e/Propeller speed reduction unit

Information
has gloss	eng: A Propeller Speed Reduction Unit (PSRU) is a gearbox or a belt and pulley device used to reduce the output revolutions per minute (rpm) when compared to the higher input rpm of the powerplant. These arrangements allow the use of small displacement internal combustion automotive engines to turn propellers within an efficient speed range.
lexicalization	eng: Propeller Speed Reduction Unit
instance of	e/Propeller#Marine