uncleflo
Registered since September 28th, 2017
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Thread: engine rpm v propshaft rpm? - YBW
Saved by uncleflo on October 6th, 2019.
On a typical sailing boat with shaft drive, does the prop turn at engine rpm? Or is there a reduction? And when the prop freewheels while under sail, what would be a typical rpm? Presumably for a given boat speed (whether sail or power), the prop rpm will be less under sail than the rpm under power for the same boat speed, and presumably this ratio is closely linked to the propeller efficiency. I know on aeroplanes that prop efficiency is around 85% - is this a realistic figure for water-screws?
marine engine power forum conservation result time sail typical shaft drive version propeller freewheel boat yacht discussion
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