Re: How many hp do i need to wakeboard tube or ski?
My second boat was a 14' aluminum with a 35hp Johnny on it. I tried getting skiers up and it was impossible. The boat was too light, too small, and not enough power to compensate. Towing a tuber was no problem, however I did notice that on turns, and when turning, the tube/r would begin dictating the turn, essentially taking over and therefore keeping the boat in the middle of a turn while the tube/r takes control of the turn.
With your boat being fiberglass, I don't see skiing happening, but you never know. The hardest thing is getting that person out of the water. If you've got a solid holeshot and flat, calm water, you may pull it off.
Good luck and be safe!
SSS