I've got a 35hp kawasaki ultralight airplane engine. It is beltdriven. How hard would it be for me to build a surface drive mudmotor with this thing? Is it just as simple as setting it on like a mudbuddy, godevil or gatortail frame?

it's just that forkin easy some of us are just lazy

If its a 2 stroke it won't work well cause it aint got the low end torque needed in the mud~ sorry

You could build a "Scooter"....

http://www.arrowprop.com/airboats.htm

Or a "Mini Ranger" 35 hp...

http://www.americanairboats.com/new_airboats.htm

With an airboat propeller - yes - right....

With a mudscrew - no - not gonna do it, nope noway...
unless you use a very small pitch like what a 6 hp might use.....
or a 3 to one reduction gear....
but that is silly.....

It's made for a blow job - use it that way....

I thank what he is tryin' to tell you is ..... TwoStroke applications are different than the FourStroke applications. Thats the way I be understandin' it anyway.

Two stroke makes way more horse power per cc. 4 stroke makes way more torque.
Torque is what gets you to your horsePOWER band of sorts. It takes torque to get something moving, horsepower keeps it moving

Kyle at Gator Tail had a Rotax on a GT frame. He said it hauled ass but was very loud.

So it will take me longer to get on plane, but when I do it will run like a scalded dog?