will a controller from a eletric rc jeep work as a airboat controller?

as long as you have 2 channels, 1 for throttle, one for steering. And as long as the reciever can accept any servo (not a cheap radio set that has servo and throttle built in to the circuit board,though possible to use)

Try it out and see! I don't see why it wouldnt work.

I use a Traxxas truck setup off e-bay for $25.00, Tx and Rx.