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 Post subject: Slow at full throttle
PostPosted: Sun May 25, 2014 5:21 pm 
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I have a 1982 40hp mercury with a new prop I took it out today when I took off the rpm will go all the way up but the boat is bearly moving ( maybe 5 mph) the only thing new is the prop and control box ... Please help


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PostPosted: Tue May 27, 2014 12:18 pm 
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Location: Lake Murray SC
New as in brand new - could be that the rubber hub in the prop is bad or it could be the wrong size ( too small)

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PostPosted: Tue May 27, 2014 12:27 pm 
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Yea it brand new 4 bladed prop


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PostPosted: Tue May 27, 2014 12:30 pm 
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When the motor is at full rpms dose that mean the prop is spinning that fast to


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PostPosted: Tue May 27, 2014 12:32 pm 
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Someone told me it could be the high speed jets dose that make sines


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PostPosted: Mon Jun 02, 2014 11:31 am 
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Is the prop the same size as the old one that was on it?

Your prop has to match your boat motor combo.

Example -

If your boat originally had a 14 pitch prop on it and it ran 25 mph at 5500 rpm. You purchase a new prop that is a 9 pitch you may only run 8 mph at 5500 rpms. You purchase a 17 pitch prop and it runs 26 mph but only at 4200 rpm.

Everything has to match to get the best all around performance. Smaller prop will accelerate quickly but you lose top end. Bigger prop runs faster but has poor acceleration.

Hope this helps..

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