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Aviation History
1918
1918 - 1218.PDF
OCTOBER 31, 1918 THE 2OO H.P. AUSTRO-DAIMLER AERO ENGINE [Issued by Technical Department, Aircraft Production, Ministry of Munitions.'] Number of cylinders : six, vertical; Bore : 135 mm. ;Stroke : 175 mm. ; Normal b.m.e.p. : 123.3 lbs. per sq. in. ; Average b.h.p. : 200 at 1,400 r.p.m. ; Compression ratio :5.02 : 1 ; Petrol consumption per hour : 111.0 pints ; Petrol consumption per b.h.p. hour : 0.555 pint .' Oil consumption,per hour : 7 pints ; Oil consumption per b.h.p. hour : 0.035 pint ; Total weight of engine, dry : 728.5 lbs. ; Weight perb.h.p. (normal) : 3.64 lbs. The compression ration is considerably higher than thatof any of the enemy engines except the Maybach, and from the complete data published at the end of this report it willbe seen that the general efficiency of the engine is good, the h.p. per cu. ft. of stroke volume being ^77-3 and theh.p. per sq. ft. of piston area being 216.6. During calibration and endurance tests carried out at R.A.E.the running of the engine was very good, being very steady between 700 and 1,700 r.p.m. The engine was remarkablyclean, having no trace of oil or water leakages during tests. Compared with the usual high weight standard of enemyengine design, the weight per b.h.p. of 3.64 is quite normal. From our own standard of weights, however, the weight perb.h.p. is disproportionately high. This is chiefly due to the heavy construction of the crank-chamber and oil base, ratherthan to the design of the cylinders and reciprocating parts, which are well designed and are of light construction comparedwith other enemy engines. Introductory Note THE following detailed report on the design, construction, and general performance of the latest type of Austro-Daimler engine is based on an examination and tests carried out at R.A.E. on the engine (No. 19,218) taken from a captured Austrian " Berg " Scout. (R.A.F. No. A.G.6.) This machine, a single-seater biplane brought down on the Italian front in April, 1918, was captured in very good condition ; the engine had apparently only been in use for a few hours. With the exception of its high stroke, bore ratio and the construction of a detachable inlet valve seating in each cylinder, the design of this engine shows no great resemblance to the earlier types of Austro.-Daimler engines ; generally speaking, the new 200 h.p. Austro-Daimler possesses more than the usual amount of originality in design found in enemy aero engines. The general construction of the 200 h.p. Austro-Daimler is shown in the two photographs of the complete engine, Fig. 3.—Cross-sectional arrangement. Figs. 1 and 2, and also in the accompanying cross sectional and general arrangement drawings. Following the usual German practice, the engine is of the six-cylinder, vertical, water-cooled type with separate built-up steel cylinders. The principal characteristics of the design and its general performance are given in the following leading particulars of the engine :— Fig. 4.—Sectional view of cylinder. General Description As a preliminary survey of the general design of the 200 h.p.Austro-Daimler engine, the principal features of the engine are briefly described in the following summary :— The six separate cylinders are of the usual built-up steelconstruction with pressed steel water jackets, and are fitted with twin inlet and exhaust valves in the cylinder heads, 1219 ,^;r. I ,..-J;k
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