The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . sby means of automatic inlet valves placed in the head^ of the exhaust valves are arranged on the cylinder heads. Dualignition is provided by high tension magneto and storage battery andcoil. The cylinders are ribbed outside like the Anzani, and arevery effectively air-cooled by their rotation through the air aswell as by the passage of the aeroplane through the cylinders in the 35 motor are no mm. bore X 120 The speed of rotation is usually 1200 revoluti
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . sby means of automatic inlet valves placed in the head^ of the exhaust valves are arranged on the cylinder heads. Dualignition is provided by high tension magneto and storage battery andcoil. The cylinders are ribbed outside like the Anzani, and arevery effectively air-cooled by their rotation through the air aswell as by the passage of the aeroplane through the cylinders in the 35 motor are no mm. bore X 120 The speed of rotation is usually 1200 revolutions per total weight of the engine complete is 180 lb, or just over 5 lbper brake horse-power. The subject of aeroplane petrol engines is amost interesting one, and rapid progress is being made. So far, only 4-cycle engines have been described, and they arealmost universal for use in motor-cars and aeroplanes. Somemotor cars, however, use 2-cycle engines. Several types followthe Clerk cycle (see Gas Engine) and others the Daycycle. In America the Day cycle is very popular for motor. Fig. 8. launches, as the engine is of a very simple, easily managed present, however, the two-cycle engine has made but littleway in motor car or aeroplane work. It is capable of greatdevelopment and the attention given to it is increasing. So far, petrol has been alluded to as the main liquid fuel forthese motors. Other hydrocarbons have also been used; benzol,for example, obtained from gas tar is used to some extent, andalcohol has been applied to a considerable extent both forstationary and locomotive engines. Alcohol, however, has notbeen entirely successful. The amount of heat obtained for agiven monetary expenditure is only about half that obtainedby means of petrol. On the continent of Europe, however,alcohol motors have been considerably used for public vehicles. The majority of petrol motors are provided with water jacketsaround their cylinders and combustion spaces. As
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