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Aviation History
1918
1918 - 1256.PDF
Fig. 15.—Section of propeller hub. the previous Austro-Daimler and Beardmore engines. Inother respects the construction of the propeller hub is of ordinary design, but compared with those used on mostother enemy engines the weight of the propeller hub is con- siderably below the average, viz., 11.3 lbs.—less the crank-shaft extension. Details of the propeller hub are given for reference in Fig. 15. Crankcase [Top Half) The construction of the cast aluminium crankcase is pro-portionally heavy, both in design of the top and bottom halves. The top half weighs—with main journal bearingscomplete and cylinder holding down bolts and studs—133.4 ^ys- and the bottom half, which forms the oil base and sump,weighs no less than 73.5 lbs. dry. This makes a total weight of 207 lbs., approximately, for the complete crank-chamber,which works out at 28 per cent, of the total weight of the engine. The transverse webs which form the crankshaft journalbearing housings, are of the usual box section, and the eight engine bearer arms cast on the crank-chamber, four on eitherside, are made as continuations of the transverse webs, and are of the same section ; they are exceptionally deep, asshown in the cross sectional view of the engine, Fig. 3. The front portion of the top half of the crankcase is con-structed to form the feed oil tank. This tank, as shown in the section on the general arrangement drawing of theengine, encloses the bottom portion of the camshaft vertical Fig. 16.—Inside view of base chamber and filter plates. Fig. 17.—View of base-chamber from beneath, showing air passage and cover plate. '::-jr:~~':*-C~'^'^~'r 1257 "
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