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Aviation History
1940
1940 - 1645.PDF
FLIGHT, JUNE 6, 1940. Advt. vi & vii Outstanding features of the DE HAVILLAND HYDROMATIC quick feathering airscreu) UPENDED BLADE ROOT It is well known that in any mechanical structure rapid changes of section are to be avoided, and that a sheer stress can best be taken across the grain of the material. In all de Havilland controllable-pitch airscrews the blade root is upended in the process of forging so that it forms a large smooth radius on the exterior (a), thus providing a shank to take the centrifugal loads with the least possible stress concentration. The upending process also turns the grain of the metal so that it is at right angles to the sheer stress occasioned by centrifugal force.
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