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Aviation History
1962
1962 - 1017.PDF
FLIGHT International, 28 June 1962 1015 Bristol Siddeley Viper 500 (BSV.20) on bench test AERO ENGINES 1962 . . . P.1127 transonic strike aircraft. Initially both were private ventures, but at an early date the engine received support under the Mutual Weapons Development Programme, the breakdown of financing being: MWDP (in this case, all US money), 75 per cent; BS and MoA, 25 per cent. Bench testing began in September 1959, P.1127 hovering started in October 1960, and over 200 transitions to and from horizontal flight have been made since September 1961. Initial flight engines were rated at 11,5001b, but, according to Les Ailes, the current engine is the 13,5001b BSPg.3, while the BSPg.5, now on the bench, is to take over at the end of the year. BS have said the first production version will be rated at 18,4001b, and this is probably the BSPg.5—which, according to the French journal, has a substantially hotter turbine, with cooled blades. Since the fan air is relatively cool, plenum-chamber burning can provide 30 per cent boost at take-off and almost treble the thrust at M2, with only a modest increase in s.f.c. Another development is thrust restoration at up to 1,350ft at 403C or 1,800ft at ISA by means of a pilot-selected water-injection system which can come into operation at a given nozzle angle. Pegasus engines are specified for numerous aircraft projects, and several V/STOL transports are based upon two or four Pegasus each discharging to one side through only two (larger) nozzles. Slave Bristol 188 intake on Gyron Junior DGJ./0 Bristol Siddeley (D.H.) Gnome H.I200 in production Proteus Some 2,500,000hr have been recorded in scheduled service in Britannias, and the TBO has risen to 2,800hr (trial to 3,000hr) with the Proteus 705 and 2,400hr with the more powerful 765. These free- turbine engines have Jessop's cast G.64 solid turbine blades, and cruise at a turbine temperature as high as any engine in the wofld. Marine and industrial versions, the latter cleared to burn diesel fuel or natural gas, are also in very successful service. Viper Most important current version of this single-shaft turbojet is the Viper 11, type tested and in production as the 200-series for Jet Provost T.4 trainers and Jindivik 3 target drones, and as the Mk 22 for the Macchi MB.326 trainer. Piaggio (q.v.) are making the Mk 22 under licence. First run in January, the Viper 20 (500-series) has a zero-stage and is being developed as the powerplant of the D.H.125 and Piaggio- Douglas 808. BLACKBURN What used to be Blackburn Engines Ltd, of Brough, Yorkshire, has now been integrated within Bristol Siddeley, and will cease to exist separately in two days' time. Engineering effort has been transferred to Patchway and manufacture to Coventry. Apart from the engine described below, BS have taken over the range of auxiliary power units developed by Blackburn from Turbomeca designs. Most important of these are the Artouste, installed in Trident, CL-44 and Victor B.2 aircraft, and the Palouste air compressor used in the CL-66 and in mass- produced 1-p starter trollies and pods. The Cumulus is being developed as a smaller and more powerful replacement for the Palouste. Immedi ately before their capital was purchased by BS, Blackburn had indicated their interest in manufacturing both turboshaft and turboprop versions of the Astazou under Turbomeca licence. BS are considering obtaining • rights for this engine and possibly also for the Aubisque (q.v.). Nimbus Blackburn developed this free-turbine turboshaft to give more than double the power of their earlier Turbomeca-derived units, with better s.f.c. The Nimbus 750 series are in production (at Brough, transferring to Coventry) for the Scout and Wasp helicopters, and BS have lately been ironing out various problems encountered as a result of its helicopter operational environment. Four Nimbus power the Westland SR.N2 Hovercraft. THE DE HAVILLAND ENGINE CO LTD, Leavesden, Herts. This company became part of Bristol Siddeley Engines last November, and will lose its separate identity next month. Spares are being produced to support many thousands of piston engines and Goblin and Ghost turbojets, as well as Super Sprite, Spectre and Double Spectre rocket engines. The company is developing pre-packaged liquid rocket motors under a technical agreement with Thiokol, and is in production with a peroxide-powered missile a.p.u. Gnome Four years ago a licence was obtained to manufacture the General Electric T58 turboshaft, and the Gnome is an anglicized and developed version. Although a turboprop is under consideration, current production applications are all for helicopters. The Gnome H.1000 passed a military type test in May 1961, and deliveries are steadily increasing beyond the recent level of 15 per month. Gnome- Whirlwinds are in service with RAF Coastal, Flying Training and Transport Commands, and the Ghana Air Force, and Agusta-Bell 204Bs are entering service with numerous military and commercial
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