The cheaper Minnkotas do use a 5 speed forward, 3 speed reverse control which is wired through resisters mounted in the front of the motor. The more expensive ones use a pulse width modulation board with variable speeds. PWM switches the full 12 volts on an off rapidly. The more rapid, the faster you go.
At slow speed, PWM, is more efficient, but for us guys, full speed is where we’re at . . . most of the time. At full speed, the cheaper motor actually pulls less current than the more expensive one.
All Minnkota trolling motors have a 4” pitch prop. No matter how big a motor, or even multiple motors on one boat, top speed is around 3 miles per hour. I can’t imagine going anywhere at a lower speed.
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