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Aviation History
1944
1944 - 1252.PDF
Advertisements. FLIGHT JUNE 22ND, 1944 AIR FILTRATION for AIRCRAFT ". . . problems have been overcome by two types of filter which we have been producing in great numbers — the Vokes Aerovee and the Vokes Three-ply. The Aerovee is a dry type filter ... It is made in five layers ; two of wire gauze between which there are two layers of fabric with a centre layer of special filtering material. These layers are stitched together and are then corrugated into deep folds, so that in relation to the air inlet an enormous filtering surface is created ... It is part of the standard equipment of the Hurricane, Spitfire and Defiant fighters, and of the Wellington I.e., the Manchester and Halifax I bombers (to name but a few types of aircraft) . . . capacity in c.f.m. ranges between 560 and 3185 . . . The Vokes Three-ply is a viscous type filter. It comprises two layers of wire-mesh gauze between which is a layer of fabric acting as an oil-retaining agent . . . The Three-ply is fitted (chiefly) to air-cooled engines and is standardised on the Beaufighter, the Beau fort, Blenheim, the Stirling, Albermarle and Halifax II. It is also used on the American Boston, Maryland and Lockheed Hudson HI, fir IV and VI. (In all, about fifty types of aircraft are fitted with one or other of these filters). Really remarkable results have been achieved . . . types of engine that were worn out after twenty to fifty hours and often less were still worth reconditioning after two hundred hours flying . . ." From an article in " Flight " (February 24th, 1944) by C. G. VOKES, A.M./.Mech.E., A.F.R.Ae.S., M.S.A.E.,M.I.A.E., Managing Director, VOKES LTD., LONDON. S.W. C VOKES AIR FILTERS ARE ALSO FITTED TO MANY AERO ENGINE TEST BEDS
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