit of air transport. Generally, other than an urge for new technological achievement, the major driving force for such an effort is competitive pressure from other modes of transport. Competition between different service providers within

7272-501: The factors affecting the creation of sonic booms , which led to the Shaped Sonic Boom Demonstration which achieved their goal of reducing the intensity of sonic booms (by about one-third), and echoed public concern about aircraft noise that resulted in more restrictive noise limits for aircraft and airport operations, as well as changes in both operating procedures and aircraft design to further reduce noise levels. In

7373-451: The fan concept is difficult to use at supersonic speeds where the "proper" bypass is about 0.45, as opposed to 2.0 or higher for subsonic designs. For both of these reasons the SST designs were doomed by higher operational costs, and the AST programs vanished by the early 1980s. Concorde only sold to British Airways and Air France, with subsidized purchases that were to return 80% of the profits to

7474-448: The fixed monitoring points and noticeably noisier both closer to and further from the airport. At the arrival sites, Concorde was a few PNdb noisier than the older long range jets, except at 1.5 km from runway threshold, where it was on a par with the B 707. In the US, the Concorde noise was measured at DFW and Dulles airports: Based on the data given in Tables 11 and 12, it appears that

7575-403: The flight path, and may be experienced as a loud sound, with accompanying vibration severe enough in close proximity to break windows and damage buildings. Development had begun before the effects of sonic boom tests had been conducted. During 1961 and 1962, 150 supersonic flights were made over St Louis, Missouri, in 1964, flights were made over Oklahoma City for five months, and in 1965, there

7676-410: The form of pressure waves in an elastic medium. Objects move at supersonic speed when the objects move faster than the speed at which sound propagates through the medium. In gases, sound travels longitudinally at different speeds, mostly depending on the molecular mass and temperature of the gas, and pressure has little effect. Since air temperature and composition varies significantly with altitude,

7777-441: The fuel of the [Concorde]" would essentially eliminate the hypothesized 1%–2% ozone-destruction-reaction-pathway. Despite the model-observation discrepancy surrounding the ozone concern, in the mid-1970s, six years after its first supersonic test flight, Concorde was now ready for service. The US political outcry was so high that New York banned the plane. This threatened the aircraft's economic prospects — it had been built with

7878-424: The government. In practice for almost all of the length of the arrangement, there was no profit to be shared. After Concorde was privatized, cost reduction measures (notably the closing of the metallurgical wing testing site which had done enough temperature cycles to validate the aircraft through to 2010) and ticket price raises led to substantial profits. Since Concorde stopped flying, it has been revealed that over

7979-547: The increased space required for such a feature produced capacity problems that proved ultimately insurmountable. North American Aviation had an unusual approach to this problem with the XB-70 Valkyrie . By lowering the outer panels of the wings at high Mach numbers, they were able to take advantage of compression lift on the underside of the aircraft. This improved the L/D ratio by about 30%. Aircraft are surrounded by an air layer

8080-407: The intensity of the boom can be reduced, then this may make even very large designs of supersonic aircraft acceptable for overland flight. Research suggests that changes to the nose cone and tail can reduce the intensity of the sonic boom below that needed to cause complaints. During the original SST efforts in the 1960s, it was suggested that careful shaping of the fuselage of the aircraft could reduce

8181-422: The intensity of the sonic boom's shock waves that reach the ground. One design caused the shock waves to interfere with each other, greatly reducing the sonic boom. This was difficult to test at the time, but the increasing power of computer-aided design has since made this considerably easier. In 2003, a Shaped Sonic Boom Demonstration aircraft was flown which proved the soundness of the design and demonstrated

8282-468: The late 1950s, following the breaking of the sound barrier, first by experimental aircraft, then military aircraft, a supersonic passenger aircraft was thought feasible. By the early 1970s however, opposition led to bans on commercial supersonic flight in Sweden, Norway, the Netherlands, West Germany, Switzerland, Ireland, Canada and the United States. The choice of routes available was limited as supersonic flight

8383-617: The life of Concorde, the plane did prove profitable, at least to British Airways. Concorde operating costs over nearly 28 years of operation were approximately £1 billion, with revenues of £1.75 billion. On 25 July 2000, Air France Flight 4590 crashed shortly after take-off with all 109 occupants and four on ground killed; the only fatal incident involving Concorde . Commercial service was suspended until November 2001, and Concorde aircraft were retired in 2003 after 27 years of commercial operations. The last regular passenger flights landed at London Heathrow on October 24, 2003, from New York ,

8484-640: The national press, initially in New Scientist , New Society and the New Statesman , and later, full page advertisements in The Guardian , The Times , and The Observer . The advertisements argued against supersonic transport, and requested donations for further advertisements. Later advertisements included the names of contributors. Following his initial letters to the newspapers, Wiggs enlisted an Anti-Concorde Project Advisory Committee: A sonic boom

8585-482: The oceans or over areas with sparse populations" as "extremely pessimistic" saying that they "do not expect that its sonic boom will be unacceptable to the great majority of the public." After the appearance of the first Anti-Concorde Project advertisement in New Scientist, Professor John J. Edsell, of Harvard University, began corresponding with Wiggs. A few months later, Edsell, together with Dr. William A. Shurcliff,

8686-597: The only routes it flew were London – Bahrain , Paris – Rio and Paris – Caracas . Despite the ban, in May 1976 flights were allowed into Washington Dulles International Airport . When the Federal ban was lifted at John F. Kennedy International Airport (JFK), Carol Berman and the Emergency Coalition to Stop the SST , with help from Wiggs, organized opposition which led to New York City imposing its own ban. Nine months later,

8787-453: The practice. SST engines need a fairly high specific thrust (net thrust/airflow) during supersonic cruise, to minimize engine cross-sectional area and, thereby, nacelle drag. Unfortunately this implies a high jet velocity, which makes the engines noisy, particularly at low speeds/altitudes and at take-off. Therefore, a future SST might well benefit from a variable cycle engine , where the specific thrust (and therefore jet velocity and noise)

8888-556: The same size, with more than 300 operations per day at Dubai and London Heathrow , and over 100 in Los Angeles , Singapore , San Francisco , New York-JFK , Frankfurt , and Bangkok . Frequent sonic booms would be heard in Canada, Germany, Iraq, Ireland, Israel, Romania, Turkey, and parts of the United States, up to 150–200 per day or one every five minutes. On August 21, 1961, a Douglas DC-8-43 (registration N9604Z) exceeded Mach 1 in

8989-549: The speed of sound, and Mach numbers for a steadily moving object may change. In water at room temperature supersonic speed means any speed greater than 1,440 m/s (4,724 ft/s). In solids, sound waves can be polarized longitudinally or transversely and have higher velocities. Supersonic fracture is crack formation faster than the speed of sound in a brittle material. The word supersonic comes from two Latin derived words ; 1) super : above and 2) sonus : sound, which together mean above sound, or faster than sound. At

9090-485: The speed of sound. When an inflated balloon is burst, the torn pieces of latex contract at supersonic speed, which contributes to the sharp and loud popping noise. To date, only one land vehicle has officially travelled at supersonic speed, the ThrustSSC . The vehicle, driven by Andy Green , holds the world land speed record, having achieved an average speed on its bi-directional run of 1,228 km/h (763 mph) in

9191-610: The taxpayer funded research and development costs would not be recovered for what he regarded as an "elitist and inherently unsafe" transport. Wiggs corresponded with newspaper editors and other correspondents, disputing claims by the British Aircraft Corporation (the British partner in building the Concorde) and by Government Ministers responsible for the program. Letter-writing only went so far, and so Wiggs began advertising in

9292-591: The temperature of which increases with aircraft speed. As a result the skin of the aircraft gets hotter with increasing supersonic speeds (kinetic heating from the high speed boundary layer ). Heat from the sun also raises the skin temperature. Heat transfers into the aircraft structure which also gets hotter. By the early 1960s many investigations in the United States, Britain and France had shown equilibrium skin temperatures varying from 130 degC at Mach 2.2 to 330 degC at Mach 3. Subsonic aircraft are usually made of aluminium. However aluminium, while being light and strong,

9393-429: The thrust, leading to considerably greater fuel use. This effect is pronounced at speeds close to the speed of sound, as the aircraft is using twice the thrust to travel at about the same speed. The relative effect is reduced as the aircraft accelerates to higher speeds. Offsetting this increase in fuel use was the potential to greatly increase sortie rates of the aircraft, at least on medium and long-range flights where

9494-440: Was actually very successful, and was able to sustain a higher ticket price. Now that commercial SST aircraft have stopped flying, it has become clearer that Concorde made substantial profit for British Airways. Extreme jet velocities used during take-off caused Concorde and Tu-144s to produce significant take-off noise. Communities near the airport were affected by high engine noise levels, which prompted some regulators to disfavor

9595-440: Was claimed to have operated profitably. Throughout the 1950s an SST looked possible from a technical standpoint, but it was not clear if it could be made economically viable. Because of differences in lift generation, aircraft operating at supersonic speeds have approximately one-half the lift-to-drag ratio of subsonic aircraft. This implies that for any given required amount of lift, the aircraft will have to supply about twice

9696-529: Was further testing over Chicago, Milwaukee, and Pittsburgh and finally, in 1966 and 1967 at Edwards Air Force Base in California. Animals were found to react more to the observers than to the sonic booms. Residents submitted claims for hundreds of thousands of dollars in damages from sonic booms for broken windows, cracked plaster, tile and brick. In addition, routine exercises flown by supersonic US Air Force jets resulted in $ 3,800,000 in sonic boom damage claims in

9797-431: Was last flown in 1999 by NASA . Concorde's last commercial flight was in October 2003, with a November 26, 2003 ferry flight being its last flight. Following the termination of flying by Concorde, there have been no SSTs in commercial service. However, several companies have proposed supersonic business jet designs. Small SSTs have less environmental impact and design capability improves with continuing research which

9898-645: Was much less efficient than Concorde's turbojets in supersonic flight. The later TU-144D featured turbojet engines with comparable efficiency. These limitations meant that SST designs were not able to take advantage of the dramatic improvements in fuel economy that high bypass engines brought to the subsonic market, but they were already more efficient than their subsonic turbofan counterparts. Supersonic vehicle speeds demand narrower wing and fuselage designs, and are subject to greater stresses and temperatures. This leads to aeroelasticity problems, which require heavier structures to minimize unwanted flexing. SSTs also require

9999-491: Was only possible outside built up areas, primarily over water, and few airfields were large enough for their takeoff runs. It was also clear that the aircraft was costly to build, and used more fuel per passenger per kilometer than other commercial aircraft at a time of rapidly rising fuel prices. Research by aeronautics engineer Bo Lundberg , Director of the Swedish Aeronautical Research Institute in

10100-560: Was the leader of the ThrustSSC project, however following funding issues in 2018, the team was bought by Ian Warhurst and renamed Bloodhound LSR. Later the project was indefinitely delayed due to the COVID-19 pandemic and the vehicle was put up for sale. Most modern fighter aircraft are supersonic aircraft. No modern-day passenger aircraft are capable of supersonic speed, but there have been supersonic passenger aircraft , namely Concorde and

10201-607: Was unwilling to grant additional flight slots or Fifth freedom rights . The Modern Records Centre, University of Warwick holds a collection of archives of the Anti-Concorde Project, comprising publicity material issued by the Project, 1967–1981, minutes and agendas of the Advisory Committee, and subject files compiled by the Secretary of the Project. The collection also includes press cuttings, reports and publications. The 2003 BBC2 documentary, Concorde – A Love Story aired in

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