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  1. #1
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    Checkmate predictor with 115 merc i6 prop recommendations

    I'm currently running a Michigan wheel Apollo 13/21 which will run 55-56mph I currently jumped the motor two holes And I might grab another prop to try I wanna get rid of the walk so I'm trying different setups,I'm looking at the Michigan wheel ballistic 13.5/22 If anyone has ran one or has some info on a better prop please chime in thanks!

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    Quote Originally Posted by SS Minnow View Post
    Kind of hard to give any kind of recommendations without knowing how many RPM's you are at with that prop at that speed. I have a Checkmate Trimate and it runs way better with a high rake prop. My best is a 24 pitch 3 blade Raker that I get about 60 out of it at around 6k rpm. I have a 19P 4B Renegade that will hit about 55 then it walks really bad. So bad it is either let off or stuff it. I was at around 5800 with the prop now so I jumped the motor up two holes so I would think I need more pitch two holes up is still 4- 4-1/2 below the pad I did put a pressure gauge to monitor

    I am running OMC and have no idea what the Merc equivalent is, but it would not be hard to figure out. Also, if you are raising the motor up, are you sure you still have water psi? A gauge is cheap insurance, easy to install. It can be hard to see the pisser when going 50+ mph. I also found that at a certain height I would lose psi when turning left, but not when going straight or to the right.
    I was around 5800 With the prop now after going up two holes I figure I'll need more pitch and it's still little more than 4 inches below the pad. I also hooked up a gauge

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    115 prop shaft or crankshaft?

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