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Aviation History
1924
1924 - 0338.PDF
LIGHT 'PLANE ENGINES [In the following notes brief particulars are given of two small engines which have been proved suitable for light aeio- planes, and of one engine which is as yet experimental. One of these engines was originally designed for motor-cycle woik, but has been adapted for use in aircraft.—ED.] Two views of the Blackburne " Tomtit " engine, 696 c.c. capacity. THE BLACKBURNE ENGINES The engine which undoubtedly gave the most satisfactory performance at the light 'plane trials at Lympne in 1923 was the 696 c.c. Vee-twin designed and built by Burney and Blackburne, Ltd., of Bookham, Surrey. These engines were the original Blackburne motor-cycle engines, and were more or less crudelv adapted. Since then the engine has been somewhat modified, and as a light 'plane engine has been marketed under the name the " Tomtit." In its new form the engine looks as shown in the accompanying photographs. The engine capacitv is 696 ex., the bore and stroke being 71 mm. and 88 mm. respectively. The power developed at normal speed of 2,400 r.p.m. is 16 h.p. and the maximum permissible speed is 3,600 r.p.m., at which speed the " Tom tit " develops 24 h.p. The fuel consumption is 0-58 pint (0-33 litre) per horse-power per hour, and the oil consump tion 0-035 pint (0 02 litre) per horse-power per hour. The weight of the engine complete is 75 lbs. (34 kgs.). A new engine is now being developed by Burney and Black burne. This will be a 3-cylinder radial air-cooled, with a bore of 69-4 mm. and a stroke of 96-8 mm. The capacity will thus be 1,096 c.c. This engine has been designed to come within the limit of 1,100 c.c. fixed for the 1924 light 'plane two-seater competitions to be held at Lympne in September. The weight of the 3-cylinder engine is 98 lbs. (44-5 kgs.). The fuel consumption is 0-55 pint (0-313 Front and rear views of the new Bristol " Cherub " light 'plane engine. Above, view from underneath. 338
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