Considerations on propeller efficiency
By: Albert Betz.
Contributors: United States. National Advisory Committee for Aeronautics.
Publisher: NACA
Published: 1928
Place of publication: [Washington]
Number of pages: 23
Subjects: Propellers
Notes: Original German version: Der Wirkungsgradbegriff beim Propeller.

Zeitschrift fur Flugtechnik und Motorluftschiffahrt, April 28, 1928, p.171-177.