Armstrong Siddeley Sapphire
Wright J65

In 1947, the Metrovik F.9 Sapphire was handed to Armstrong Siddeley. Armstrong Siddeley improved the engine's thrust from 7,500 lb to 11,000 without afterburning (augmentation) over its production life.
To gain entry into the turbojet market, Wright purchased a license to build the Sapphire (re-designated the J65). The engine was Americanized and redesigned...a process which took two years longer than expected. By then the market had been taken over by the Pratt & Whitney J57.


  • J65-W-2: 7,800 lb (34.7 kN) thrust
  • J65-W5: 7,200 lb (32.1 kN) thrust
  • J65-W-16A: 7,700 lb (34.2 kN) thrust
  • J65-W-18: 7,450 lb (33.1 kN) thrust


  • Turbojet
  • Compressor: 13-stage
  • Turbine: 2-stage 

used by

  • Douglas A4D Skyhawk
  • Martin B-57 Canberra
  • Grumman F11F Tiger
  • Republic F-84F Thunderstreak
  • North American FJ-2 Fury