Selecting the Correct Shaft Length

For assistance in selecting the best trolling motor for you, click on the Trolling Motor Selection Guide below.


Selecting the Correct Shaft Length

Choosing the correct shaft length for your trolling motor is important so that the angler's electric motor does not cavitate, creating fish-spooking noise. The rule of thumb is to have the top of the lower unit or foot of the motor covered by at least 12" of water. In general, shaft length selection is more critical with bow-mount motors versus transom-mount motors. Most boat transoms are similar in their distance to the water, and Minn Kota’s standard transom shaft lengths should be adequate. With bow-mounted motors, there is much greater variation in shaft length requirements.


Measuring for your Correct Shaft Length

Measure from the mounting surface of the transom or bow where the motor will be mounted to the top of the water and add 20" to get the recommended minimum shaft length. If you will be fishing in rough water, add an additional 5" to the measurement. If you will be steering a hand-controlled motor while standing, add an additional 12" to the measurement. Use this measurement or the tables below to find the appropriate trolling motor shaft length. For more information, visit our Trolling Motor Selection & Boat Size Guide and Rigging Guides pages.






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