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Aviation History
1909
1909 - 0045.PDF
JANUARY 23, 1909. pump and the carburettor mixing chamber; the carbu- rettor itself is outside. The valve push-rods are operated by a cam-ring in the crank-chamber, and the propeller- shaft is driven by bevel gearing. The cylinders lie in one plane. R.E.P. Three models, having the same bore and stroke, complete the standard range. They have 5, 7, and 10 cylinders for powers of 20, 30, and 40-h.p. respectively. Antoinette. The manufacturers are specially building this year,- for aeroplanes, a 50-h.p. installation which is the same as is used in their own monoplane. It is peculiar for the system of "steam-cooling" that has been adopted ; the water being allowed to boil in the jackets but being subsequently condensed. Twelve litres •••4;-,' PARIS AERO SALON.—Two views of the 1O-cyl. 40-h.p. R.E.P. Engine. inlet and the exhaust. The valves in the cylinder-heads control the All are designed on the same principle (see The Auto- motor Journal, November 30th, 1907) with radial cylinders set in two planes upon a semi-circular base. The 10-cyl. engine, which is virtually two 5-cyl. engines in line, has four planes of cylinders, and there are cam- rings at each end of the crank-shaft. The induction and exhaust-valves are formed in one, and the exhaust-gases escape direct into the atmosphere through perforations in the valve-chamber walls. The valve in question is illus- trated by the accompanying dia- grammatic sectional sketch, and consists of a peculiar-shaped hollow piston, A, operated by a central stem and having a port, A1, and an ex- ternal lip or ridge, A2. The piston works between a fixed internal sleeve, B, and the outer valve-chamber casting, C. The arrows show the direction of the gases, those on the right indicating the path of the fresh mixture and that on the left the path of the exhaust. When both valves are closed, the flanged head on the bottom of the piston comes up against the seating on the valve-casing, which thus takes the pressure direct during the explosion stroke. J.A.P. British-built 8-cylinder V engine. The cylinders are made of cast iron, and are air-cooled by perforated fins. The base is made of aluminium, and supports the cam- shaft outside between the cylinders. All valves are operated mechanically. • , of water are carried in a small cylindrical tank and the water is pumped through the jackets, where it becomes more or less converted into steam by the time it returns to the tank ; the jackets are electrolytically deposited in copper. Only the exhaust-valves are mechanically operated, the induction-valve is atmospheric. On one end of the crank-shaft is the propeller, and or* the other is the water-pump. The cam-shaft is driven by exposed gears and drives the fuel-pump which injects- petrol into each induction-valve chamber. The fuel- pumps (there are two) have a variable throw by means of an eccentric mechanism. Accumulator ignition is- employed in conjunction with a distributor mounted between the cam-shaft and fuel-pump. PARIS AERO SALON.—View of the Antoinette installation, showingpart of the condenser used to convert into water any steam which is formed in the cylinder-jackets. 47 B 2
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