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Aviation History
1936
1936 - 1359.PDF
558 FLIGHT. MAY 21, 1936. 1.1 ........ The Short Empire boats will be fitted with Bristol Pegasus XC engines. The XC is the commercial version of the 840/975 h.p. Pegasus X which will power a number of new military types. the Tiger IX and Panther X, to use 87-octane fuel. It is sup plied only in direct-drive form. The cylinders are very similar in construction to those of the Tiger, but are of rather smaller bore. They may be regarded, in fact, as the cylinders of the Panther X. The smallest engine now in production at the Siddeley works is the seven-cylinder Genet Major rated at 150 h.p. This model looks like a scaled-down version of the ever-popular Lynx, which, in its most widely used form, when it is known as the Mk. IVC, delivers a normal output of 215 h.p. (Makers: Armstrong Siddeley Motors, Ltd., Parkside, Coven try.) BRISTOL The astoundingly high powers which are being taken from the current models of the Bristol Mercury and Pegasus nine- cylinder radials belie the statements that, where high outputs are concerned, the nine-cylinder engine is becoming obsolete. In the latest type Pegasus we have an engine delivering about 1,000 h.p. with eminent satisfaction; just how many more " horses" can be produced from the long-familiar nine Bristol "pots" remains to be seen. The very latest types to be offered commercially are the Mercury Series VII, VIII, and IX and the Pegasus X, XI and XII. The new-type Mercury (the engines mentioned differ only in reduction gear ratio) gives an increase of nearly 30 per cent, in output compared with the Mercury VI, which it super sedes. It is relatively lighter in spite of increased power, and incorporates a number of up-to-date features such as provision for the De Havilland V.P. airscrew and long-chord controll able cowling combined with exhaust ring. These latter features, incidentally, are also standard on the latest Pegasus engines. The normal rated output of the new Mercury is 720 h.p. at 2,400 r.p.m., at 12,500 ft., and the maximum power available for level flight is 840 at 14,000 ft. The bare weight is only 980 lb. For their fleet of new Empire flying boats, Imperial Airways are specifying Pegasus XC engines. The XC is a commercial version of the Pegasus X (the XI and XII are similar to the latter model except for reduction gear ratio), but operates, like its military brothers, on fuel of 87 octane number. The new type of Pegasus is rated at 840 h.p. at '2,250 r.p.m., at 3,500ft., and gives no less than 975 h.p. for take-off when fitted with a V.P. airscrew. Of the Bristol sleeve valve engines which are awaited with such interest the two commercial types are the 500 h.p. Aquila and the 663/770 Perseus II. (Makers: The Bristol Aeroplane Company, Ltd., Filton, Bristol.) BRITISH SALMSON Three basic models comprise the current British Salmson range, these being the soh.p. A.D.9, and A.D.9R Series III (which is normally rated at 80 h.p. at 3,000 r.p.m., and gives 86 h.p. at 3,300), and the 150 h.p. A.C.g. In their main fea- The Bristol civil-rated Aquila runs on fuel Df 73 octane number and gives 500 h.p. This is claimed to be the first air-cooled sleeve valve engine to go into series production. tures these three engines are similar in construction but differ in size. Their weights are i6o!b., 1851b., and 3741b. respec tively. All are nine-cylinder radials, making for easy cooling and uniformity of torque. (Makers: British Salmson Aero Engines, Ltd., Raynes Park, London, S.W.20.)- CIRRUS-HERMES It is an interesting fact that two 82/90 h.p. Cirrus Minor engines consume no more petrol than one engine of the 125/135 h.p. Major type although they give a total output of 33J more power Both these engines are four-cylinder-inverted- in-line types and weigh 195 lb. and 310 lb. respectively. A batch of fifty Minor engines is now going through the shops and will be installed in light private-owner and com mercial types. A small twin-engined cabin monoplane with a pair of Minors suggests itself as a good, economical proposition Makers: Cirrus-Hermes Engineering Co., Ltd., Broitgh, Yorks.) DE HAVILLAND A very large percentage of the commercial machines being operated by British companies are fitted with De Havilland Gipsy engine? of the Six or Major types. The Six is the more The 125/135 h.p. Cirrus Major is of the popular inverted four-cylinder-in-line type. Its small brother, the Minor, is of 90 h.p.
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