(definition) by Webster 1913 Thu Jan 19 2006 at 8:03:02

Tractor screw or propeller . (Aviation)

A propeller screw placed in front of the supporting planes of an aëroplane instead of behind them, so that it exerts a pull instead of a push. Hence, Tractor monoplane, Tractor biplane, etc.

 

© Webster 1913

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