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Old 11-27-2020, 04:07 PM   #21
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MS 400 Speed

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Originally Posted by OldDan1943 View Post
speed through the water or speed over ground?
My speed reference is SOG using GPS at slack tide, late in the season so marine growth might be a contributor to resistance thru the water.
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Old 11-27-2020, 08:16 PM   #22
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I am not sure I understand the screenshot above...we have a 2006 Mainship 400 with a single Yanmar 6LY2AN-STP 440 HP and we run about 2500 RPM, 8 to 9 knots, it shows 9+ GPH at 2500 RPM?....am I reading that right?

I thought it was more like 3 to 3.5 GPH.....
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Old 11-27-2020, 10:54 PM   #23
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You are not running a 440hp @2500. Rpm @3.5 GPH. More like 1 MPG or less
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Old 11-28-2020, 05:02 AM   #24
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I had a Mainship 400 with the same Yanmar 370 hp engine. I couldn't get it above 12 kts. with two aboard at full throttle. I've never seen 15 kts in the boat.
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