Calculations only go so far. Even when you buy a prop from a major prop manufacturer and install it on a a production boat with with a known motor, its still trial and error. If its a plastic prop, you can heat it up and change the pitch by hand. You will lose performance, since each blade will be slightly different, but if your amp draw and/or speed are better than stock you are ahead of the game.
I converted a Honda 2.3 to 3 KW (pics on my instagram). With batteries, it cost around $1100. Cheaper than anything comparable,and totally doable but its not for the faint of heart.
Matt Foley 
Sunlight Conversions
Perpetual Energy, LLC
201-914-0466
On Friday, January 24, 2020, 08:35:59 PM EST, Keith M <penobscot17@comcast.net> wrote:
SW - I will post the results, but probably not until Spring when the water warms up...
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.
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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