| abstract
| - The HL-10 suffered from several problems on its first flight and was grounded for over a year while its design was adjusted. The revised HL-10 proved to be the most successful of the lifting bodies, enjoying greater stability and control dynamics than its predecessor and operating for 36 flights between 1968-73. The M2-F2 suffered from stability problems that led to Pilot Induced Oscillation, or "dutch roll", and on its 16th flight in 1967 crashed in a spectacular accident that was caught <a href="http://bionic.wikia.com/wiki/Image:Crash.JPG#file">http://bionic.wikia.com/wiki/Image:Crash.JPG#file</a> on film. Pilot Bruce Peterson rolled in the M2-F2 six times and was seriously injured, ultimately losing sight in one eye. Present at Edwards AFB that day was aviator and novelist Martin Caidin, who would be inspired to write a fictionalized account of the event. The M2-F2 was rebuilt as the M2-F3, which adopted some characteristics of the HL-10 (note that as prototypes, there were only ever one of each aircraft, thus "The M2-F2" not "an M2-F2") which flew 27 times as the modified HL-10's contemporary. Meanwhile yet more radical designs were developed, namely the Martin Marietta X-24A in 1969, and in 1972-3 its striking evolution the X-24B.
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