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Aviation History
1932
1932 - 1191.PDF
FLIGHT, NOVEMBER 24, 1932 British Aero Engines I f'/'-E published, last week, in a special supplement, a survey of all the more important types of 1/1/ aircraft which the British aircraft industry has to offer, and this week we are following up that " " supplement with another one containing a representative selection of British aero engines of the types which are responsible for the excellent performance and reliability of British aircraft. In the space at our disposal it is obviously quite impossible to give more than a very cursory description of just a few of the most important engines produced by each firm, and the omission of any engine from our list must not be taken in a derogatory sense. Those listed here are not necessarily being exhibited at the Paris Aero Show, which is reported in another part of the paper. The A.B.C. " Scorpion " (34 h.p.)—left, and the A.B.C. " Hornet " (75 h.p.)—right. A.B.C. MOTORS, LTD. Walton-on-Thames A B.C. MOTORS, LTD., are manufacturers of two types of horizontallyopposed cylinder, air-cooled engines. The first of these, the " Scorpion," is a two-cylinder model giving 34 h.p. and the second a four-cylinder of 75 h.p., which is in effect.a tandem version of the smaller engine. The cylinders of the two types are interchangeable, with a bore and stroke of 102 mm. and 122 mm. The cylinder heads are of cast iron and are bolted direct to the steel cylinder barrels. Two valves are fitted to each cylinder head operated by push rods. The induction manifold is particularly neat and is cast integrally with the lower half of the crankcase, thus utilising the heat of the oil to warm the mixture, while at the same time cooling the oil. The crankshaft, of one piece, has a roller bearing at each end with a central plain bearing between the throws in the case of the four-cylinder engine. Single or dual ignition can be fitted as desired and a Zenith carburetter supplies the mixture. The auxiliary drives are taken by gearing through the rear end of the crankshaft and on' its front end the airscrew boss is fitted. Mounting in the aircraft is effected through the medium of four steel tubes fitted horizontally to the crankcase, forming engine bearings. ARMSTRONG SIDDELEY MOTORS, LTD. Coventry E NGINES which emanate from the Armstrong-Siddeley works at Coventry may well be classed as a family, inasmuch as these engines all have the same general characteristics and in many cases are built up from identical parts, the difference lying often only in the number of cylinders. At the Paris Show a -geared model of the 800-h.p. " Leopard," a geared and moderately supercharged 545-h.p. " Panther," a " Double Mon goose " of 340 h.p., a " Lynx " of 215 h.p., and the seven-cylinder " Genet Major " of 140 h.p. are shown. The complete series produced by this factory covers the power range of from 80 to 800 h.p., and most of the engines can be ob tained in geared and supercharged models. Common to each of these engines, in so far as the main characteristic features are con cerned, is the general design of The Armstrong-Siddeley geared " Lvnx " (215 h.p.). 1113 the crankcase, which is a single casting closed by front and rear covers, a one-piece crankshaft, a connecting rod assembly of the master-rod type, and cylinders of composite construction having aluminium alloy heads screwed and shrunk on to steel barrels. The five-cylinder engines are the "Genet" (80 h.p.), "Genet Major " (100 h.p.), and " Mon goose " (150 h.p.). Seven-cylinder engines include the seven-cylinder " Genet Major " (140 h.p.), tr*. " Lynx " (215 h.p.), and the " Cheetah " (260 h.p.); the last- named being previously known as the " Lynx Major." The ten- cylinder engine is the " Double Mongoose " (340 h.p.). The four- teen-cylinder range includes the " Jaguar " (400 and 460 h.p.), the " Panther " (535 h.p.), the " Tiger " (600 h.p.), and the " Leopard " (800 h.p.). The " Tiger " is a new engine and
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