Just been doing some running tests in a bath half filled with water.
The amount of water shifted by the little 35 mm diameter two bladed propeller is incredible.
I could not run it at full throttle it would have thrown the water up over the end of the bath.
The starting torque is very impressive, very difficult to hold it still with one hand while operating the remote control.

I need to make the joint around the removable deck as waterproof as possible before it goes to the lake for trial runs.