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BajaRunner

06-20-2005 10:12 AM

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?

throttleup

06-20-2005 11:17 AM

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

bbladesprops

06-20-2005 04:58 PM

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.

throttleup

06-20-2005 05:41 PM

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

I got one from Jc Whitney that works pretty well.

Julie

onesickpantera

06-20-2005 09:25 PM

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

Quote:

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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