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Aviation History
1929
1929 - 0125.PDF
JANUARY 17, 1929 THE " HEENAN-FELL " PATENT VARIABLE AIR BRAKE DYNAMOMETER (As used by the British Air Ministry, etc.) Specially designed for rapidly ascertaining the exact B.H.P. of Aero Engines UNDER CON- DITIONS THAT WOULD BE MET WITH IN ACTUAL FLIGHT. This apparatus supplies an air blast ofsufficient volume and velocity to ventilate air-cooled engines without requiring theexpenditure of any external source of power, and can be installed at a fractionof the cost of electrically driven fans and their accessories. Simultaneously it measures the power developed by the engine undergoingtest with the same degree of accuracy as offered by the " Froude" system. If professionally interested, send for free copy of illustrated Catalogue No. 80. Heenan & Froude Ltd Worcester England mum iitimr IIHIIII iiiiiiiit miiiiii iiimiii WHIM IHIIJIII IIIHIII IIIIIIII inimii IIIHMI IIIIIIM ECONOMICAL CRUISING WITH THE AVT lOO TYPE CARBURETTER RIGHT: Graph showing Power, B.M.E.P. and Consumption Curves of the Armstrong- Siddeley 700-750 h.p."Leopard" Aero Engine. Torque, in mch- lbs., at any point equals 236 X B.M.E.P. Maximum torque (at 1,300 r.p.m) 30,584 inch-lbs. Note how the Claudel-Hobson Power Jet Carburetter fitted gives maximum power with economical cruising. LEFT: Illustrationshowing the type AVT 100 Claudel-Hobson Carburetter compared wiin one ofthe same make as fitted to many cars. M. HOBSON LTD., 47-55, The Vale, Acton, London, W.3. Telephone: Chiswick423\ (4 lines). TtLgranv "Assemblage. London." IIIIIIII 11111111 IIIIIIII Illllllll IIIIIIII IIIIIIII •IIIIIIII IIIIIIII IIIIIIII Illlllil Illlllll Save time by using the Air Mail. xix A.J.W.
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