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A supersonic aircraft is an aircraft able to fly faster than the speed of sound (Mach number 1). Supersonic aircraft were developed in the second half of the twentieth century and have been used almost entirely for research and military purposes. Only two, Tupolev Tu-144 (first flight - December 31, 1968) and the Concorde (first flight - March 2, 1969), ever entered service for civil use as airliners. Fighter jets are the most common example of supersonic aircraft.
The aerodynamics of supersonic flight is called compressible flow because of the compression (physics) associated with the shock waves or "sonic boom" created by any object travelling faster than sound.
Aircraft flying at speeds above Mach 5 are often referred to as hypersonic aircraft.
The first aircraft to fly supersonically in level flight was the American Bell X-1 experimental plane which was powered by a 6000-lb thrust rocket powered by liquid oxygen and ethyl alcohol. The majority of supersonic aircraft have been military or experimental aircraft.
In the 1960s and '70s, many design studies for supersonic airliners were done and eventually two types entered service, the Soviet Tupolev Tu-144 (1968) and Anglo-French Concorde (1969). However political, environmental and economic obstacles and one fatal Concorde crash prevented them from being used to their full commercial potential.
Supersonic flight brings with it substantial technical challenges, as the aerodynamics of supersonic flight are dramatically different from those of subsonic flight (i.e., flight at speeds slower than that of sound). In particular, aerodynamic drag rises sharply as the aircraft passes the transonic regime, requiring much greater engine power and more streamlined airframes.
To keep drag low, wingspan must be limited, which also reduces the aerodynamic efficiency when flying slowly. Since a supersonic aircraft must take off and land at a relatively slow speed, its aerodynamic design must be a compromise between the requirements for both ends of the speed range.
One approach to resolving this compromise is the use of a variable-geometry wing, commonly known as the "swing-wing," which spreads wide for low-speed flight and then sweeps sharply, usually backwards, for supersonic flight. However, swinging affects the longitudinal trim of the aircraft and the swinging mechanism adds weight and cost. Use of a delta wing, such as those used on the Aerospatiale-BAC Concorde generates a vortex which energises the flow on the upper surface of the wing at high speeds and attack angles, delaying flow separation, and giving the aircraft a very high stall angle. It also solves the issue of fluid compressibility at transonic and supersonic speeds. However, it is, of course, inefficient at lower speeds due to the requirement of a high angle of attack, and therefore need the use of flaps.
Another problem is the heat generated by friction as the air flows over the aircraft. Most supersonic designs use aluminium alloys such as Duralumin, which are cheap and easy to work but lose their strength quickly at high temperatures. This limits maximum speed to around Mach 2.2.
Most supersonic aircraft, including many military fighter aircraft, are designed to spend most of their flight at subsonic speeds, and only to exceed the speed of sound for short periods such as when intercepting an enemy aircraft. A smaller number, such as the Lockheed SR-71 Blackbird reconnaissance aircraft and the Concorde supersonic airliner, have been designed to cruise continuously at speeds above the speed of sound, and with these designs the problems of supersonic flight are more severe.
Some early supersonic aircraft, including the first, relied on rocket power to provide the necessary thrust, although rockets burn a lot of fuel and so flight times were short. Early turbojets were more fuel-efficient but did not have enough thrust and some experimental aircraft were fitted with both a turbojet for low-speed flight and a rocket engine for supersonic flight. The invention of the afterburner, in which extra fuel is burned in the jet exhaust, made these mixed powerplant types obsolete. The turbofan engine passes additional cold air around the engine core, further increasing its fuel efficiency, and supersonic aircraft today are powered by turbofans fitted with afterburners.
Supersonic aircraft usually use low bypass turbofans as they have acceptable efficiency below the speed of sound as well as above; or if supercruise is needed turbojet engines may be desirable as they give less nacelle drag at supersonic speeds. The Pratt & Whitney J58 engines of the Lockheed SR-71 Blackbird operated in 2 ways, taking off and landing as turbojets with no bypass, but bypassing some of the compressor air to the afterburner at higher speeds. This allowed the Blackbird to fly at over Mach 3, faster than any other production aircraft. The heating effect of air friction at these speeds meant that a special fuel had to be developed which did not break down in the heat and clog the fuel pipes on its way to the burner.
Another high-speed powerplant is the ramjet. This needs to be flying fairly fast before it will work at all.
Airflow can speed up or slow down locally at different points over an aircraft. In the region around Mach 1, some areas may experience supersonic flow while others are subsonic. This regime is called transonic flight. As the aircraft speed changes, pressure waves will form or move around. This can affect the trim, stability and controllability of the aircraft, and the designer needs to ensure that these effects are taken into account at all speeds.
Flight at speeds above about Mach 5 is often referred to as hypersonic. In this region the problems of drag and heating are even more acute. It is difficult to make materials which can stand the forces and temperatures generated by air resistance at these speeds, and hypersonic flight for any significant length of time has not yet been achieved.
A sonic boom is the sound associated with the shock waves created whenever an object traveling through the air travels faster than the speed of sound. Sonic booms generate significant amounts of sound energy, sounding similar to an explosion or a thunderclap to the human ear. The crack of a supersonic bullet passing overhead or the crack of a bullwhip are examples of a sonic boom in miniature.
Sonic booms due to large supersonic aircraft can be particularly loud and startling, tend to awaken people, and may cause minor damage to some structures. They led to prohibition of routine supersonic flight over land. Although they cannot be completely prevented, research suggests that with careful shaping of the vehicle the nuisance due to them may be reduced to the point that overland supersonic flight may become a practical option.
A supersonic transport (SST) is a civil aircraft designed to transport passengers at speeds greater than the speed of sound. The only supersonic civilian aircraft to see service were the Soviet produced Tupolev Tu-144 which first flew in 1968 and was retired in 1997; and the Franco-British produced Concorde, which first flew in 1969 and remained in service until 2003. Since 2003, there have been no supersonic civilian aircraft in service.
A key feature of these designs is the ability to maintain supersonic cruise for long periods, so low drag is essential to limit fuel consumption to a practical and economic level. As a consequence, these airframes are highly streamlined and the wings have a very short span. The requirement for low speeds when taking off and landing is met by using vortex lift: as the aircraft slows, lift must be restored by raising the nose to increase the angle of attack of the wing. The sharply swept leading edge causes the air to twist as it flows over the wing, speeding up the airflow locally and maintaining lift.
Other SST projects have included:
- France – Sud Aviation Super-Caravelle
- Russia-United States – Sukhoi-Gulfstream S-21
- Soviet Union – Tupolev Tu-244, Tupolev Tu-444
- United Kingdom – Bristol Type 223
- United States – Convair Model 58-9, Boeing 2707, Lockheed L-2000, Douglas 2229, SAI Quiet Supersonic Transport, High Speed Civil Transport
Supersonic business jetEdit
Supersonic business jets (SSBJ) are a proposed class of small supersonic aircraft. None have yet flown.
Typically intended to transport about ten passengers, SSBJs are about the same size as traditional subsonic business jets.
Projects for both large-scale and business jet (see lower) passenger supersonic and hypersonic airliners (Aerion SBJ, Spike S-512, HyperMach SonicStar, Next Generation Supersonic Transport, Tupolev Tu-444, Gulfstream X-54, LAPCAT, Reaction Engines A2, Zero Emission Hyper Sonic Transport, SpaceLiner, etc.) were proposed and now are under development.
Supersonic strategic bombersEdit
A strategic bomber must carry a large bomb load over long distances. Consequently, it is a large aircraft typically with an empty weight exceeding 25,000 kg. Some have also been designed for related roles such as strategic reconnaissance and anti-shipping strike.
Typically the aircraft will cruise subsonically for most of its flight to conserve fuel, before accelerating to supersonic speed for its bombing run.
Few supersonic strategic bombers have entered service. The earliest type, the Convair B-58 Hustler, first flew in 1956 and the most recent, the Rockwell B-1B Lancer, in 1983. Although this and a few other types are still in service today, none remains in production.
Other types to have flown include:
- Dassault Mirage IV (1959)
- Tupolev Tu-22 (1959)
- Myasishchev M-50 (1959)
- BAC TSR-2 (1964)
- North American XB-70 Valkyrie (1964)
- Tupolev Tu-22M (1969)
- General Dynamics FB-111A (1969)
- Sukhoi T-4 (1972)
- Tupolev Tu-160 (1981)
- Rockwell B-1B Lancer (1986)
Out of these, only the Tu-22, Tu-22M, FB-111A, B-1B, and Tu-160 entered production. A next-generation stealthy supersonic strategic bomber is being planned in United States under the 2037 Bomber project.
Supersonic strategic reconnaissanceEdit
Some supersonic strategic bombers, such as the Sukhoi T-4 are also capable of the reconnaissance role (although the Sukhoi remained a prototype).
Supersonic fighter/attack jetsEdit
Supersonic fighters and related aircraft are sometimes called fast jets. They make up the overwhelming majority of supersonic aircraft and some, such as the Mikoyan-Gurevich MiG-21, Lockheed F-104 Starfighter and Dassault Mirage III, have been produced in large numbers.
Many military supersonic fighters and similar aircraft of fourth- and fifth- generations are under development in several countries, including Russia, China, Japan, South Korea, India, Iran and the United States.
- Douglas F4D Skyray (1951)
- North American F-100 Super Sabre (1953)
- Convair F-102 Delta Dagger (1953)
- Grumman F-11 Tiger (1954)
- McDonnell F-101 Voodoo (1954)
- Lockheed F-104 Starfighter (1954)
- Republic F-105 Thunderchief (1955)
- Vought F-8 Crusader (1955)
- Convair F-106 Delta Dart (1956)
- Douglas F5D Skylancer (1956)
- Grumman F11F-1F Super Tiger (1956)
- North American F-107 (1956)
- North American A-5 Vigilante (1958)
- McDonnell Douglas F-4 Phantom II (1958)
- Vought XF8U-3 Crusader III (1958)
- Northrop F-5A/B Freedom Fighter (1959)
- Lockheed YF-12 (1963)
- General Dynamics F-111 Aardvark (1964)
- General Dynamics–Grumman F-111B (1965)
- Grumman F-14 Tomcat (1970)
- McDonnell Douglas F-15 Eagle (1972)
- Northrop F-5E/F Tiger II (1972)
- Northrop YF-17 (1974)
- General Dynamics F-16 Fighting Falcon (1974)
- McDonnell Douglas F/A-18 Hornet (1978)
- Northrop F-20 Tigershark (1982)
- Vought YA-7F (1989)
- Lockheed YF-22 (1990)
- Northrop YF-23 (1990)
- Boeing F/A-18E/F Super Hornet (1995)
- Lockheed Martin F-22 Raptor (1997)
- Lockheed Martin X-35 (2000)
- Boeing X-32 (2000)
- Lockheed Martin F-35 Lightning II (2006)
- Mikoyan-Gurevich MiG-19 (1953)
- Mikoyan-Gurevich MiG-21 (1955)
- Sukhoi Su-7 (1955)
- Sukhoi Su-9 (1956)
- Sukhoi Su-11 (1958)
- Yakovlev Yak-28 (1958)
- Yakovlev Yak-27 (1960)
- Tupolev Tu-28 (1961)
- Sukhoi Su-15 (1962)
- Mikoyan-Gurevich MiG-25 (1964)
- Sukhoi Su-17 (1966)
- Sukhoi Su-24 (1967)
- Mikoyan-Gurevich MiG-23 (1967)
- Mikoyan MiG-27(1970)
- Yakovlev Yak-38 (1971)
- Mikoyan MiG-31 (1975)
- Sukhoi Su-27 (1977)
- Mikoyan-Gurevich MiG-29 (1977)
- Sukhoi Su-33 (1987)
- Yakovlev Yak-141 (1987)
- Sukhoi Su-30 (1989)
- Sukhoi Su-34 (1990)
- Sukhoi Su-37 (1996)
- Sukhoi Su-47 (1997)
- Mikoyan Project 1.44 (2000)
- Mikoyan MiG-35 (2007)
- Sukhoi Su-35 (2008)
- Sukhoi Su-57 (2010)
- Dassault Mirage III (1956)
- Leduc 022 (1957)
- Dassault Mirage III V (1961)
- Dassault Mirage IV (1964)
- Dassault Mirage F1 (1966)
- Dassault Mirage 5 (1967)
- Dassault Mirage G (1971)
- Dassault-Breguet Super Étendard (1974)
- Dassault Mirage 2000 (1978)
- Dassault Mirage 4000 (1979)
- Dassault Rafale (1986)
- Shenyang J-6 Farmer (1958)
- Nanchang Q-5 Fantan (1965)
- Chengdu J-7 Fishbed (1966)
- Shenyang J-8 (1969)
- Nanchang J-12 (1970)
- Xian JH-7 Flounder (1988)
- Chengdu J-10 Vigorous Dragon (1998)
- Shenyang J-11 (1998)
- Nanchang/Hongdu L-15 (2005)
- Shenyang J-15 Flying Shark (2009)
- Chengdu J-20 stealth (2011)
- Shenyang J-16 (2012)
- Shenyang J-21/J-31 Gyrfalcon (2012)
- EWR VJ 101 (1963)
- Helwan HA-300 (1964)
- Aeritalia F-104S Starfighter (1966)
- SEPECAT Jaguar (1968)
- Panavia Tornado (1974)
- Atlas Cheetah (1986)
- AIDC F-CK-1 Ching-kuo (1989)
- Eurofighter Typhoon (1994)
- KAI T-50 Golden Eagle (2002)
- PAC JF-17 Thunder (2003)
Supersonic research aircraftEdit
- Bell X-1 (1946), first to break the sound barrier in level flight. Rocket powered.
- Douglas D-558-2 Skyrocket (1948), Rocket powered.
- Convair XF-92 (1948), First delta-wing supersonic jet.
- Republic XF-91 Thunderceptor (1949), mixed power
- Bell X-2 (1952), Rocket powered.
- Convair F2Y Sea Dart (1953), only seaplane to exceed speed of sound
- SNCASO Trident (1953), French supersonic twin engine research aircraft.
- Fairey Delta 2 (1954), first to exceed 1,000 miles per hour.
- Nord Gerfaut (1954), French built delta wing supersonic research aircraft.
- SNCASE SE.212 Durandal (1956), experimental French built delta wing supersonic fighter.
- Nord 1500 Griffon (1955, 1957), Griffon 1 flew in 1955, Griffon 2 flew in 1957, experimental mixed turbojet-ramjet fighter.
- Saunders-Roe SR.53 (1957), experimental mixed power jet fighter
- North American X-15 (1959), first hypersonic aircraft and spaceplane. Rocket powered.
- Bristol 188 (1962), British supersonic research aircraft
- Lockheed NF-104A (1963) modified F-104 Starfighter used for training astronauts for North American X-15 and Boeing X-20 Dyna-Soar programs.
- Northrop HL-10 (1966), rocket powered
- Martin Marietta X-24A (1969) rocket powered.
- Northrop M2-F3 (1970) rocket powered
- General Dynamics F-16XL (1982) modified F-16, delta wing test demonstrator
- Grumman X-29 (1984)
- McDonnell Douglas F-15 STOL/MTD (1988) heavily modified F-15 used in several NASA test programs including, STOL/MTD, ACTIVE, IFCS, Quiet Spike, SBRDC/ECANS, and HISTEC.
- Rockwell-MBB X-31 (1990)
- General Dynamics F-16 VISTA (1992) modified F-16, thrust vector control demonstrator
- Shaped Sonic Boom Demonstration (2003)
- SpaceShipOne (2003) first privately designed space plane
- NASA X-43 (2004) scramjet powered demonstrator
- Boeing X-53 Active Aeroelastic Wing (2006) modified F-18, wing warping demonstrator. Was also used as the High Alpha Research Vehicle and more recent sonic boom research.
- Boeing X-51 Waverider (2010) scramjet powered demonstrator
- Lockheed Martin X-59 QueSST (2018) commissioned by NASA
- Gunston, Bill (2008). Faster than Sound: The Story of Supersonic Flight. Somerset, UK: Haynes Publishing. ISBN 978-1-84425-564-1.
- Haering, Edward A., Jr.; Smolka, James W.; Murray, James E.; Plotkin, Kenneth J. (January 1, 2005). "Flight Demonstration Of Low Overpressure N-Wave Sonic Booms And Evanescent Waves" (PDF). NASA Technical Reports. NASA. Retrieved February 12, 2015.
- Mike May, Crackin' Good Mathematics, American Scientist, Volume 90, Number 5, 2002
- Banke, Jim (28 June 2018). "NASA's experimental supersonic aircraft now known as X-59 QueSST". SPACE DAILY. Space Media Network. Retrieved 2018-06-30.