Myles - Thanks for the info. The combination of the human-powered examples along with the information on JavaProp convinced me to buy a RC plane pusher propeller as the first retrofit. The human-powered examples concerned me a little bit given that the RPM is typically much lower (~360 RPM), and the airfoil shape on the blades could cause cavitation. I suspect that the trolling motor RPM will still be below the cavitation speed given how much the pitch decays on the outer diameter of the blades.
Matthew - Unfortunately, you are probably correct. A much lesser problem, I also suspect that the direction of the threads on the motor shaft are optimized for the forward direction.
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