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Old 31-01-2015, 02:31   #1
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Over proped?

Yacht: 22ft, 18ft LWL, canoe stern, 1.56 tons.

Engine: Yanmar 1GM10 (Been fully serviced starts on first compression every time)

Prop: three bladed don't know dimensions

Engine revs to 2600 rpm at 5.5 kts SOG before black smoke. Should I be revving higher with this engine?

Cheers
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Old 31-01-2015, 03:41   #2
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Re: Over proped?

Quote:
Originally Posted by d design View Post
Yacht: 22ft, 18ft LWL, canoe stern, 1.56 tons.

Engine: Yanmar 1GM10 (Been fully serviced starts on first compression every time)

Prop: three bladed don't know dimensions

Engine revs to 2600 rpm at 5.5 kts SOG before black smoke. Should I be revving higher with this engine?

Cheers
sounds slightly over pitched if this is with a clean bottom and clean prop.

reducing 1degree of pitch should increase rpm by 200 rpm.

3000 rpm is top end for that engine, at about the 6knots hull speed

reving higher is likely to lag the engine as it is overloaded
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Old 01-02-2015, 00:42   #3
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Re: Over proped?

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Originally Posted by atoll View Post
sounds slightly over pitched if this is with a clean bottom and clean prop.

reducing 1degree of pitch should increase rpm by 200 rpm.

3000 rpm is top end for that engine, at about the 6knots hull speed

reving higher is likely to lag the engine as it is overloaded
Yes clean bottom and prop.

Cheers thanks for that
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