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Aviation History
1919
1919 - 1047.PDF
AUGUST 7, 1919 that on the left feeding the four bottom engines, whilst the other supplies the two top engines. As the petrol supplied to these distributors is more than that used by the engines, .—. — -g, . , Fig. 40.—230 " Puma " (Siddeley). Fig. 41.—80 Gnome. Fig. 43.—A.B.C. Dragonfly. the extra amount passes up to four small gravity tanks which will be seen in the illustration, and which are situated in the planes. These hold about 15 gallons each. As the excess of petrol continues the gravity tanks overflow through return pipes into the main collector. In these pipes flow indicators are fitted in order that the engineer may see that the system is properly working. After the main tanks are empty and no more petrol is supplied to the'distributors, the petrol flows from the gravity tanks into the junction boxes, which ensure a further 60 gallons. The two junction boxes are fitted with indicators to show the pressure or head of petrol supplied. They are also fitted with relief valves discharging back into the collector. The collector is also fitted with a large filter, through which all the petrol passes on its way to the engine. A great deal of progress has been achieved in the general arrangement of the engine and its cylinders so that the most effective use is made of all the material. With cylinders in line the deadweight loss per horse-power will rapidly decrease after the first cylinder, but after about four cylinders the economy to be gained by adding more cylinders practically ceases owing to the increased size of crankshaft and bearings required to resist torsion. This naturally leads to grouping the cylinders in two rows in V form working on a common crankshaft with two connecting-rods to each crank pin. Many such engines have been made with two rows of either Fig. 42.—Bentley rotary. Fig. 44.—80 Renault. H
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