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GPS, Tach, and prop slip. Ones not right?

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GPS, Tach, and prop slip. Ones not right?

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Old 06-20-2005, 10:12 AM
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Default GPS, Tach, and prop slip. Ones not right?

I was running some #'s to get the props dialed in. The GPS should be right. when i do a prop slip calculator, im coming out with 3.5% of slip. I know thats not right, so i guess my tachs are not right. how do you verify your tachs are working true?
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Old 06-20-2005, 11:17 AM
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Default Re: GPS, Tach, and prop slip. Ones not right?

A Digital tach tool should be used to verify your tachs. Smartcraft is another form of verification.

Julie
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Old 06-20-2005, 04:58 PM
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Smile Re: GPS, Tach, and prop slip. Ones not right?

There are inductive tachometers the attach to a spark plug lead. Works just like a timing light. Most all marinas and dealers have them.
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Old 06-20-2005, 05:41 PM
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Default Re: GPS, Tach, and prop slip. Ones not right?

I got one from Jc Whitney that works pretty well.

Julie
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Old 06-20-2005, 09:25 PM
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Default Re: GPS, Tach, and prop slip. Ones not right?

Originally Posted by bbladesprops
There are inductive tachometers the attach to a spark plug lead. Works just like a timing light. Most all marinas and dealers have them.
Just used one of those and it worked great. My tach was off about 200-300 rpm at WFO.
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