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Aviation History
1913
1913 - 0047.PDF
JANUARY II, 1913. t/ycBfj AERONAUTICAL ENGINES. Paper read by A. GRAHAM CLARK before the Institution of Automobile Engineers. (Continued • roi/i page 21.) The Austro-Daimler Engine of 120-h.p. is shown in Figs. 5 .and 6, from which it will be seen that it somewhat resembles the •conventional car engine, as do also the 45, 65 and 90-h.p. engines. A single rod operates a rocking lever placed over each cylinder for actuating the valves, and i s therefore subjected alter nately to ten sion and com pression. To the engine il lustrated, two magnetos and two carburet tors are fitted, so that in the event of the failure of one of the former, the other will keep the engine in action ; while when two car burettors are employed, the probability of both becoming defective is not so great, and hence a safe descent can be made under .power. From the shape of the combus tion chamber, the author would not anticipate that any increase o f power i s likely to be obtained from having t w o sparks in the one cylinder. The fitting of .helical springs .to the valves would pro bably be pre ferable to the laminated springs which are now em ployed, on account of the lag due to the friction between the leaves, especi ally since the force required to operate the valve gear of this type must be great. Chenu En gines. — The 70-h.p. engine i s illustrated in Fig. 7, and is supplied with or without the reducing gear shown in the figure. . * It will be] observed that the suspension is trom the bottom half of the crank-case. The compression pressure used in these engines is not known, but it is presumably high, having regard to the brake mean effective pressure and thermal efficiency obtained C H a w « Q 6 c M 3 < a, A 6 a T CD 00 c a "5 a w a <« a 1. o Q d 43 6 CO 7 CO bo £ I I <a 9 < a. -s 6 CM 10 bo £ - m K'.J u _a '5 a w s a it 43 u a O f- I. r^ ho £ during tests carried out in the laboratories of the Automobile Club of France and the Conservatoire des Arts et Metiers, while the oil consumption is very low. 47
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