@jrzspace adding on to what @Chtite451SR2 said, you might want two that spin in opposite directions to counter the torque of the first one. Try putting them on opposite side is the boat instead of right behind each other for max efficiency.

@jrzspace you need to angle the wings, and the speed of the motor and size of the propellers both count to make it go faster or slower
I believe you also need wing physics on too

@Chtite451SR2 I've done it but still. Is it the angle of the wing or the diameter or the speed of the motor? In the settings, the only thing that toggled on is Water physics.

Put wings (not structural panels) on an electric motor, put a fuel tank/strut between them
I can show a photo if you don’t understand

I have the same exact problem with a submarine. I have no idea, either. :l