Aircraft-Propeller Development and Testing Summarized 340105

THIS paper treats briefly the aerodynamics of the aircraft propeller, including the effect of selection of the airfoil section, the plan form and the aspect ratio. The aerodynamic characteristics of the propeller as a whole are discussed with some reference to the effect of tip speed and body interference.
The stress analysis is dealt with, and methods of measuring the vibration stresses are described in some detail. A short analysis is made of the properties and advantages of some of the materials used for propeller blades.
An outline of the development of the control-lable-pitch propeller follows, together with a description of the present-type of hydro-controllable propeller now in use throughout the world. In conclusion, the paper deals with methods of testing propellers to assure their safety in service.


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