Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina
The trim of the outboard is one place to look, as mentioned above.. If by 'foil' you mean those fins they add to outboard cavitation plates, that might be worth investigating, but I'd be skeptical.
You may be powering on too hard (and likely not gaining any speed anyhow) so throttle back to reduce the 'squat' and see if things go better then. But also check the trim pin on the clamp bracket.. if the motor is tilted up aft, that will promote the 'squat' that's giving you problems. Try going to the lowest pin setting there.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)