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Aviation History
1919
1919 - 0869.PDF
JULY 3, 1919 THE COSMOS AERO ENGINES THE peculiar conditions under which aeroplanes were working during the War—especially those used for fighting—have led to an extensive development of the radial air-cooled aero-engine, a type which previously was represented by only a few examples, and which was thought by many to be going out of fashion. The reasons for its restored popularity— and there can be no doubt that, at any rate towards the It might be argued that for commercial flying manoeuvra bility will not be of such vital importance as it was in the case of the fighting aeroplane, and that, therefore, overall length will not count to the same extent, while light weight per h.p. will be of less moment than reliability. Granting that this is so, and that in the list of qualities which the commercial aero_engine must possess, reliability should THE COSMOS 300 H.P. " MERCURY " ENGINE.—Front and rear view. latter part of the War, this type was the subject of very thorough research—are various, but chief among them is undoubtedly the fundamental advantage of the radial type as compared with others ; that of short overall length. This enables the aeroplane designer to mass his heavy weights close together, thus reducing the longitudinal moment of inertia of his machine to a minimum, which is a desirable feature in a fighting machine that has to be capable of very quick manoeuvres. Combined with this, experience has shown that a well-designed radial engine can be produced having a very high power-weight ratio. come first it should not be forgotten that, generally speaking, the machine whose engine is of light weight per horse-power, will have a greater paying cargo capacity than one fitted with a heavier engine. Therefore, other things being equal such as reliability and fuel consumption, the light engine will still score in commercial aviation. Among those who believe that the radial air-cooled aero engine offers great possibilities in weight reduction, even after reliability and low fuel consumption have been ensured, is the Cosmos Engineering Co., Ltd., of Fishponds, Bristol, whose post-War programme is based entirely on the pro- E E E E ESSE E E X The Cosmos 300 h.p. " Mer cury " engine in a *' Bristol ' ' scout. X E E E E E X X E H HSH HHE 869
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