Originally Posted by d design
Yacht: 22ft, 18ft LWL, canoe stern, 1.56 tons.
Engine: Yanmar 1GM10
(Been fully serviced starts on first compression
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?
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