Nuke Power wrote:My only concern is the motor. I may need a big one for the 3 1/4" prop on this thing.
For my OTW Vanguard, which is the same scale(ish) I have a motor made by Premotec. It's 24 volt and spins at 2500RPM free running and about 1700 RPM under load, under load (prop in a bucket) power used is about 35 watts, which is half the stall wattage of this motor. Does it's work pretty easily.
It's a large diameter armature, so it runs direct drive. I guess you will want to run 12 volts, as 24 volts can be a bit of a problem when sourcing ESC's. Car breakers will unearth some nice large motors for such a boat. Look at car heater blower motors.