The BB is a semi-displacement hydroplane hull which has a tendency to aerate the prop. The x450 prop worked because it is large enough to push enough water to get that draggy boat moving, and because it is designed to work in a partially areated environment. The other props are either too small or don?t work in a cavitating environment. Part of the problem is that his motor has an excessive rpm/volt rating, and matching a prop to his power setup could be a challenge - too small and it will cavitate badly and too large and it overheats the motor.
That motor is only rated to 10 amps, which with only 11 volts doesn?t develop enough power to turn a prop large enough to efficiently move the boat. Pulling more amps increases the power but overheats the motor. That motor is really designed for slow scale boats like fishing trawlers and steamers. A speedboat 42? long is too much load. The OP would be better off if he obtained a motor more suited to his needs.
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