I don't agree with the label; but there can be no isolationists anywhere when a thermonuclear warhead can flash down from space at hypersonic speed to reach any spot on Earth minutes after its launching ".
42.
Augenstein also participated in a RAND study on the proposed National Aerospace Plane ( NASP or Rockwell X-30 ), a vehicle that could go into orbit as well as travel over intercontinental ranges at hypersonic speeds.
43.
Three X-43A's are to make hypersonic test flights over 18 months, starting on June 2, from Edwards Air Force Base, Calif . Hypersonic speeds are those above Mach 5, or five times the speed of sound.
44.
Coincidentally, the shape of the nose of an axisymmetric projectile that gives it the least possible aerodynamic drag at hypersonic speeds always has a meplat, the diameter of which depends on the length of the nose.
45.
His discoveries 40 years ago about the effects of structure on turbulent flow laid the foundation for him and fellow engineers to move from low-speed aerodynamics through high subsonic and on to supersonic and hypersonic speeds.
46.
He applied and generalized these theoretical developments to the design of early American spacecraft and ballistic missiles to enable their reentry into the earth s atmosphere without destruction from the high temperatures generated by their hypersonic speeds.
47.
An even larger booster took the missile to hypersonic speeds while still in the lower atmosphere, so the missile fuselage had to be covered over completely with a phenolic ablative heat shield to protect the airframe from melting.
48.
Unlike a rocket that quickly passes mostly vertically through the atmosphere or a turbojet or ramjet that flies at much lower speeds, a hypersonic airbreathing vehicle optimally flies a " depressed trajectory ", staying within the atmosphere at hypersonic speeds.
49.
The latest flight marks the end of NASA's Hyper-X Program, an effort that has used wind tunnel research, computer modeling and flight data to prove the possibility of flying at hypersonic speeds, those greater than five times the speed of sound.
50.
Thus jet engines, with a better match between speed and jet exhaust speed ( such as turbofans in spite of their worse \ eta _ c ) dominate for subsonic and supersonic atmospheric use, while rockets work best at hypersonic speeds.
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