5th scale gas RC air boat

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Pretty easy to make really, my great uncle had one. Make dam sure you build a cage around the prop. Just need a prop mount for a large scale airplane. A hunk of wood or whatever else you want to use that floats. Can make the air director out of about anything, reciever, gas tank 2 servos and you got an air boat.
 
I would mount the engine to the boat itself and use a belt to drive the prop. Otherwise, it's going to be very top heavy!
All depends on how wide and long you make the boat . If he does it to scale it would be fine. I'm guessing about 14" wide by 30" long. Need about a 8 to 10 inch prop maybe. Just a lot of guessing hear. I honestly don't know. I would think it's already been done before so just start googling for plans.

quick search and I came up with these video .

 
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