|
In 1957, NASA had investigated the problems
associated with re-entry from space of missile nose cone. Engineers
conceived the lifting body idea that by modifying a cone shape,
aerodynamic lift could be produced to fly back from space rather than
plunge to the earth. This study led to the design known as the M-2, a "M"odified half-cone, rounded on bottom and flat on top, with twin tail-fins. This configuration allowed lifting body to be landing on a runway rather than parachuting into the ocean. In 1962, NASA built the first lifting prototype, the unpowered
M2-F1. With the success of M2-F1 program, NASA signed contract to Northrop
to build the M2-F2. The first glide flight was tested in 1966. The
following flights had been unqualified success until the 16th flight at
Edwards AFB, a control accident took place on landing that resulted in
crash and pilot injuries. Northrop disassembled the M2-F2 and repaired to
service as the M2-F3. In 1970, U.S. Air Force jointed the program. The Air
Force pilot tested several powered flights and made the first supersonic
flight in 1971. Over a year later, M2-F3 was completed 27 flights and then
retired at the end of 1972.
|
