a study of propellor heads, part i.

\eta = \frac{\hbox{propulsive power out}}{\hbox{shaft power in}} = \frac{\hbox{thrust}\cdot\hbox{axial speed}}{\hbox{resistance torque}\cdot\hbox{rotational speed}}

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Photographs taken on July 3, 2012

Harriman and West Airport

North Adams, Massachusetts

By Maggie Clark

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