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Ref : S04998
Theme :
Aviation-NASA aircrafts-Prototypes (1538 images)
Title : X-31 Quasi-Tailless (Artist Concept)
Caption :
This is a computer enhanced artist's concept of a semi-tailless X-31 Enhanced Fighter Maneuverability Aircraft in flight. In 1994, software was installed in the X-31 to demonstrate the feasibility of stabilizing a tailless aircraft at supersonic speed, using thrust vectoring. This software allowed destabilization through the control laws of the aircraft in incremental steps to the goal of simulation 100 percent tail-off. Quasi-tailless tests began in 1994. The first phase started with supersonic evaluations at Mach 1.2. Later subsonic evaluations were performed. During the flights the aircraft was destabilized with the rudder to stability levels that would be encountered if the aircraft had a reduced size vertical tail.
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