30 HP on each side should be plenty. I recommend that you be careful about letting your mind wander to wanting to change out engines for a larger set. Engine
changes are a nightmare, with mounts, exhaust
, hoses, cables
, wires, and though hulls in the wrong places, if of course the new engine
even fits in the space allowed. Prove to yourself that the existing engines can't do the job first.
Fountaine says your boat
under engine power
at 5 knots and peaks at seven. Hull speed
is a bit tricky for a catamaran
, but those are good numbers for you if true.