tractor screw

Tractor screw

Tractor screw\ or propeller \propeller\ (Aviation) A propeller screw placed in front of the supporting planes of an a["e]roplane instead of behind them, so that it exerts a pull instead of a push. Hence,

Tractor monoplane,

Tractor biplane, etc.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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