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Old 02-15-2008, 08:13 AM
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Default RE: motor size?

Nothing at all wrong with using that motor on an airboat.

What are you looking for in your boat? Classic handling with sliding turns, all out speed, precise control?

What kind of hull are you interested in building? Flat bottom, three pointer, tunnel, hydro, stepped?

What materials are you interested in using? Wood, foam, plastic, metal?

Lots of questions to answer your question.

I'd start with a foam or wood flat bottom. They are easy to build and a lot of fun to drive.

I use a loose formula to determine the size of a flat bottom hull. Based on the specs for the OS .75 AX, the largest prop you would run would be 15". Based on that I would make a hull 18" wide by 32"- 36" long by 2 1/2" deep.
Make the rake start about 1/3 of the length from the bow.
Shoot for a balance point about 1/3 of the length from the stern.

I'm sure others will chime in as well.

The most important thing is to be safe.
The second most important thing is to post pics and vids.