My 2.5m Avon RIB is rated to 4hp, yet there seems to be 3m ish SIBs and RIBs that take 15hp 20hp even 30hp.
With a hard hull for the transom to attach to, I'd have envisaged i could put a Twatsoo 9.8 on the back. The 2hp 90's merc is about half it's weight i think....
I guess it's probably CE ratings or something - either down to how well the transom is attached to the hull or it could become ridiculously unstable at speed.....
