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Aviation History
1919
1919 - 0233.PDF
FURUAHY 20, I9I9 200 HP. HIGH COMPRESSION MERCEDES [Issued by the Technical Department Aircraft Production) Ministry of Munitions,'] THE following report on the running performance of the standard 180 h.p. Mercedes engine already ENGINE of the 200 h.p. nigh compression Mercedes engine is based on an examination and tests carried out at R.A.E. on the engine (No. 775) taken from a Fokker D. 7 biplane (G/2 B/14) standard 180 h.p. Mercedes engine already reported on, except as to the following points :—(1) New design of pistons giving increased compression. (2) Carburettor—fitted with altitude control. (3) Induction manifolds—water jacketed. Fig. 1. -Induction side of engine brought down in France on June 6, 1918. It is ol interest to note tkat this is the first Mercedes engine to be fitted with am altitude compensator carburettor. This com pensator which is here fully described, is so arranged thai it is impossible to run the engine all out on the ground. In most respects this engine is identical in design with the (4) Duplex horizontally opposed air pumps. (5) Wireless dynamo mounted on induction side of crankcase, driven by gearing from rear end of crankshaft. Piston Design and Compression Ratio The pistons used in these engines are of the usual Mercedes construction, being built up with steel crowns which carry Fig. 2 —Details of piston 233
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