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A prime example:Starting on June 22 1940, in co-operation with de Havilland, the RAF mounted a crash program to ensure all of its frontline Merlin engine fighters were fitted with Constant Speed propellers
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Not a prime example, a very atypical example and heroic effort on the part of DeHavilland.
I am sure you would love to think this was normal.
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a small shaft drive to connect it to the engine; four external engine oil pipes; a complete cockpit control with conduit, and detail parts.
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Is extremely easy when compared to the technical level of producing a cylinder head.