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propeller speed reduction unit
A propeller speed reduction unit is a gearbox or a belt and pulley device used to reduce the output revolutions per minute (rpm) from the higher input rpm of the powerplant.〔Gunston 2006, p. 82.〕 This allows the use of small displacement internal combustion automotive engines to turn aircraft propellers within an efficient speed range.
==History and operation==
The Wright brothers recognised the need for propeller reduction gearing in 1903, but it was not generally used on aircraft engines until larger engines were designed in the 1920s.〔 Large engines with high crankshaft speeds and power outputs demanded propeller reduction, pilots noted the increase in performance of similar aircraft fitted with reduction gearing.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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