Abstract
A controllable pitch propeller has a central huh which serves not only for the attachment of the blades but also contains the mechanical components to make the blades rotate. Ins i de the hub a translation motion is transformed into rotation of the blades. This involves large actuating forces sometimes amounting to three times the total thrust on the propeller.
Various types of blade suspension systems are described. The principles of crank-conrod, crank-slot, slot-pin and double-acting mechanisms are discussed in relation to their historical origin and development to modern conceptions. It is concluded that a sliding slot mechanism with slots in the rotating parts has favourable characteristics for application in normal and feathering propellers .
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