After searching everywhere possible, I couldnt find the inner propshaft for this boat, so I ordered another one, they only had longer ones so it was cut down a bit.
My homemade shaft coupling requires a strip of 11mm wide insulation tape to be wound onto the propshaft to take it to the right diameter. The motor and gearbox are from a Wltoys v262 quadcopter. I wanted to try this setup first, just as a matter of interest. They drive 8 inch props on the quadcopters, my Rorqual prop is 30mm, shouldnt strain it, I hope.
Radio and motor are hotglued in place, in case the motor doesnt cope and I have to swap it for something else. Hotglue is far stronger than required but the components can be eased off if required.
Radio gear is 9g steering servo, 20a brushed esc, 27mhz 2ch radio, (vintage) . Lol
Bath tests indicate it should go fairly fast, takes off from a standing start pretty quick. Doesnt sit very low in the water, so still quite light. Finally finished, apart from maybe some paint, but I quite like the all yellow scheme.
I might add a couple of little magnets to hold the lid (or superstructure) on.
No idea when I will get to test it in open water, just been snowing here so not looking promising.