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Aviation History
1939
1939 - 2035.PDF
Advertisements. JUNE 29, 1939. % INHERENT ADVANTAGES of the "BRISTOL" SLEEVE-VALVE DESIGN. I. Elimination of maintenance. An important and special advantage peculiar to the " Bristol " sleeve-valve design is that of the elimina tion of maintenance routine and top overhauls, with the exception of the servicing of plugs and magnetos. Several factors combine to make this possible, the principal one being the essential simplicity of design, with the entire absence of poppet valves and of the associated springs, valve seats and guides, tappets, push rods, rocker mechanism, etc., which absorb so much time and labour in maintenance. In addition, the valve mechanism is entirely enclosed within the engine and requires no running adjust ments. The sleeve-valves are positively operated, and the valve timing is positively determined so that it cannot vary once the engine is assembled, while the timing is very simple to set accurately during overhauls. The sleeves are designed to work with a smooth, sliding, positive motion in direct contrast to the hammer- and-anvil action of poppet valves. All these factors contribute to long life with minimum maintenance ; and in addition to the elimination of top overhauls, the period between major overhauls is at least equal to those already obtained with " Bristol " Pegasus and Mercury poppet-valve engines DESIGNED AND PRODUCED BY THE BRISTOL AEROPLANE CO. LTD., BRISTOL. *# Printed in England for the Proprietors and Publishers, FLIGHT PUBLISHING COMPANY, LIMITED. Dorset House, Stamford Street, London. S.E.I, by IWE CORNWALL PRESS LTD., 1-6, Paris Garden, Stamford Street, London, 8.E.I. "Flight" can be obtained abroad from the following: FRANCE: W. H. Bmita & Son, 248, Rue Rivoli, Paris; Hachette et Cie, Rue Rfaumur, Paris, and branches; Messagtries Dawson, 4, Rue de Faubourg Poissoniere. Paris. BELGIUM W. H. Smith & Son, 71-75, Boulevard Adolphe Max, Brussels. AUSTRALIA: Gordon k Gotch, Ltd., Melbourne (Victoria), Sydney (N.S.W.), Brisbane (Queensland), Adelaide (S.A.), Perth (W.A.), and Launceston (Tasmania). NEW ZEALAND : Gordon and Gotch, Ltd., Wellington. Auckland. Christcburch an•> Dunedin. INDIA: A. H. Wheeler 4; Co., Bombav, Allahabad and Calcutta. CANADA: Imperial News Co., Toronto, Winnipeg and Vancouver; Benjamin NOT" Co., Montreal; Gordon and Gotch, Ltd., Toronto. SOUTH AFRICA: Central NewB Agency, Ltd., Wm. Dawson & Sons (S.A.i, Ltd.,jpape Town. UNITED STATES r. i i ...I ..II ~1 XT ^1„
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