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Aviation History
1915
1915 - 0173.PDF
MARCH 12, 1915. I/J15I3 THE A.B.C. AUXILIARY MOTOR. A 6 H.P. PETROL ENGINE FOR ENGINE STARTING, AND FOR DRIVING LIGHTING, WIRELESS OR BLOWING SETS. WITH the gradual tendency exhibited in modern practice their chief engineer (Mr. Granville E. Bradshaw) have towards the development of larger and more powerful applied the results of their extended experience in aero- aeroplanes, especially those of the seaplane type, the nautical and high speed engine design upon the design desirability of providing some mechanical device which of their new auxiliary motor. will enable the pilot to start the engine, without outside The engine, which is of the two-cylinder opposed type, assistance, becomes increasingly evident. Coupled also is air-cooled, and develops its rated horsepower (6 h.p.) at 3,300 revolutions per minute, which corresponds to a torque of 115 lb. ins. The arrangement of the cylinders and cranks employed is such as to tend naturally to reduce vibration to the minimum; and the claim is made, that it is possible to hold the engine in the hand when it is running at a speed of 4,000 revs, per minute. The cylinders are of steel, machined from the solid bar; but the heads, which are de tachable, as may be seen from one of our photographs, are of cast iron—as are also the pistons—and are held in position by four steel studs. To ensure an entire absence of gas leakage at the joint between the head and the cylinder body, ample width has been provided for the jointing surface. All bear ings throughout the engine, with the excep tion of that at the small end of the con necting rod, are of either the ball or the roller type, and lubricating oil is supplied through adjustable drip feeds from an oil tank placed immediately over the engine. Provision is made for determining the level of oil in the crank-case by fitting two cocks in the lower portion, the upper of which gives the correct level of oil. The crank-shaft is a one piece forging of high tensile steel, as is also the single cam-shaft which operates the inlet and exhaust-valves in both cylinders, through the four hanging tappet levers, by two cams, thus giving perfect synchronisation and even running. The exhaust-valves are located in the cylinder-heads, and with the inlet-valves are so designed that, in the The 6 h.p. A.B.C. auxiliary motor viewed from the carburettor side. with this is the fact that the use of wireless apparatus is becoming more extensive on military machines; and where any night operations are contemplated, the utility of a lighting set for the purpose of signalling to or illumin ating the ground upon which the pilot may desire to land, will be readily appreciated. Weight and space are, however, important factors where the aeroplane is concerned, and with the object DETAILS OF THE 6 H.P. A.B.C. AUXILIARY MOTOR.—On the left is the ball-bearing camshaft with timing wheel in position; in the centre is one of the cylinders with the bead removed; and on the right is the chain wheel and clutch details for coupling up the motor to the engine. of producing an engine that would occupy the minimum of space, involve the smallest possible increase in weight, and be able to either turn the engine or drive the dynamo, according to the requirements of the moment, the A.B.C. Road Motors, Ltd.. of Hersham, Walton-on-Thames, and remote event of the valves breaking, the heads will not fall into the cylinder. The engine is supplied completely equipped ready for running, except for the connection to the petrol tank ; and the weight of 59 lbs. includes the magneto, Claudel 173 C 2
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