2016 Powerboat Guide says 19 to 20 knots cruise and 24 knots wide open. One clue to whether you are over propped or not is how close to the 24 knot top speed you are getting at wide open throttle. If you are near the 24 knots with low rpms then you are probably over propped. If 2200 rpms gives you closer to the advertised cruise speed then you more likely have an engine problem.
In the circumstance you are over propped the engine is overloaded. In the other circumstance the engine is just not making the power. It has been my experience over the years dialing the props in for the last couple 100 rpms doesn't drastically change top speed. It just matches the load better to the engines capability.
FYI those engines should turn 2,600 rpms according to boatdiesel.com
Originally Posted by yoeman
I'm guessing I'm not the only guy that has purchased a bank repo with no sea trial so not sure why that's coming up
The Bayliner37 with 250 hp 6bta was slightly under powered from what I read so I was looking for info on prop pitch and performance numbers like cruising rpm and speed
I have had a ton of good info on this site that helps me trouble shoot
Yes I have had 2 bayliners that are not great performers but I still enjoy boating and love the 3788
Thanks for all the help
I'm going to look at the props then post back with real numbers