Ive looked at a lot of electric powered systems from hobby grade, to retrofitting an ole CBR track bike( its feasible in that respect but only for a drag race not 15 mins on a track!), to one of those three wheeled full electric cars. But for a boat? Not feasible in my opinion. Think of the power output needed on those giant cats they run in europe, now by giant Im talking 70" there Lipos are longer than my whole arm an are in the ranges of 4-5k a piece! Youd need all you available weight on whatever fullsized hull you have just to carry enough power for a few minutes of run time. If you were to put a Gas powered motor to generate that power for a electric motor then its redundant. Just buy more cubes for your boat. Youll be hapier.

-Wayne