Has anybody any experience comparing Doel Fins and large trim tabs like Lifters (from Maxi-Marine)? I've now got my little 2.9m Ribtec tender and 15hp two-stroke outboard and am very impressed with its performance, but it does seem to be all or nothing. To get on the plane you've got to open the throttle almost wide open, then it accelerates like mad and goes very well. Two up it will plane, three up it really struggles, as the bow rise is massive and its pushing a huge wave of water.
I have the rib on an inland waterway where there's a speed limit of 10kts
but going flat out draws attention to yourself and is likely to get you fined. I'd like to be able to plane below this speed if at all possible on a reduced throttle, and think that either hydrofoils or the lifters are the way forward, especially as they should help improve load carrying ability.
I'd be happy with either solution, think i'd prefer the fins as you don't have to mess around removing them for the wheels to go down, but if the lifters would perform better then I'd fit those.
I'd really like to try both out, but don't fancy drilling holes in the cavitation plate and the transom, only to have to fix one set of them later!!
Any thoughts please??