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Aviation History
1941
1941 - 1384.PDF
420 FLIGHT JUNE 1941. THE LIQUID-COOLED ALLISON Ths shaft froni the engine to the reduction gear is 8 it. long and is supported at the centre in a seli-aligning ban-o«cu n.> reduction gear and pinion gear. Reduction gear is an, external spur gear bolted to a flange on the airscrew shaft, which is supported at the front by the thrust bearing and at the rear by a large roller bearing. The pinion gear is mounted between two roller bearings and is driven by the extension shaft through an internally splined flexible coupling. Reduction gear teeth are lubricated by an oil nozzle supplying three jets of oil directly on the teeth. A combined pressure and scavenge oil pump is mounted on the front of the reduction gear housing and provides oil pressure to the oil nozzle and scavenges the case. Oil is supplied for the reduction gear system from an external tank. Drives are provided on the rear face of the reduc- tion gear box for two gun synchronisers, one hydraulic accessories oil pump, and an airscrew governor. Drive for the overhead camshafts is provided by a gear train which starts at the rear end of the crankshaft, and drives through the hydraulic vibration damper, then in order, an idler gear, a combination spur and bevel gear, and inclined drive shafts to the camshaft of each cylinder head. Pistons are machined from aluminium alloy forgings and the underside of the piston heads are grid-ribbed to facili- tate cooling. Connecting rods are of the fork and blade ' type, of I-section construction, machined and polished all over. Two rods are mounted on each crankpin, with a single split steel back bearing faced with lead bronze inside for crankpin bearing and outside for the blade rod bearing. The cast magnesium alloy accessory housing is mounted directly on the rear of the crankcase and contains the centrifugal supercharger and the drives for the coolant, oil and fuel pumps ; the camshafts, and generator and two vacuum pumps. Supercharger impeller is 9.5m. diameter and is driven at 8.8 times crankshaft speed. Carburation efficiency is obtained by curved vanes in the diffuser passage as well as rotating guide vanes on the impeller. The supercharger impeller shaft is supported on 2 steel back lead bronze floating bearings and the supercharger is driven from the flexible inner member of the hydraulic vibration damper. The engine starter is located on the lower right side of the accessory housing and cranks the engine through the outer rigid member of the hydraulic damper. The oil pump is also driven from the starter shaft by- a bevel gear. Vacuum pump, generator and fuel pump drives are located on the rear of the engine at the left; the coolant pump is located on the bottom of the accessory housing at the left, and the tachometer drive and a second vacuum pump drive are located at the left, of the housing. A Bendix-Stromberg two barrel pressure injection type carburettor with automatic mixture control is mounted on the rear of the accessory housing and supplies the fuel-air mixture to the supercharger, which delivers the mixture to the ramming-type intake manifolds which contain grids to prevent back-fire flames from reaching the supercharger. Ignition is supplied by a fixed timing Scintilla double magneto, current from which is distributed to the spark plugs through two separate camshaft-driven high tension, distributors. When the engine is enclosed in a tight cowl, cooling air for the exhaust plugs is supplied by an alu- minium alloy manifold. Specification for Allison V-1710-E4 Engine: 60 deg. Vee type; geared; high temperature ethylene glycol cooled. Maximum normal rating £S8o h.p. at 2,600. r.p.m. at sea level; 1,150 h.p. at 3,000 r.p.m. at 12,000ft. Cruising rating 1,000 h.p. at 2,600 r.p.m. at 10,800ft. Power available for take-off 1,150 at 3,000 r.p.m. at 45.5111. Hg. Compression ratio 6.65 :1 ; blower ratio 8.80:1; airscrew reduction gearing 1.80:1. Bore 5.5m.; stroke 6in.; displace- :i ment 1,710 cu. in Length 194m. (with ext. shaft and gear box) ; height 36.4m.; width 29.2m. Weight (with carburettor and screen, radio shielding, spark plugs, magneto, exhaust, flanges, gun synchronizer and tachometer drives, spark plug cooling tubes, primer lines system, oil strainer, oil and co^Hst...: pumps') 1,400 lbs. Weight in lbs./h.p. 1.22. fuel consump--" tion 0.62 lb./b.h.p./hr. Oil consumption 0.025 lb./b.h.p./hr. SIGNIFICANT AIRLINE TRANSACTION "PURCHASE of an interest in airlines by the Canadian Pacific •L -Railway Company was announced as follows in Sir Edward Beatty's recent presidential address at the annual meeting in Montreal. "In 191-9 your company was authorised to engage in the business of transport by air, subject to the provisions of the appropriate legislation and the regulations of the authority provided by law. In 1930 your company and the Canadian National Railways each acquired $250,000 of the capital stock of the Canadian Airways, and the president of each railway company joined the Board of Directors of that company. The company was then controlled by the lat^ James Richardson and is still controlled by the Richardson Estate. "In 1940 your company acquired some additional treasury stock of the Canadian Airways, but none of the Richardson stock has been acquired by your company. Mention was made at the annual meeting on May 5, 1937, of the failure of negotia- tions towards participation in Trans-Canada Air Lines. " Recently, in order to provide air traffic connections with your railway and to remedy as tar as possible a somewhat chaotic competitive situation in the field of air transportation, particularly iii Western Canada, your company has acquired a majority interest, m Mackenzie Air Service, Ltd., Yukon Southern Air Transport, Ltd., Starratt Airways and Trans- portation, Ltd., and Ginger Coote Airways, Ltd., and if now engaged in reorganising their operations. "These steps have been taken with the concurrence of com- petent authority. None of these companies are engaged in ser- vices wirfch are competitive with those of Trans-Canada AT Lines but they perform valuable functions complementary boi.i to the services of that company and those of your raihva\. "In 1940 your company's Air Service Department was created under agreement with the British Ministry of Aircraft Production to assist in the movement of bombers to*1 England and the delivery of them there to the R.A.F. Your compaiy j is acting under the instructions Of the British Ministry, whooe agent it is, "anH must, for obvious reasons, observe the strictt.-t secrecy as to its operations." 1
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