engine height df140 on SF20

[TMala]

Thanks Strick. I will consider that. I read of some people that swear by those fins you bolt up to your cavitation plate.

I have the 14X20 suzuki SS prop, which seems to be the go to for this set up.

After looking at pictures of other seacrafts with 25in transoms I see engines mounted as far high as "prop shaft 5/8in above the keel" on ones built for high performance to boats with the engine mounted on the lowest holes.

I'm not looking for a speed boat, but trying to find the balance between ease of planing, lowest planing speed, and comfortable ride (eliminate porpoise). I may have to add a livewell or some seating in front of the console to try and shift more weight forward, but would like to tune boat best I can before adding weight which is probably unnecessary.

I read this comment by Fr Frank from here on another thread "You need to be careful about height when mounting behind a 20'. One problem can be excessive porpoising caused by thrust distance from the hull rocker point. If you increase height, you will possibly need to increase mounting angle as well. Stock transom angle on the 20' is 14 degrees, I believe. Consider wedges if necessary. There's a 20' SF near me with a Merc 250 on a B Bracket, he had to go to 17 degrees, and has trimming difficulties still below 35 mph."

This makes me believe from the get go my mounting was too high although other places I researched stated porpoise can be caused by mounting too low, so I don't even know what my next move will be haha!

Anyway, it's blowing 50 mph out of the west here today so no test runs anyway, just a whole lot of contemplating.