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Aviation History
1939
1939 - 0088.PDF
FLIGHT. JANUARY 12, 1939 45 & Installation drawings ot the Napier Dagger VIII. solid steel forgings, nd have a main beanng between each throw. Eight plain lead-bronze bearings are provided for each shaft. Each crank has a connecting-rod assembly comprising a forked rod with a fixed lead-bronze-lined steel bearing shell and a plain rod oscillating on the outside of the shell. Phosphor-bronze is used for the gudgeon-pin bushes. Pistons are aluminium alloy forgings and incorporate two gas rings, two scraper rings and a hollow fully floating gudgeon pin. The close-finned steel cylinders, which have a bore and stroke respectively of 97 mm. and 95 mm., are machined all over and are provided with heads of forged aluminium alloy likewise machined. The heads, with their sparking-plug adaptors, stellited valve seats and passages for inlet and exhaust valves, are assembled as a unit with the cam shaft casing. Between each cylinder and its head is an aluminium sealing ring. (Left) A view show ing how the mixture is dis tributed from the double- entry super charger (Right, With spinner and nose cowl in place the Dagger VIIi takes on a new air of impres-siveness This frontal view shows its extraordinary compactness.
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