Trolling-motors are specified in terms of the thrust output capability. It is the thrust and not the output of the electric motor in kW or HP that determines effectiveness. Thrust is a static measurement of force. It is a result of the power developed by the electric motor, the propeller shape, pitch and dimensions, and the speed in rev/min. The propellers are designed to achieve maximum acceleration for immediate response. Although frequently quoted there is no precise correlation between thrust and horsepower. The figure of 15 lbs of thrust does not equal one horsepower so use caution when using the numbers. Check out these sources for more on
trolling motors 
Freshwater
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