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Aviation History
1911
1911 - 0258.PDF
(TfcWHT) It is of the 4-cyl. " V " type and capable of developing 50-h.p. at 1,250 r.p.m. It is water-cooled and has cast iron cylinders with electrically-deposited copper water-jackets. The bore and stroke are 3Ji ins. by 4J ins. respectively, and the weight complete is 150 lbs., or 3 lbs. per horse-power. The point of special interest in this engine is the means employed for the complete scavenging of the cylinders between each firing stroke, for it is in this direction that the orthodox type of two-stroke engine proves lacking in efficiency. A special form of " Roots blower," which is a kind of centri fugal fan, is used for this purpose and is divided into two parts, one part dealing exclusively with fresh air, which is pumped into the cylinders immediately after the completion of the firing stroke* so scavenging out the exhaust gases, and the other part delivering an explosive charge into each cylinder in turn at a predetermined instant of time. Renault (STAND 39).—The 50-60-h.p. engine exhibited is of the type that carried off the last Michelin Cup. The general arrangement is well known. The eight cylinders are arranged in V form. The valves are of the overhead type, controlled, one directly and the other by an overhead cam-shaft. Ignition is by magneto, turning at the speed of the motor, and lubrication is by interior oil circulation, without forced feed. An interesting characteristic of this motor is the fact that the propeller is attached to the cam-shaft, which is constructed specially strong for this purpose, and not to the crank-shaft. The propeller, therefore, turns at half engine speed. The cooling is effected by the use of a centrifugal fan, which forces a strong current of air into the chambers formed by the cylinders and the casing which covers them. This system has been found entirely satisfactory in practice. MARCH 25, 1911. Wolseley (WOLSELEY TOOL AND MOTOR CAR CO., LTD.) (STAND 51).—Constructed in two types, the 120-h.p., suit able for both aeroplanes and dirigibles, and the 60-h.p. Both have eight cylinders arranged in V form, and are practically identical in the system of construction. The 120-h.p. model has a bore and stroke of 5 ins. by 7 ins., and the corresponding dimensions of the 60-h.p. are 3 j- ins. by 5$ ins. The following particulars apply to both types :— The cylinders are cast separately and mounted at an angle of oo° on an aluminium crank-case. The cylinder- jackets are of spun aluminium, screwed and jointed to the combustion heads, the bottom joint being made by means of a dermatine ring. Mechanically-operated valves are employed, controlled by means of a single cam and rocking- lever—this rocking-lever is operated from the cam-shaft by means of a plunger and tappet-rod. Gears and cam-shaft are totally enclosed. Ignition is by Bosch dual system. Water circulation is maintained by means of a positive-gear pump. Lubrication is of the forced system in which oil is con tinuously circulated by rotary pumps, one pump drawing oil from a separate tank and forcing it to all important bearings. The other pump draws oil from the crank-chamber and returns it to the separate oil tank. The gudgeon-pins and cylinder walls are lubricated by splash. Try-cocks are fitted where necessary and oil-pressure gauges are fitted. The weights are approximately 580 lbs. for the 120-h.p. and 300 lbs. for the 60-h.p., including, in both cases, the magneto, wiring, plugs, all water-pipes on engine, water- pump, oil-pumps, piping and connections, but not the fly wheel. CQiGr?rF?fl|p))f jg • ggg in ACCESSORIES. Aerial Engineering; Works, of Calbourne Road, Balham (STAND 3), have on view flying models and scale models, also model engines of J-h.p. to J-h.p., also " Fairy" high-flying monoplanes and propellers, as well as the Chinnock direct- lift machine (not a helicopter), an experimental model. In addition a full-sized 7 ft. 8 ins. Chauviere tractor suitable for an Anzani-B16riot. Aeroplane Supply Co.—the Aviation Section of the MOTOR SUPPLY CO.—(STAND 2), besides showing the well-known " Asco" propellers, have a very large assortment of " Asco " British-made accessories and parts, including aluminium lugs, wire strainers, piano wire, shock absorbers, wheels and tyres, fabric, &c. A corner of this exhibit is devoted to the booking of passenger flights at Brooklands or Hendon, and also for business connected with the aviation schools at Hendon. Special terms are being arranged for naval and military officers desirous of obtaining the Aero Club pilot's certificate © vy <^^H& An excellent assortment of "Asco" aluminium lugs. in order to comply with the new Army regulations concerning the Air Battalion. Allen. Knight and Co., Ltd. (STAND 33) fine collection of aeroplane models. The exhibit comprises models of all the best- known types of mono plane and biplane. They are also showing all kinds of model accessories, such as wheels, propellers, spe cial waterproof silk for both models and full-size machines. Messrs. Allen, Knight and Co. are also show ing " Marlboro' " and " Beney" propellers, and samples of the workman ship which they put into their full- size machines. Almagam, Ltd.,THE NEW MOTOR AND GENERAL RUBBER Co. (STAND 37), are showing rubber goods, such as aero plane tyres, shock - absor - bers, and acid resisting tubes, suitable for conveying pe trol and lubri- catingoilunder pressure. Blackburn Aeroplane Co. (STAND 45), show a large assortment of aeroplane accessories, in hibits. These consist of exhibit a very Two " Asco" propellers by the Aeroplane Supply Co., Ltd. addition different to their other sizes of wheels for 260
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