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Aviation History
1919
1919 - 1048.PDF
four or six cylinders each. Further extension of this principle . has enabled Messrs. Napier to produce a 12-cylinder engine AUGUST 7, 1910 shaft and crankcase is, of course, reduced to a minimum, and there have been engines with /three, five, six, seven, nine, ten, and fourteen cylinders in one or two planes. Of this type the Cosmos Co. have produced a 450 h.p. 9-cylindei air-cooled radial engine which weighs only 1-47 lbs. per horse- U »T'.jfc;gg^&i£_:jJ' b J^ ' - i * aa ; * W^^L' * !g | • fl I ...J Fig. 45.—140 R.A.F. 4a. Fig. 46.—160 Beardmore. Fig. 47.—Hispano-Suiza. Fig. 48.—Napier Lion. of 450 h.p. with three rows of four cylinders (three connecting- ' rods to each crank-pin) and weighing only i-86 lbs. per horse-power dry weight. In addition to placing cylinders in line, designers have from the earliest days of aero engines been attracted by the scheme for mounting all the cylinders radially around a common crank. By this arrangement the length of crank- Fig. 49—350 Rolls-Royce Eagle VIII. 1050 Fig. 50.--550 Galloway Atlantic.
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