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Date Posted: - Sunday - 03/11/07 - 7:28pm
Author: GaptnGary
Subject: hull speed

I'm powered by a perkins 4-107 ( like most ) in my Mariner 40. Have a cruising speed of 5 .2 knots at 2200 rpm.. Was wondering what others are getting for motoring speed on their 40's.

Thanks for your replies... CaptnG

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Replies:

[> Hull Speed -- Mike Anthony, - Monday - 03/12/07 - 7:42am

I recently installed a Westerbeke 64 with a 19X15 prop, this pushes my 40 in calm water to 6 to 6.5 knts at 1800 RPM.


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[> [> Hull Speed -- Greg D., - Friday - 03/16/07 - 5:59pm

5.2 knots at 2200 rpm?? That's pretty good. What size is your prop? how much fuel do you burn? I get 5.6 knots, but I have to turn 3200 rpm to get there. It is within the specs for the engine (4-107) but I don't like to wind a diesel that tight. I burn about a gallon an hour and have a 17 inch 11 pitch 3 bladed prop. I have always felt "underpropped", as I can easily push the engine faster than it is supposed to turn.


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