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Aviation History
1962
1962 - 1708.PDF
338 Bristol Siddeley Pegasus FLIGHT International, 30 August 1962 jet-flap research machine and Balzac VTOL test bed. Many have been shipped abroad for such applications as the Japanese Tl-A trainer and early Lockheed JetStars, and the Orpheus is in production in Italy, Germany and India (it was the first jet engine built in Asia). Pegasus This was the pioneer vectored-thrust engine with rotating nozzles to give forward thrust, lift or reverse thrust for braking. From the outset its develop ment has been linked with that of the Hawker P. 1127, in which it first flew—in tethered hovering trials—in October I960. Since that time the output has been raised in successive versions from 11,5001b to 18,4001b, together with bleed air for aircraft stabilization; and further aug mentation is likely to result from the introduction of p.c.b. (described in con nection with the BS.100). Three-quarters of the cost of developing the Pegasus has been borne by the US Government, the remainder being paid for by Bristol Siddeley. Viper Latest member of this family of small turbojets is the Viper 20, or Mk 500 series, in which an additional stage of blades added at the front of the com pressor results in an increase in take-off thrust to 3,0001b coupled with improved fuel consumption. This engine is in pro duction for die D.H.I25 and Piaggio- Douglas executive aircraft, and less powerful Vipers are in production in Britain and Italy for military trainers and target drones. Rolls-Royce Ltd 50% '% 1 D. Napier & Son Ltd Wholly owned by English Electric 50% I NAPIER AERO ENGINES LTD PO Box 24, Acton, London W3. Shepherds Bush 1220. I 4,000 approximately Napier Gazelle 162 (installed in Wessex 31 at this-jangle) Acton: development and production of Gazelle; aero-engine research and project design; service support for Eland. Park Royal, W3: Napiercast investment foundry. Park Royal, NWI0: engine test beds. Liverpool, Lancashire: aerodynamic and gas-dynamics research. Gazelle From June 1954 the Gazelle has been under development specifically for the propulsion of helicopters, and it has a free-turbine output and can he installed at any angle. In the Wessex I and 3 it is positioned at about 35*, in the Belvedere a pair of Gazelles are mounted almost vertically at opposite ends of the fuselage, and in future heli copters the probable installation would be horizontal. Present Gazelles in opera tional service with the RAF and Royal Navy are rated at approximately 1,450 s.h.p. (what is known as an " intermediate contingency " rating), but the Gazelle 162 now in production for the Royal Austra lian Navy gives 1,540 s.h.p. and future marks of engine cover a number of levels of power up to nearly 3,000 s.h.p. Development is being assisted by Rolls- Royce.
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