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Aviation History
1918
1918 - 0562.PDF
MAY 33, 1918. THE 240 H.P. (8-CYLINDER) MERCEDES. (BORE 140 MM. The following detailed report on the design of the 8-cylinder Mercedes engine is based on an investiga- tion of the engine (No. 23,003) taken from the German two-seater Albatross Biplane (G.37) which was brought down by anti-aircraft guns near Armentieres on May 12th, 1917. This engine has been tested at the Royal Aircraft Factory and results of B.H.P. developed, petrol and oil consumption, &c, during tests are given herewith, together with details of the engine design and the leading particulars of the engine. Although this engine, according to reports, is now obsolete, the design having been abandoned in favour of the German standard six-cylinder vertical type, details and illustrations of the engine will no doubt prove of considerable interest, more particu- larly to those interested in the design of the special engines used for airship work. In its general details this engine follows closely the design of the 160 H.P. Mercedes engines as regards the construction of the cylinders, pistons, valve gear, &c, and also in the lubrication system. It is STROKE 160 MM.) therefore very similar to the 160 h.p. engine, with an extra pair of standard cylinders and a massive propeller shaft reduction gear, and the necessary alterations to the design of the crankshaft and the induction system, and in consequence of this similarity in detail to the 160 h.p. Mercedes, it will be un- necessary to deal at any length in this report with the design of those parts of the engine which are identical, a report on the former having already been issued, and the design being now well known in this country. Engine Data. Number and arrangement of cylinders, eight, vertical separate ; bore, 5-51 ins. =140 mms. ; stroke 6-30 ins. = 160 mms. ; stroke/bore ratio, 1 • 142 : 1 ; area of one pistcn 23-84 sq. ins. = 1539 sq. cms. ; total piston area of engine, i9°"83sq.ins. = i23isq.cms. ; stroke volume of one cylinder, 150-28 cu. ins. =• 2463 cu. cms. ; Total stroke volume of engine, 1202 ^cu.ins. = ig7O4cu.cms. ; volume of clearance space, 40-30 cu. ins. = 660 cu. cms. ; compression ratio. Total volume/Clearance volume, 4 • 73 : 1. Max. B.H.P. and speed, 287 B.H.P. at 1750 r.p.m. ; Normal B.H.P. and speed, 242 B.H.P. at 1350 r.p.m. ; Piston speed Fig. 4.—One of the standard type 160 h.p. cylinders,complete with valves, and showing the inlet and outlet water connections welded on to the sheet steel water jackets. 560 Fig. 5.—Sectional view of cylinder, piston, gudgeonpin, connecting rod and valves, showing water jacket spaces and method of cooling the exhaust valvestems. Note the sectional view of the connecting rod is shown at right angles to its correct position in thecylinder. i
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