Posts: 3508
Location: Elk River, Minnesota | Hiya,
To start off, I have to say I am a bit confused... If you have a 115 on the back, I don't think there will be any possible way to get to 55mph on a 1400 pound boat. A 150 might be right in that zone, though, so I am hoping that was just a typo.
Either way, I am guessing a 19 pitch would be about right as well. The 115 has a 2.07:1 Ratio, so turning max RPM of 5750 with 10% slip, I see about 45mph....that is about the best I would think any 115hp motor could get on a boat of that size and weight....breaking 50 would be extremely hard to do. But just for giggles, using a 24 pitch prop, it would come out to be right about 56mph.. I just don't think that is going to happen...
With the 150 hp, same numbers except gear ratio: 1.87:1 it comes up as just a tad under 50mph.
So....do you happen to recall what your RPMs were with the 14 pitch? and...could you verify the motor hp? That 115 just doesn't sound right...
Steve
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