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Aviation History
1918
1918 - 0096.PDF
interesting ; the gas is led to the centre of the engine by the ioo-mm. pipe : the gas then enters a branch pipe 70 mm. in diameter through a port 100 mm. in diameter. Thence the two branch induction pipes lead outwards to the six inlet ports of the cylinders, which are 85 mm. long and 50 mm. wide. Fig. 22.—Arrangement of air pump. Ignition.—Two Bosch magnetos, type Z.H.6, are mounted on a transverse bracket at the rear end of the crankcase, one being a starter mag- neto, used in conjunction with a hand starter dynamo. The magnetos are driven direct by bevel gears off the vertical camshaft driving shaft, the direction of rotation being anti- clockwise in both cases. The arrangement of the magneto driving gear is shown in the cross- sectional drawing (Fig. 6). All 12 sparking plugs are fitted on the inlet side of the engine, and are situated directly below the inlet valves; the H.T. wires are carried in two fibre tubes attached to the sides of the cylinders on the inlet side. Air Pump.—Details of the air pump are given in the scale sectional drawings, Fig. 23. The air pump is driven off the front end of the camshaft, the bore being 26 mm. and the stroke 27 mm. An adjusting screw is fitted above the release valve of the pump for regulating the strength of the spring, the released JANUARY 24, 1918. pressure being taken through the hollow stem of the adjusting screw. An oil trap is provided just below the air pump to retain any surplus oil which may find its way past the air pump valve and into the pressure pipe. . . Water Pump.—The water pump extension shaft is driven through a vertical shaft off a bevel gear on the end of the crankshaft, and in the same vertical axis as the camshaft driving shaft; it is attached by a flange to the bottom of the sump, next to the oil pump. The constructional details of the water pump are given in the sketch (Fig. 24). The pump is of the centrifugal type, employing a rotary vane disc, the water entering below the bottom flanged cover through a 44-mm. port, below the rotor, and the water is delivered centrifugally from the vanes between the top and bottom of the rotor, which is also fitted with vanes upon its top side to throw the water away from the spindle. Instead of packing glands, a hardened steel friction washer is let into a recess machined in the upper face of the rotor, and is kept in uniform contact with the face of the phosphor-bronze spindle bush by the action of a light spring, which is fitted under a ball thrust race at the driving end of the spindle. The diameter of the outlet passages from Fig. 23.—Water pump, with greaser and its actuating ratchet. the water pump to the cylinders is 44 mm. Double inlet water connections between each of the six cylinders supply the water jackets at top and bottom, the diameter of the steel water circulation being 40 mm. „. : (To be concluded.) Fatal Accidents. WHEN Lieut. Wise and Lieut. Payne, of the R.F.C.,were starting on a flight at Hendon Aerodrome on January 13th, the machine caught fire, and both officers receivedinjuries, from which they died. At an inquest on January 15th on 2nd Lieut. A. McDowall,E. Lane. Regt., attd. R.F.C., who was killed on January 12th, by a fall from a balloon, a verdict of " Accidental death " wasreturned. It was stated in evidence that the balloon in which Lieuts. Dean and McDowall were observing, lost its stabilitythrough an unknown cause, and fell across the cable of another balloon, cutting the suspenders of the basket. Mr. Deanjumped clear with his parachute, but Mr. McDowall got en- tangled in the rigging on the other side of the car, and fellSoo ft. to the ground, being killed instantly. Three R.F.C. officers were killed in an aerial collision on January 19th in the vicinity of an aerodrome. Their namesare : 2nd Lieut. L. Macdonald, vfho was piloting a single- seater, 2nd Lieuts. C. E. Rowley and W. R. Bailey, pilot andobserver of the second machine. There was a strong breeze blowing at the time, and the atmosphere was rather hazy,but details are lacking as to how the machines came together. While an aeroplane was passing at a fair height over Martins Road, Shortlands, Beckenham, on January 19th, one wing apparently doubled up, and the machine, turning rapidly over and over, crashed on to the top of some houses. The occupant of the machine, Captain Sharpies, when picked up was found to be dead. At the subsequent inquest a verdict of *' Death from Misadventure " was returned. While flying over Salisbury Plain, on Jan. nth, Lieut. G.Heasman, R.F.C., was killed. 92
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