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Old 07-31-2015, 02:52 AM   #19
Trundlebug
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City: River Trent
Country: UK
Vessel Model: Profile 33
Join Date: Jul 2015
Posts: 31
My FD boat has a plate near the helm, placed by the engine manufacturer (Volvo Penta). It says:-

"Cruising speed 200rpm below obtained top speed"

Whilst I wouldn't dream of contradicting the expertise of the engine manufacturer, obtained top speed will be at max revs - 3600rpm officially, although it's deliberately a bit overpropped for comfort, so a bit less than that. There's no way I could cruise at 3400 rpm!

I generally cruise at around 2000rpm, or 7.1 kn which seems the best speed for noise / vibration / speed / fuel consumption compromise.

I'm told maximum speed is around 8.5 kn with a huge wash, but I haven't been brave enough to try it, there doesn't seem much point in stressing the old girl unnecessarily.
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