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Aviation History
1973
1973 - 0041.PDF
FLIGHT International, 4 January [973 Pratt & Whitney TF30 (USA) Augmented two-shaft turbo- fan. It is the most widely used augmented turbofan in the US, powering all versions of General Dynamics' F-lll (in production until December 1974), and as the 20,6001b TF30-PW- 412 is installed in the Grumman F-14A Tomcat. It is also used, without afterburning, in the LTV A-7A, A-7B and some A-7Es. TF30-P-3 Three-stage fan plus six-stage 1-p compressor, seven-stage h-p compressor, annular corabustor, single-stage h-p turbine, three-stage 1-p turbine, afterburner with fully variable ejector nozzle. Take-off 10,7501b dry, 18,5001b with afterburner; mass flow 2331b/sec; pressure ratio 17:1; length 242in; diameter 38in; weight 4,0601b. Volvo Flygmotor RM8 (Sweden) Augmented two-shaft turbofan. Based on the Pratt & Whitney JT8D-1 subsonic commercial turbofan coupled with a Flygmotor afterburner, this engine first ran in the summer of 1964 as the RM8A power unit for Saab's Viggen attack aircraft. Some 50 RM8A engines have been delivered; the total contract is for 195. Development was started in 1970 of the higher-rated RM8B version for the new Viggen fighter; changes introduced reflect increased use of maximum augmented power and high- altitude operation. Ratings of RM8B are 16,2001b dry and 28,1001b with afterburner. RM8A Two-stage fan and four-stage 1-p compressor, annu lar combustor, single-stage h-p turbine, three-stage 1-p turbine, close-coupled afterburner with variable convergent nozzle. Take-off 14,7351b dry, 25,9701b with afterburner; bypass ratio 1-05:1; length 242-5in; diameter 52-8in; weight 5,1801b. Of the three new American engines in the 20,0001b-30,0001b sector, the F100 is coming near to getting into production, though being hampered somewhat by the lack of a full parallel programme with the US Navy F401 version. The F100 also has the best chance of a second and possibly even third application via the YF-16 light fighter and projected IMI aircraft. The status of the F100, in addition, may be helped to some extent by use of the F401 in the new V/Stol fighter for the USN's Sea Control Ship programme. The GF F101 is a firm proposition, but its B-1A application still remains a slightly controversial project. There are no signs of the expected parallel Russian development of augmented turbofans. Detroit Diesel Allison/Rolls-Royce TF41 (US & UK) Two- shaft turbofan. Based on the Rolls-Royce RB.168-25 Spey, the TF41 is in production to power the LTV A-7D and some A-7Es. Of 900 TF41s on order for A-7s, 400 or so are still to be delivered. A new variant, the YA-7H, flew in September last year with a TF41 to extend the performance of the basic aircraft. The rating of this engine is expected to be raised to 17,5001b dry. TF41-A-2 Three-stage fan and two-stage 1-p compressor, 11- stage h-p compressor, annular combustor, two-stage h-p and 1-p turbines. Take-off 15,0001b; mass flow 2631b/sec; pressure ratio 21-4:1; length 102-6in; diameter 37-5in; weight 3,1751b. General Electric J79 (USA) Augmented single-shaft turbo jet. It is the major US Mach 2 turbojet, with extensive appli cation in the Lockheed F-104 and McDonnell Douglas F-4. Manufacture is licensed to Mortoren-und Turbinen-Union, Ishikawajima-Harima Heavy Industries, Fabrique Nationale, Fiat and Orenda. Well over 13,000 J79s have been built. J79-GE-17 Seventeen-stage compressor, annular compressor, 31 Volvo Flygmotor's RM8 is the most powerful augmented turbofan engine in the western world, though application will probably be limited by political factors to the Viggen three-stage turbine, close-coupled afterburner with variable convergent-divergent nozzle. Take-off 11,8701b dry, 17,9001b with afterburner; mass flow 1701b/sec; pressure ratio 13-5:1; length 208-7in; diameter 39-lin; weight 3,8351b. 10,0001b, 44.5kN-20,0001b, 89kN AL-5 •'•'••-" ' : •:••••---•-•-• I AL-7 warn'- , ' — •-. -..y^^i Ajar 08 & 09 IT R-11.,.,.,.,. . ..:,...... ..... , . ...... ,..,..,.] RBI99^:.^;. T^^ 20,000 lb General Electric J101 (USA) Augmented single-shaft "leaky" turbojet. Initiated by GE as a private-venture engine, the J101 was awarded a USAF development contract in April last year for the twin-engined Northrop YF-17/P-600 light weight fighter. The high-pressure gas generator was tested in March and the complete engine in July. The Prototype- Preliminary Flight Rating Test (P-PFRT) is planned for late 1973, the first flight of this fighter being due early next year. Other applications include the Northrop P-530 Cobra and a projected Boeing remotely piloted reconnaissance vehicle. YJ101-GE-100 Ten-stage compressor, annular combustor, two- stage turbine, close-coupled afterburner. Take-off 15,0001b with afterburning; pressure ratio more than 20:1; length 142in; diameter 32in. Lyulka AL-5 (USSR) Augmented turbojet. A fighter engine with dry ratings of 10,1401b and 11,0231b. Lyulka AL-7 (USSR) Augmented turbojet. A basic engine with dry ratings of 14,3301b and 15,4301b. Among other appli cations is the Beriev M-10 patrol flying boat. The R-R/P&W TF4I has earned high praise from the American Services for its combat reliability
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