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Prop and speed calculator

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Old 09-09-2006 | 07:47 PM
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Default Prop and speed calculator

Can someone post the calculator for prop, rpm, and gear ratio calculations.
Thanks
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Old 09-09-2006 | 07:56 PM
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Default Re: Prop and speed calculator

http://www.go-fast.com/bam_marine_knowledge_base.htm

This what you are looking for, or the formula?
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Old 09-09-2006 | 08:54 PM
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Default Re: Prop and speed calculator

The formula
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Old 09-10-2006 | 09:14 AM
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Default Re: Prop and speed calculator

Originally Posted by RBeyer
The formula


(Pitch x RPM) / (Reduction x 1056) = MPH.




Doug
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Old 09-10-2006 | 09:59 AM
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Default Re: Prop and speed calculator

Originally Posted by Boatally Insane
(Pitch x RPM) / (Reduction x 1056) = MPH.

Doug

I'll bet you can calculate the #s is your sleep by now
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Old 09-10-2006 | 10:58 AM
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Default Re: Prop and speed calculator

Thanks, I used to have it and lost it.
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Old 09-11-2006 | 05:48 PM
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Default Re: Prop and speed calculator

Merc. has had a "slide rule" calculator available that lets you check everything quick and easy. The Merc. part # is: C-90-86147, and includes some real good, basic, "don't kid yourself" instruction. Hope that # is still available cause it eliminates just so much B.S.! --- Jer
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Old 09-12-2006 | 11:38 AM
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Default Re: Prop and speed calculator

This site is pretty cool.
http://www.rbbi.com/folders/prop/propcalc.htm
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Old 09-13-2006 | 09:35 PM
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Default Re: Prop and speed calculator

Nice site. Thanks
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Old 09-16-2006 | 03:05 PM
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Default Re: Prop and speed calculator

Originally Posted by jeffswav

doesent work for above 100mph
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