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Aviation History
1932
1932 - 0028.PDF
FLIGHT, JANUARY 8, 1932 Armstrong Whitworth and Siddeley Development during 1931 The group of firms under the control of the Siddeley Development Company, i.e., Arm strong Siddeley Motors, Arm strong Whitworth Aircraft, and A. V. Roe &• Co., have had a busy year, and it is thought that a brief outline of the work of the firms during 1931 may be of in terest. The head of all these con cerns is, of course, Mr. J. D. Sidde ley, who pioneered motor car de velopment long before he turned his attention to aircraft and aero engines, and who has thus lived to see and take part in the birth and growth of two great industries. ARMSTRONG SIDDELEY AERO ENGINES str LOT of detail development C" \|| work has been put into \Zs ill the big range of Arm strong Siddeley aero engines during the past year. All, with the exception of the smallest, are now fitted with streamlined cylinders, quickly-detachable rocker covers, and enclosed push rods. These improvements have not only enhanced the appearance of the engines, but make them much cleaner in service. The results of other detail improvements are reflected in the increasing length of service that the engines give with out overhaul. Thus, large numbers of machines equipped with " Jaguar Majors " have recently completed 200 hours each without any engine trouble or overhaul, and are still running well. An Avro Ten fitted with three " Lynx " engines has done 600 hours without a top over haul, and the same machine during the first 129,000 engine-miles only cost for replacements £2 7s. 2d., which equals 0.004 of a penny per mile. The " Jaguar " engines in service on Imperial Airways' North African route, which are now all of the geared type, have covered over 2,043,645 miles. The " Jaguar Major " or " Panther " engine has been produced in considerable numbers, and is fitted in the following types of aircraft:-—Fairy " Gordon," Hawker " Hoopoe," Junkers W.33 seaplane, Vickers " Vildebeest," A. W. Aircraft. Supermarine " Southampton 10 " (3), Handley Page " Hare," Rairey IIIF, Supermarine " Air no 900 M0 860 M0 1 ! *: 111 Iff M0 tt *? ™ WO HO HO 560 wo STAN ROWER CURVE. P:.» IFV CviT m ;T< i I FP Fi J WK ftP EA / ;VAIAB-F fftO* J 15 60 FEET. ¥IM -r LEY _/ T CTC co / / GIVt !K1 / / 5», / / / •z. a. I 9 / .• / •T c. c: i . I J1 IJOO 1500 1400 600 1600 ITOO WOO HOO ENGINE RPM 7M 123 8» 949 «n I0» NW 17Q1 PROPELLOR RPM OARD AIR MINISTRY APPROVED TEST CONDITIONS STANDARD APPROVED FUEL DTD. 134 NORMAL RPM 1700 ENCINE:I076 PROP MAXIMUMRPM 1870 ENGINE:II83 PROP -S '""SssrQfcP POWER CURVE OF " LEOPARD III A: This geared engine is rated at 800 b.h.p. at 1,500 ft. and 1,700 r.p.m. i THE " JAGUAR MAJOR " : A 14-cylinder engine rated at 535 b.h.p. THE LATEST TYPE OF ROCKER COVER: Note the roller-ended tip and the grease gun nipples for the roller bearings on the tip and pivot. Yacht " (3), Hawker " Hart," Westland " Wapiti," Norwe gian " Ripon," Fokker C.5, Fokker D.XVl, and Swedish Jakdfalk. A point about the " Jaguar Major " engine is that it has definitely met the present-day demand for increased performance, with the lightest pos sible form without sacrificing reliability or durability. In this connection the new A.W.XVI single-seater fighter with " Jaguar Major " has attained a speed of over 200 m.p.h. at its operational altitude of 15,000 ft. The per formance of the " Atlas " reconnaissance machine has been improved by 20 m.p.h. by fitting the " Jaguar Major " in place of the " Jaguar," while the " Avro " mail carrier, when fitted with the same engine, attained a speed of 170 m.p.h., carrying 800 lb. of mail, with fuel for 600 miles. More recently the " Leopard," which is claimed to be the largest air-cooled radial engine in production in the world, has been successfully fitted with a new type of cylinder head. It employs two valves and valve gear similar to that used on the latest " Jaguar Majors." The design has been so successful that the weight of the engine with collector ring has been reduced by nearly 150 lb., while the power has been considerably increased. Points of interest in the valve gear are the enclosing of the push rods and rockers, the latter having easily detach able streamline covers and roller-ended tips which bear on the valve stems ; the rollers themselves are supported on roller bearings, and a nipple is fitted for lubrication purposes. The rocker bracket is anchored on the cylinder in such a way as to ensure a constant clearance between the rocker tip and valve stem. A notable increase in power having been obtained by these alterations, the engine (which has passed the Air worthiness Type Test) is now rated at 800 h.p. at 1,500 ft. at 1,700 r.p.m., whereas the old four-valve model was rated at 800 h.p. at sea level, at the same speed. ARMSTRONG WHITWORTH AIRCRAFT A great deal of useful work and development has been carried out at the Whitley works of Sir W. G. Armstrong Whitworth Aircraft, Ltd. The works themselves have been enlarged by the addition of a new machine shop and a new drawing office, both buildings being of modern design. The design of the four-engined monoplanes for the African section of the Imperial Airways' London-Cape Town route has been completed, and the construction of 28
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