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Aviation History
1937
1937 - 1716.PDF
642 FLIGHT. JUNE 24, 1937. ENGINES at HATFIELD S.B.A.C. Show: Debut of Advanced High-Powered Models : Two-speed Blowers : Figures for the Latest Bristols : The New Napier : 1,700 h.p. From an Alvis IT is difficult to recall a more meritorious dis play of British aero engines than that to be seen at Hatfield next Monday and Tues day. At least two high-powered engines will be making their first public appearance, and in several instances figures for new types have only just been released by the Air Ministry. The units which go to make up this outstand ing display are treated hereafter under the names of their manufacturers. ALVIS.—The new Alvis two-row Alcides and Pelides Major engines will appear on Stand D, the former being an 18-cylinder model, while the latter is a 14-cylinder type. New and important features have lately been incorporated : more efficient cooling has been effected, the power-to- weight ratio is only a fraction above 1 lb. per h.p. and the small overall diameter and clean exterior design of the engines provide for simplified installation and more effective cowling. Both models are geared, but the Alcides on show will be moderately supercharged, whereas its companion is fully super charged. The leading characteristics of the Alcides are: bore, sjin. ; stroke, 7.087m.; diameter, 55-jin.; net weight, 1,670 lb.; max. Of advanced conception and beautifully finished, the 1,150 h.p. fourteen- cylinder sleeve-valve Hercules is the newest of the Bristol engines. take-ofl r.p.m., 2,250; take-off power, 1,700 h.p.; inter national rated power, 1,650 h.p. Those of the Pelides Major are: bore, 5|in.; stroke, 6£in.; diameter, 52m.; net weight, 1,190 lb.; max. take-off r.p.m., 2,400; take-off power, 1,000 h.p.; international rated power, 1,000 h.p. Makers: Alvis, Ltd., Holyhead Road, Coventry. ARMSTRONG SIDDELEY.—The piece de resistance of the Armstrong Siddeley exhibit on Stand L will be the fourteen-cylinder two-row Tiger VIII, fitted vrith two-speed supercharger and variable-pitch airscrew. This new engine, which powers the latest models of Armstrong Whitworth Whitley heavy bombers, delivers 920 h.p. at 2,375 r.p.m. for take-off and 782 h.p. at 14,500ft. The Tiger VIII should be studied in conjunction with the working model ol a two-speed supercharger. This is constructed on the epicyclic principal, the change of gear being effected by means of pressure oil passing through a two-way cock manually con trolled by the pilot. In addition to the Tiger VIII there will be the latest type of Cheetah which is known as the Series X. This seven-cylinder moderately super charged air-cooled radial is equipped for the opera tion of a variable-pitch airscrew and delivers 373 h.p. for take-off. At 7,100ft. and 2,300 r.p.m. the output is 340 h.p. and at 7,600ft. and 2,425 r.p.m. the figure is 351 h.p. Also on show will be the Cheetah VA normally aspirated radial rated at 285 h.p. at 2,100 r.p.m. At maximum speed (2,400 r.p.m.) the power is 326 h.p. Makers: Armstrong Siddeley Motors, Ltd.. Park- side, Coventry. BRISTOL.—The latest medium-supercharged Mercury, a Pegasus with two-speed blower, the newest Perseus, and the Hercules will all figure in the Bristol exhibit on Stand J. Known as the Mercury Series XI and XII, the new medium-supercharged Mercury engines have Rated at 745 h.p. at 6,500ft. the 24.9-litre Perseus is a type destined for extensive military and civil service.
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