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Since the Armistice the gradual development of the various types of aero engines, together with the abandonment of windmill driven accessories, has necessitated an increase in the number of auxiliaries incorporated in the engine structure, and the engine designers are to be complimented for the ingenuity and compact arrangement of the auxiliary drives and housings on present-day aero engines.
The auxiliary drives for valve operation, dual magnetos, oil pressure and scavenge pumps, water and petrol pumps, supercharger, turning, starting and gun gears, are usually grouped in a housing or housings at the rear of the engine, except that on the radial air-cooled engine the valve gear is arranged at the front and the water pump is unnecessary.
Note on page No 850 1 “Aero Engine Problems in Flight, with Particular Reference to Carburation,” November 15th, 1928, R. J. Penn.
Note on page No 850 2 “The Lubrication of Aircraft Engines,” May 23rd, 1929, F. A. Foord.
Note on page No 850 3 “Recent Development in Engine Cooling,” March, 1931, A. Swan, R.Ae.S. Journal.