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Aviation History
1939
1939 - 0086.PDF
/ FLIGHT. JANUARY 12, 1939 HYDRAULIC TAPPETS mm CENTRE SHAFT TWIN SIX-THROW ' CRANKSHAFTS DOUBLE-TWELVE KA6NET0 DISTRIBUTOR FOR 24- SPARKING PLUGS THE NAPIER-HALFORD DAGGER VIM 24 CYLINDERS 1,000 H.P. Originally designated E.108, the latest Napier 24-cylinder engine is now known as the Dagger VIII. Rated and maximum powers are respectively 925 h.p. at 9,000 ft. and 1,000 h.p. at 8,750 ft., the latter figure giving an output per litre of 59 h.p. The arrangement of the 24 cylinders in H formation results in unusually low frontal area, which in relation to the power gives a figure of 175 h.p. for each square foot. This specially prepared Flight drawing shows such characteristic features as the twin crankshafts, hydraulic tappets and double-entry supercharger.
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