Kirk,
You are missing the fundamental point, that is the controller puts out X power and that is all that is available to drive the boat, regardless of the motor it is connected to. A larger prop on any motor will pull more power, make your boat go faster and maybe ruin the controller.
The controller, motor and propeller all must be balanced to work together.
The voltage and motor type determine the RPM, the prop and boat resistance determine the load at that RPM (amps). The controller varies the voltage to the motor and therefore RPM.
If I were you I would experiment with different props, all the while carefully monitoring the amps the motor is drawing. Do this with the boat running free, not tied to the dock.
Your first check should be with the stock prop, the boat tied to the dock and controller at wide open. That is the amp limit you should not exceed with your experimental props and boat running free.
Model airplane props are cheap and can be easily modified to work on a trolling motor.
You will also find making a fairing for the round motor shaft will help more than you could imagine.
Details of my walk down this path here:
Start with post #212
Denny Wolfe
----- Original Message -----From: gentlemancaller2009Sent: Friday, October 08, 2010 8:13 PMSubject: [Electric Boats] Controller questionShouldn't the controller from a 36 volt Minn Kota Riptide 101# trolling motor be able to safely supply up to 75% power to a 48-volt Etek-type motor?
I'd like the groups opinions before I try it.
Thanks,
Kirk
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