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Aviation History
1914
1914 - 1062.PDF
I/DOHT OCTOBE* «3, 1914. THE 120 H.P. GREEN ENGINE. MILITARY AEROPLANE ENGINE COMPETITION. THE WINNER OF THE NAVAL AND ELSEWHERE in this issue we comment upon the latest achievement of the Green Engine Co. in winning the ,£5,000 prize offered by the War Office in connection with the Naval and Military Aeroplane Engine Competi tion, the regulations governing which were published in FLIGHT for the 14th June, 1913. The success is all the HHflHBHBBIBBflflBHSI The 120 h.p. Green engine. more creditable when it is recalled that on two previous occasions Green engines have secured highest awards in open competitions. All these successful engines were designed on somewhat similar lines, but the 30-35 and the 60-70 h.p. engines, which won the Patrick Alexander Competitions of 1910 and 1911 respectively, are of the our readers are, therefore, familiar with their genera? construction. It may, however, be mentioned that the engine has a bore and stroke of 140 mm. and 152 mm. respectively, weighs 440 lbs. complete, and develops its rated horse-power at a speed of 1,250 revs, per min. The essential features of the design are: The copper jackets, with their special rubber joints at the bottom ends, to allow for the difference in the expansion of copper and steel; the overhead enclosed valve gear, which by rotating the casing about the cam-shaft permits of ready access to the valves for examination or grinding in ; the neat compact arrangement of the driving gear for the magneto, and the water and oil pumps; the employment of a fully forced system of lubrication to all bearings, and the provision of a bearing between each crank throw. Since this engine, which is an improvement on the old 100 h.p., was first placed upon the market, it has undergone no radical change in design, such alter ations which have been made having had as their object increased reliability and power and decreased vibration. To this end, the crankshaft has been stiffened up, the reciprocating parts have been lightened, and a special hot-air intake has been fitted, which draws air from around the uncorked portion of the cylinders, thus conducing to more effective lubrication and efficiency. The Green was the third lightest amongst the water-cooled engines in the Competition, only those entered by the Dudbridge Ironworks and by the Sunbeam Motor Car Co. having a higher power weight ratio. Economy in the consumption of fuel and oil has always been a marked quality of the Green engines, as the performances of the engines in previous engine competitions and in the Military Aeroplane Trials of 1912 testified, and is, no doubt, largely due to the very effective system of lubrica- ^=i| THE 120 H.P. GREEN ENGINE.-Sid; and end sectional elevations. four-cylinder vertical type, whilst the 120 h.p. engine is a six-cylinder vertical motor. Full detailed descriptions of the 120 h.p. Green engine have appeared in these pages from time to time,* and * See FLIGHT for March 14th and 21st and April 25th, 1914. 1062 tion and carburation employed ; a Zenith carburetter is fitted. The construction embodied in the valve gear, the method of supporting the crankshaft and the forced system of lubrication also conduce to a silent, smooth running engine, and together with light reciprocating parts
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