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Old 07-31-2015, 08:56 AM   #28
Heron
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City: Cypress Landing Marina (NC)
Vessel Name: Heron (2)
Vessel Model: '88 Cape Dory 28 Flybridge #115
Join Date: Nov 2014
Posts: 1,305
Quote:
Originally Posted by Trundlebug View Post
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"

obtained top speed will be at max revs - 3600rpm officially,
I generally cruise at around 2000rpm, or 7.1 kn which seems the best speed for noise / vibration / speed / fuel consumption compromise.

.
My Volvo is the same...and I also cruise at 2K at 7.5 knots or so. Seems the most comfortable for the engine and SD hull form and averages 2 GPH at that number. WOT at 3600 is around 17 knots
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