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Posting a reply to: RE: Prop and or RPM question

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VMS Steve

Posted 8/5/2009 10:07 PM (#392607 - in reply to #392482)
Subject: RE: Prop and or RPM question

Hiya,

From the sounds of it, the boat seems to be over-propped, but when I used the numbers and checked what kind of slip factor you would have, the numbers do not match up. So...couple of questions: First, is the speed a GPS reading or the dial speedometer on the boat? Second, you mention the anti-ventilation plate is right where it needs to be...where exactly is it in relation to the lowest point on the hull? Third, what kind of load do you normally have in the boat (people, gas, gear, etc)?

One big question here...when you get on plane, are you trimming the motor out to lift hull out of the water more? If no trimming of the motor is taking place, there can be as much as 1000 RPM's gained right there, and that would be huge...

Lots of variables here, and if you can supply a bit more information on these questions, a better idea of what is going on can be had.

Steve