RE: Electric powered airboats?
I have run car motors and esc's in my sport and race boats with no problems in two years.
Most also use Hitec ms-81G servos for rudder. A very reliable servo for me, even with the force of water against the rudder blade. Others also use them in their competition boats.
My set-ups include 4 cell- mod motor, 6 cell- stock motor, 6 cell-mod motor, 8 cell mod motor.
Granted, inboards have run durations of about 3-3 1/2 minutes using 3000/3300 cells, but my mod motor set-ups run anywhere from 30-50 amps at load.
All my hulls are plastic, and haven't melted any yet.