r ward

I am going to build an outrigger hydro airboat with a 4 ft. long tub and 22 inch sponsons. I have a Supertiger .40 and a Supertiger .61 to use which would you put on it ?. please don't comment if you are going to say the .61 just to put the biggest engine I have on it.....bigger isn't always better.

controlliner

That size hull would use a .60 to a .90 engine with a tuned pipe to stay on plane.