Posts: 3480
Location: Elk River, Minnesota | Hiya,
Assuming this is a crestliner deluxe jon boat?
When loaded just by yourself, do you have an idea of the rpms you are getting out of the motor at full throttle?
If you are over propped, the motor is not turning enough rpms to hold the bow up, thus the bow rises and falls. If you can try a prop with 2" less pitch, and potentially even a 4 blade prop, you should be able to get the porpoising to stop altogether without the need of a whaletail or a setback. The setback plate would allow you to raise the motor out of the water more, which will give you some RPM's (my gut instinct says this is what you are needing) and will make the center of gravity move back a little, thus making the boat trim more with less trim used.
Depending on where they mounted the motor on the boat (assuming they drilled and bolted), you might be able to move the motor up as well, but there is always a trade off... Moving the motor up gains speed, but increases slip, so the boat will not be as responsive in corners. If you do this with an aluminum prop that has no cupping, you'd be hard pressed to get things working.
Before anything, I'd consider a prop with lower pitch in the same diameter you have and see how the boat performs. If it's new, you should be able to go back to the dealer for the prop. Heck...if I had a prop that would fit your motor and you are in the twin cities area, I'd let you borrow to try...
Steve
Edited by VMS 10/28/2019 7:15 AM
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