Flight envelope
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Flight Envelope - An aircraft's performance limits, specifically the curves of speed plotted against other variables to indicate the limits of speed, altitude, and acceleration that a particular aircraft cannot safely exceed.
An inlet must operate efficiently over the entire flight envelope of the aircraft. At very low aircraft speeds, or when just sitting on the runway, free stream air is pulled into the engine by the compressor.
The Army Air Force was unhappy with the cautious pace of flight envelope expansion and Bell Aircraft' ...
 See also: Aircraft, Speed, Envelope, Power, Flight
  
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