I'm fairly certain you have the wrong prop. Porpoising indicates that your prop is providing too much bow lift when you really need stern lift. Is it a hull designed for mud motors? If so they're designed to run flat. When you slap an outboard on the back with prop that wants to lift the front end of the boat it just throws everything off.
Without knowing more about the hull design I can't tell ya for sure what prop you need, but it sure sounds like it's not the one you got.
With a F70 the prop will be for a 4.25" gear case. It's likely gonna take some experimentation to find the one that works. Dan's Discount Props used to be an ideal option for procuring one because if it didn't work you send it back and exchange for another, at a small fee. But it's easier than taking a big loss of a new prop that didn't work.
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Last edited by willyworm; 04-24-2024 at 02:32 PM.
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Delta in a nutshell: Breeding grounds + small wetlands + big blocks of grass cover + predator removal + nesting structures + enough money to do the job= plenty of ducks to keep everyone smiling!
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