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Aviation History
1940
1940 - 1047.PDF
FLIGHT, APRIL II, 1940 Advt. v )utstanding features of the )E HAVILLAND iYDROMATIC •' •• •-'• • ..•3T quick feathering airscreu) ade rotation is proportional to piston vel throughout the constant - speed ige. The cam-and-gear method of trans- ision allows the blade-rotation rate to related to the lineal piston movement the designer wishes. In the standard rdromatic a straight cam is chosen so as to keep this relation unchanged throughout the constant - speed range. This ensures accurate and consistent governing. A different cam angle over the pitch range used for feathering gives the four-times-faster action that is wantea' for this emergency use.
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