I assume you have a Fusion catamaran
?? You may find posting
in the Multihulls section more profitable??
Over 20 years ago we were building the 35ft Banshee sailing catamaran
. An 8 berth performance cruiser with bridgedeck cabin
so probably something like a smaller Fusion in concept
One US customer fitted twin 90hp outboards. I motor
sailed it at 16 knots, and sailed it at 19. I have a photo
showing him towing a waterskier at 22 knots (with the rig up).
However the fuel consumption
was pretty horrible. At speeds over 10 knots you will need roughly another 10hp for every one knot
So how fast do you want to go?? Do you want to do 2mpg or 10?
I would say that 8 knots was a sensible maximum
Richard Woods of Woods Designs