It won't be much of a speed demon and probably not good for any more then tubing. It "might" not even plane out properly. The rule of thumb is to keep at least 70-75% of the maximum HP on the transom so the boat will perform properly. Starcraft has not manufactured a small tri-hull in years and the older ones (Circa late 1970's) were rated at 85 HP so a 30 hp would not be strong enough. I would see you getting dissatisfied early on.