The general efficiency curve for air propellers:
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Bibliographic Details
Main Author: Diehl, Walter S. (Author)
Format: Book
Language:English
Published: Washington NACA 1923
Series:United States / National Advisory Committee for Aeronautics: Report 168
Physical Description:11 S. graph. Darst.

There is no print copy available.

Interlibrary loan Place Request Caution: Not in THWS collection!