dry and with afterburning. Mk.100 Derated to Mk.101 Mk.701 Rated at , the Mk.701 was used in the production Folland Gnat F Mk.1 for Finland and India. Mk.703 Rated at ; powered the Hindustan HF-24 Marut Mk.1. Mk.703R Reheated Mk.703 rated at powered the production version of the Hindustan HF-24 Marut. Reheat system developed by Hindustan Aeronautics Limited Mk.801 Rated at , powering G.91s. The Mk.801 was identical to the BOr.2 engine except for accessories. Mk.803 With improvements to the compressor, rated at , replaced earlier marks used in G.91s. Mk.805 de-rated to , powered Fuji T1F1 prototype and T-1A production aircraft, as well as the Hunting H.126 jet-flap research aircraft. FIAT 4023 Mk.803 engines Licence built by FIAT. FIAT 4023 Mk.803 engines Licence built by FIAT with added fire detection system. Applications Aircraft Breguet Taon Fiat G.91 Folland Gnat Fuji T-1 HAL HF-24 Marut Helwan HA-300 Hunting H.126 Short SB5 Other applications Orpheus engines, numbers 709 (destroyed by FOD in testing) and 711 (running) powered the Bluebird K7 hydroplane in which Donald Campbell was killed whilst attempting the water speed record on Lake Coniston in 1967. A dragster powered by an Orpheus, the "Vampire", is the current holder of the British land speed record. Engines on display Preserved Bristol Siddeley Orpheus engines are on display at Aerospace Bristol, at the Midland Air Museum, Coventry, and at Solent Sky, Southampton. One is also preserved as a relic in India's first aerospace museum in Hindustan Aerospace Heritage Centre, Bangalore. Specifications (Orpheus BOr.3 / Mk.803) See also Notes References External links Flight Global online archive - Detailed description of the Orpheus, November 1957. "Orpheus" a 1959 Flight article 1950s turbojet engines Orpheus