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In aerodynamics, compression lift refers to the increased pressure under an aircraft that uses shock waves generated by its own
/ref> The basic concept of compression lift is well known; " planing" boats reduce drag by "surfing" on their own bow wave in exactly the same fashion. Using this effect in aircraft is more difficult, however, because the "wake" is not generated until supersonic speeds are reached, and is highly angled. Aircraft have to be carefully shaped to take full advantage of this effect. In addition, the angle of the shock waves varies greatly with speed, making it even more difficult to design a craft that gains significant lift over a wide range of speeds. Higher speed designs using compression lift, waveriders, remain an interesting possibility for
The Bird is on the Wing: Aerodynamics and the Progress of the American AirplaneThe Story of the Boeing Company By Bill Yenne, William YenneBomber R&D Since 1945: The Role of Experience By Mark A. Lorell, Alison SaundersHypersonic Vehicle Design
Aerodynamics {{Aviation-stub
In aerodynamics, compression lift refers to the increased pressure under an aircraft that uses shock waves generated by its own supersonic
Supersonic speed is the speed of an object that exceeds the speed of sound ( Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately . Speeds greater than five times ...
flight to generate lift. This can lead to dramatic improvements in lift for supersonic
Supersonic speed is the speed of an object that exceeds the speed of sound ( Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately . Speeds greater than five times ...
/hypersonic
In aerodynamics, a hypersonic speed is one that exceeds 5 times the speed of sound, often stated as starting at speeds of Mach 5 and above.
The precise Mach number at which a craft can be said to be flying at hypersonic speed varies, since in ...
aircraft. Clarence Syvertson Clarence A. "Sy" Syvertson (1926-2010) was the Center Director of the Ames Research Center of the National Aeronautics and Space Administration, located at Moffett Field, California.
Syvertson was born in Minneapolis, Minnesota in 1926. He gradu ...
and Alfred J. Eggers
Alfred J. Eggers, Jr. (June 24, 1922 – September 22, 2006) was NASA's Assistant Administrator for Policy and devoted efforts to determine the influence of aviation technology in world peace and lectured widely.
Eggers specialized in hypers ...
discovered this phenomenon in 1956 as they analyzed abnormalities at the reentry of nuclear warheads.Compression Lift/ref> The basic concept of compression lift is well known; " planing" boats reduce drag by "surfing" on their own bow wave in exactly the same fashion. Using this effect in aircraft is more difficult, however, because the "wake" is not generated until supersonic speeds are reached, and is highly angled. Aircraft have to be carefully shaped to take full advantage of this effect. In addition, the angle of the shock waves varies greatly with speed, making it even more difficult to design a craft that gains significant lift over a wide range of speeds. Higher speed designs using compression lift, waveriders, remain an interesting possibility for
hypersonic
In aerodynamics, a hypersonic speed is one that exceeds 5 times the speed of sound, often stated as starting at speeds of Mach 5 and above.
The precise Mach number at which a craft can be said to be flying at hypersonic speed varies, since in ...
vehicle designs, although only testbed models have been flown. The Boeing X-51 ( WaveRider) also uses compression lift.
References
External links
The Bird is on the Wing: Aerodynamics and the Progress of the American Airplane
Aerodynamics {{Aviation-stub