dischargedstream is less than the area of a section of the incomingair column, and it is assumed to be equal to the area sweptout by the propeller blades. The calculation of the thrust ofthe propeller from the axial momentum of the discharged aircan only be performed when we know the distribution… … 98 THE AEEOPLANE. nature and magnitude of the rotational motion renders theexact calculation of the torque, and therefore of the propellerefficiency, an impossibility. The thrust T of a propeller may be represented by 2(m?;),where m=the mass of an elemental volume of air in the dis-charge stream.…
Airplanes
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