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Boating Talk For discussion of everything related to boats and motors |
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Hey guys, need some help. My boat is a 17' mod v aluminum. I'm running a 70 Evinrude with a 6" jack plate no tilt/trim.
I have been through multiple props and here's my issue. If i trim it down it doesn't porpoise at all, but i lose speed. If i trim up i gain speed but porpoise, and it gets worse as i accelerate. If i trim motor down one notch i lose speed and bow is too low but no bounce. I've tried about 4 different props, just had a racing prop guy add some cup, adjust rake and shave tips on my 13 3/8 17 pitch stainless. I swear it gave me even more stern lift! I do have gas tank up front under decks but even when I'm only on a few gallons it handles the same. I came across some old posts about adding hook in the rear. Does this sound like it may help? I run 40 at about 57-5800rpms porpoising. I think I'll lose water pressure if i crank jack plate any more. I can attach pics if anybody needs to see what I'm working with. Sorry for the essay guys. Beating my head against the wall two years on this thing! ![]() ![]() ![]() Sent from my SAMSUNG-SM-G891A using Tapatalk |
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