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Aviation History
1913
1913 - 0101.PDF
JANUARY 25, 1913. AERONAUTICAL ENGINES. Paper read by A. GRAHAM CLARK before the Institution of Automobile Engineers lAum (Continued «w 60;h-P- ?al1 Scott Motor is seen in Figs. 14 and 15, but Tn?11 7,1*° ^herx.e?FTS ratedat 4° and 80-h.p. respectively. In all of them detachable heads are fitted to the cylinders, and .these are held in position by five long bolts passed through from the interior of the crank-case, as shown, the joint being made by a copper asbestos gasket. A separate pipe is fatted to connect up the jacket round the cylinder barrel with the water- cooled heads. It would seem that a more satisfactory con struction could have been devised than one which entails draining the jackets, the dis mantling of the whole of the valve gear and the breaking of the joint in the head in order to gain access to the valves. Cool ing of the oil is effected by passing it round the carburettor, as in the Maximotor en gines. All parts not made of aluminium are nickel plated for the purpose of obtain ing a clean finished appearance and for protection against at mospheric in fluences. It is claimed that these engines are very flexi ble, and that aviators in the United States use more of this make than of any other. This firm also produces special lightweight radiators, weighing only 12, 21 and 36 lbs. for engines of 40, 60 and 80-h.p. respectively. Kirkham Engines.—One of the features of these engines is the concentric inlet and exhaust valves shown in Fig. 13, from which the method of operation will be apparent. Such a construction from page 75.) engines, however, it has teen employed for over three years, and its continued use is evidence thai no serious trouble is experienced. 4mmS^ X 4 I v# ^\\;'| t h~*£<*« rMJL *vk^EUL W ° c Jmm \5a^^, Kjnk;• J*QI r 1 Fig. 13.—Section of Kirkham Engine. Fig. 14.—60-h.p. Hall Scott Engine Oil-cooling is provided for by the fitting of two finned copper tubes through the oil reservoir in the bottom of the crank-case. There is another model manufactured by this company in addi- ElHAUST VALVE LEVER Fig. 15.—60-h.p. Hall Scott Engine. allows of some small reduction in weight and enables a rather higher volumetric efficiency to be attained, while the passage of the fresh mixture into the cylinder tends to cool the exhaust valve. The system has been tried on various continental motors, but has generally been abandoned on account of overheating. In these Fig 16.—Valves of Gyro Motor. tion to those enumerated in the table, namely, a six-cylinder water- cooled vertical engine 4-ft in. by 5J in. giving 76-3 b.h.p. at 1,680 revolutions per minute, and weighing 285 lb. This is fitted with a 4 to 7 ball bearing reducing gear, so that the propeller speed is 960 revs, per minute. (To be continued.) 101
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