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Aviation History
1973
1973 - 0035.PDF
FLIGHT International, 4 January 1973 27 mark by powering major new designs from the main business- aircraft manufacturers. The Astafan, by contrast, seems more orientated towards the re-engining of existing piston or turboprop aircraft. CIVIL SHAFTPOWER 5,000 s.h.p., 3,730kW-15,000 s.h.p., 11,185kW 15,000 s.h.p. Avco Lycoming LTC4 series (USA) Free-turbine turboshaft and turboprop. Three groups of engines form the LTC4 series —the LTC4B and LTC4V turboshafts and LTC4R turboprop- all of which are discussed under the military designation T55. The power bracket extends from 3,750 h.p. up to 10,000 h.p. Kuznetsov NK-12 (USSR) Single-shaft turboprop. This, the world's most powerful turboprop, drives eight-bladed contra- rotating propellers in its sole civil application, the Tupolev Tu-114. r NK-12MV Fourteen-stage compressor, cannular combustor, five-stage turbine. Forward-mounted integral gearbox. Take-off 15,000 e.h.p.; mass flow 1371b/sec; length 236-2in; diameter 45-3in; weight 5,0701b. Rolls-Royce/Snecma M57H (UK & France) Free-turbine turboshaft. Proposed for use in heavy-lift helicopters, the M57H (RB.411) comprises the M45H turbofan with a cropped fan acting as zero-stage compressor and omits the 1-p turbine third stage. An additional two-stage power turbine provides the output drive. The basic rating is 8,750 s.h.p. Soloviev D-25V (USSR) Free-turbine turboshaft. The power unit for the Mil Mi-6, Mi-10 and Mi-12 helicopters, and is also fitted to the Kamov Ka-22 experimental convertible. The alternative engine designation is TB-2BM. D-25V Nine-stage compressor, cannular combustor, single- stage compressor turbine, two-stage power turbine. Direct drive. Take-off 5,500 e.h.p.; pressure ratio 5-6:1; length 107-8in; weight 2,6451b. The lack of significant activity in this sector confirms the general decline of the medium- and high-power turboprop brought about by the introduction first of the turbojet and later the turbofan. The shaft-power turbine, however, con tinues to hold its own as the main form of helicopter prime mover. Although at present there seems little likelihood of the M57H coming to fruition, the use of a proven gas genera tor from a turbofan or turbojet is a realistic one, being simply the reverse process by which the T55 turboshaft led to the ALF-502 turbofan. Model of the TPE33I, Garrett's top-selling engine United Aircraft of Canada's JTI5D has made its commercial debut in the Cessna Citation and will power the Aerospatiale Corvette 2,500 s.h.p., 1,865kW-5,000 s.h.p., 3,730kW Model 5011 CT64;; AI-20 AI-24 JFTD12 Dart 5,000 s.h.p. Detroit Diesel Allison Model 501 (USA) Single-shaft turbo prop. The commercial counterpart of the T56, and the sole US turboprop to enter airline service. Recent installations have included various Aero Spacelines conversions of Boeing Stratocruisers such as the Guppy-201 and Super Guppy, each powered by four 4,050 e.h.p. Model 501-D22Cs. General Electric CT64 (USA) Free-turbine turboprop. The commercial counterpart of the T64, and in its 3,055 e.h.p. CT64-820-1 version it powers the de Havilland Canada DHC-5 Buffalo. Also, as 3,060 e.h.p. CT64-820-2, it is proposed for the Aeritalia (Fiat) G.222. (For description, see military T64.) Ivchenko AI-20 (USSR) Single-shaft turboprop. The first known turbine engine from the Ivchenko design bureau, and believed to be derived from the Kuznetsov NK-4 turboprop. Its main installations are as the 4,000 e.h.p. AI-20K in Antonov's An-lOA and An-12 and the Ilyushin I1-18V; as the 4,105 e.h.p. AI-20D in the Beriev Be-12; and as the 4,250 e.h.p. AI-20M in the Ilyushin I1-18D and -18E. AI-20M Ten-stage compressor, annular combustor, three-stage turbine. Forward-mounted integral gearbox. Take-off 4,250 e.h.p.; mass flow 45-61b/sec; pressure ratio 7-6:1; length 121-8in; diameter 17-7in; weight 2,2701b. Ivchenko AI-24 (USSR) Single-shaft turboprop. It powers the Antonov An-24, is flat-rated and operates at constant r.p.m. The most recent version is the 2,800 e.h.p. AI-24T powering the An-24V Series II, An-24BV and An-24TV. AI-24T Ten-stage compressor, annular combustor, three-stage turbine. Forward-mounted integral gearbox. Take-off 2,800 e.h.p. with water injection; mass flow 31-71b/sec; pressure ratio 7-05:1; length 95-9in; weight 1,3231b. Pratt & Whitney JFTD12 (USA) Free-turbine lurboshaft. The most powerful helicopter turbine operating in the West, the JFTD12 uses the' JT12 turbojet as a gas generator, it being coupled to a free power turbine. The engine's sole application is as the 4,500's.h.p. JFTD12 powering the Sikorsky S-64E. An improved version is the 4,800 s.h.p. JFTD12A-5A. (For description see military T73.) Rolls-Royce Dart (UK) Single-shaft turboprop. An outstand ingly successful turboprop now entering its 20th year of series production. Numerous applications include the
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