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Aviation History
1973
1973 - 0043.PDF
FLIGHT International, 4 January 1973 33 1-p turbines. Take-off 7,8601b; bypass ratio 5-7:1; mass flow 2751b/sec; length 56-8in; diameter 49-5in; weight approxi mately 1,1601b. General Electric TF34 (USA) Two-shaft turbofan. Initially launched in 1969 to power Lockheed's S-3A Viking ship-board anti-submarine aircraft for the US Navy, the TF34 has sub sequently been chosen for Boeing's E-3A Airborne Warning and Control System (Awacs), Lockheed's winning entry in Nasa's Questol contest, and Fairchild Industries' A-10A entry in the USAF's A-X competition (yet to be decided). The TF34 was cleared for quantity production at the end of last year for the S-3A, which is scheduled to enter service with the US Fleet in February next year. TF34-GE-2 Single-stage fan, 14-stage h-p compressor, annular combustor, two-stage h-p turbine, four-stage 1-p turbine. Take off 9,2751b; bypass ratio 6-23:1; mass flow 3381b/sec; length lOlin; diameter 50in; weight 1,4211b. General Electric J97 (USA) Augmented single-shaft turbo jet. Derived from the GE1/J1 series of turbojets (utilising the 5,0001b GE1 core engine), the J97 is a USAF financed high- performance turbojet of compact design, originally intended for light attack fighters and subsequently employed as a drone engine. Applications include the Teledyne Ryan Aero nautical AQM-91A high-altitude, long-range drone, Boeing's drone for the Compass Cope programme, and a Nasa V/Stol research vehicle. YJ97-GE-100 Fourteen-stage compressor, annular combustor, two-stage turbine, afterburner. Take-off 5,2701b dry, 7,0001b/ 8,0001b with afterburner; pressure ratio 24-4:1; length 109-5in; diameter 24-4in; weight 6941b. Rolls-Royce/Turbomeca RB.172-T.260 Adour (UK & France) Augmented two-shaft turbofan. The Adour is in production (as Mks 101 and 102) to power the Jaguar, with 500 engines on order for the RAF and French Air Force. It is also flying in Fuji's T-2, for which Ishikawajima-Harima Heavy Industries holds the Adour licence. The engine has been chosen, as the RT.172-06 Mk 151 without afterburner, for the Hawker Siddeley HS.1182 trainer on order for the RAF; this version is scheduled to start test runs early this year. Rating for the Mk 151 is 5,2001b. The Mk 102 version is equipped with part- throttle reheat extending from minimum dry to maximum afterburning thrust. Adour Mk 102 Two-stage fan, five-stage h-p compressor, annular combustor, single-stage h-p and 1-p turbines, close- coupled afterburner with variable convergent-divergent nozzle. Take-off 4,6201b dry, 7,3801b with afterburner; bypass ratio 1:1; pressure ratio 9-6:1; length 117in; diameter 22in; weight 1,3201b. Currently one of the most interesting sectors, the 5,0001b- 10,0001b bracket has a quartet of new and relatively new engines, with the F102 trying to make a breakthrough for Lycoming into military fixed-wing propulsion, but pitted against the might of GE. Although the competing TF34 is established in a number of existing applications, success in the A-X contest offers the particular attraction of a large and long production run with, presumably, export potential (in the A-I0A) which the engine's other applications lack. The other GE engine, the J97, remains something of a mystery, being closely associated with RPVs. The Adour is well along the road, and now has only to prove itself in service. With its installation in two export- worthy applications, the Anglo-French engine offers long-term possibilities to both its parent manufacturers, plus the chance for further development as the core engine for higher-bypass- ratio commercial turbofans. 2,5001b, 11 kN-5,0001b, 225kN J85 AI-25TL,NV. ^ Viper 500 Viper 600 N" Larzac04 [J 100" S /\\XX\x II III ..N^.SNJ in . ,77777^7^ ;\7777l ^»^ Model 490/USLarzac? with licensed manufacture also by Alfa Romeo and Orenda. The J85 has also been used as gas generator/turbojet for GE lift-fan installations. Well over 8,000 J85s have been built, and nine million hours flown in its major applications, the Northrop T-38 and F-5 series. Current installations include the 5,0001b J85-GE-21 in the F-5E, for which the USAF has ordered 325 for SE Asia, the 2,4001b J85-GE-17A for Cessna's A-37B, the 2,7201b J85-GE-13A for the Fiat G.91-R-3, and the 2,8501b J85-GE-17B for Saab's 105XT and 105G. J85-GE-21 Nine-stage compressor, annular combustor, two- stage turbine, afterburner with fully variable convergent- divergent nozzle. Take-off 3,5001b dry, 5,0001b with afterburner; mass flow 52-51b/sec; pressure ratio 8-1:1; length 112-5in; diameter 21in; weight 6701b. Motorlet AI-25 (Czechoslovakia) Geared two-shaft turbofan. The Ivchenko AI-25 commercial turbofan is licence-built by Motorlet for the Aero L-39 trainer in an uprated 3,7841b form and as a 4,4001b advanced version, named Walter Sirius, for the L-39 strike and light ground-attack developments. AI-25W Three-stage fan/l-p compressor, eight-stage h-p com pressor, annular combustor, single-stage h-p turbine, two- stage 1-p turbine. Take-off 3,3001b; bypass ratio 2-0:1; mass flow 331b/sec; pressure ratio 8-0:1; length 76-5in; diameter 23-6in; weight 6401b. Rolls-Royce Viper 500 series (UK) Single-shaft turbojet. Built in large numbers, including licence-manufacture by Piaggio, Hindustan Aeronautics, Atlas Aircraft and Common wealth Aircraft Corp, for trainers and light strike aircraft. Current applications include the 3,4101b Viper 535 in the BAC 167 Strikemaster, 2,5001b Viper 11 in the HAL HJT-16 Mk I Kiran and 3,0001b Viper 531 in the Soko J-l Jastreb. Viper 535 Eight-stage compressor, annular combustor, single-stage turbine. Take-off 3,3601b; mass flow 52-81b/sec; pressure ratio 5-6:1; length 92-2in; diameter 19-3in; weight 7601b. Rolls-Royce Viper 600 Series (UK) Single-shaft turbojet. Developed in collaboration with Fiat (which has a 27 per cent share in the project), the military version is flying as the 4,0001b Viper 623-43 in Aermacchi's MB.326K. Future projected developments include an afterburning Viper 600R, and Viper 700, both of about 5,5001b thrust. Viper 600 Eight-stage compressor, annular combustor, two- stage turbine. Take-off 4,0001b; mass flow 58-41b/sec; pressure ratio 5-8:1; length 85-2in; diameter 24-5in; weight 7601b. Snecma/Turbomeca Larzac 04 (France and Germany) Two- shaft turbofan. It is under development by Snecma and Turbo- meca for the twin-engined Dornier/Dassault-Breguet TA-510 Alpha Jet. Initial flight-testing was in a modified Lockheed Constellation, but the follow-on test programme has been delayed by the recent crash of the prototype Falcon 10, which was planned as a flying test-bed. Manufacture of the Larzac 04 is to be shared 60 per cent by French companies and 40 per cent by MTU and KHD. The engine is licensed to Teledyne CAE as the Model 4904, initially for RPV and drone applica tions; there is also a possibility of installing it in the Aer- GE's TF34 turbofan has been selected for the S-3A Viking, the eight- engined Awacs design, Nasa's Questol and the A-10A. Volume produc tion, however, would be significantly increased by the award of the A-X contract 5,0001b General Electric J85 (USA) Augmented single-shaft turbo jet. It is extensively installed in light fighters and trainers,
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