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Old 04-25-2014, 08:48 AM   #2
Veteran Member
City: Green Cove Springs, FL
Country: United States
Vessel Name: No vessel
Join Date: Jan 2014
Posts: 44
From your post, it appears that WOT on your engine is supposed to be 3800 rpm. While cruising, push to WOT (only for a few minutes or you'll get really hot) and check your rpm's. If you hit close to 3800 rpm at WOT then it doesn't matter what speed you reach, you are spinning the right sized and right pitched prop.

If you are not able to hit 3800, then you should either decrease the diameter or pitch. A one inch decrease in pitch will increase the rpm by about 200.

If you hit over 3800 rpm, you should increase the pitch or diameter. Of course, if you are using the boat for skiing, tubing, etc, you may want a faster hole shot and should keep the prop/pitch a little smaller. You'll give up a little bit of top speed though.
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