Hi,
I've been following your thread for a while. I fully understand what your trying to do and why. You are trying to optimize your performance in hope to maximize your range.
Here's the problem I'm wrestling with. At 5 amps, the ME0913 has a torque constant of .75 Nm or .55 Ft Lb. If your spinning your prop at 200 RPM and it is a direct 1 to 1, if I understand correctly, at .55 Ft Lb, 200 RPM, you will be making about .021 HP.
I can see it moving water at 100 amp, because at 100 amp, we are now talking about 11 Ft Lb and spinning the motor at 1,000 RPM, you'll be making a little over 2 HP. If you overheated the motor, it clearly shows that you are overloading the motor with too large of a prop, almost twice the size it should be in my estimation if your quest is to avoid a gear reduction. If you are getting only 2 HP and your using a 48v system, it illustrates how inefficient that 1 to 1 ratio and 14" prop set up is making that motor.
That motor's sweet spot at 48v is around 2,500 RPM. It is rated to run at 125 amps all day long without breaking a sweat. If your headstrong on using the 14" prop, it's 2.5 to 1 reduction for 2 blade, 2.75 to 1 for 3 blade and 3 to 1 for 4.
Have you taken the boat out of the slip at 200 RPM? Is it your intention to maintain a 200 RPM prop speed?
Maybe I just have everything wrong about what your doing. I've been wrong before.
Scott
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Posted by: smasterson2@gmail.com
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