The standard shaft length is 42". To determine the right length for your boat, measure the distance from where the shaft is mounted on the deck or the transom to the water. Then add 16" (for MotorGuide) or 20" (for Minn Kota) and select the next closest measurement.
Likewise, can you adjust the shaft length on a trolling motor?
If the shaft ends up being a bit too long, you can always adjust the shaft depth upward with the depth collar adjustment found on nearly all trolling motors. But if you pick a shaft that's too short, you're simply out of luck.
Additionally, how fast will a 55 lb thrust trolling motor go? In fact two 55 pound thrust motors will not move you any faster than one 30 pound thrust motor. Higher thrust 12V trolling motors are designed for bigger heavier boats with larger payloads. The maximum speed of a trolling motor is 5 mph regardless of how many pounds of thrust.
Thereof, what size trolling motor do I need for my boat?
Trolling Motor Thrust Guide
|Boat Weight (lbs)
How many pounds of thrust does a 2.5 hp outboard motor have?