Re: [electricboats] Max props have arrived

Let do some math.

2500 Max RPM divided by 3.21 = 778.8 RPM at the Prop

8 knots is approx = 9 MPH

9 MPH = 47,520 feet per hour

47,520 feet per hour = 792 ft per minute

792 ft per minute = 778.8 rotations per minute = 1.02 ft per rotation

1.02 ft per rotation is approx = 12 inches per rotation 

12 inches per rotation gives you the minimum pitch assuming that all the rotation of the prop resulted in forward motion of the boat.

Looking at the Easy Prop Table, 24 deg, 11.8" is the most they recommend.

You could go past the recommended to 30 deg, but that is a lot of pitch and at that pitch you may exceed the torque rating of the motor.

 

Can you change the reduction gears?

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