The BIIIG pistons had even slower-turning props.
For example - P&W R-4360-4
Max crankshaft RPM = 2700
Reduction gear ratio = 0.425
Resulting prop RPM = 1148
Other R-4360s had gear ratios as low as 0.333, for prop rpm = 900.
Last edited by barit1; 4th November 2012 at 01:25.