Hawker Siddeley P.1127 Hawker Siddeley P.1127 The Hawker P.1127 and the Hawker Siddeley Kestrel FGA.1 are the experimental and development aircraft that led to the Hawker Siddeley Harrier, the first "vertical and/or short take-off and landing" (V/STOL) jet fighter-bomber. P.1127 development began in 1957, taking advantage of the Bristol Engine Company's choice to invest in the creation of the Pegasus vectored-thrust engine. Testing began in July 1960 and by the end of the year the aircraft had achieved both vertical take-off and horizontal flight. The test program also explored the possibility of use upon aircraft carriers, landing on in 1963. The first three
Engine failure on take-off a stop when accelerating through V1 during the take-off run, the take-off must be continued even in the event of an engine failure. The take-off weight will have been limited to ensure it is safe to continue take-off with one engine inoperative after having accelerated to V1 with all engines operating. Engine failure on take-off Engine failure on take-off (EFTO) is a situation, when flying an aircraft, where an engine has failed, or is not delivering sufficient power, at any time between brake release and the wheels leaving the ground / V. The phases of flight are de-lineated to allow