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post #26 of Old 11-01-2007
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In this application torque, as in most sailboats, will be the main issue One thing is engine torque, another and most important is prop-shaft torque, in other words gearbox ratio and what prop it may handle.
The DV24 has a torque of about 55Nm in rpm range 1800-2400 and is delivered with either 2,5 or 3:1 gear box. That will give roughly 137,5 - 165 on the shaft.
If we compare to Yanmar 3YM20 and 3YM30 the figures will be:
3YM20 (21hp) 51Nm in range 2000 - 2600. Gearboxes:2.21,2,62,3,22:1.
121,5 -133,62 - 164.22Nm on prop shaft.
3YM30 (29Hp) 70Nm 2000 - 2500rpm, same gearboxes as above.
154,7 -183,40 - 225,4Nm.
My answer in this case would be if the attaced gearbox is 3:1, install it, You will probably have enough torqe and 'power'.
I have a 3GM Yanmar with a 2.62 gearbox, cruising wheight of 8000 kg (16000lbs) and run a 3-blade Flex-O-Fold prop. Top speed 7knots+, cruising 5kn at 2000rpm, in a Jeanneau SO37 -2002.
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