i just purchased a 2001 key west 1720 sportsman with a 90hp johnson. planning on fishing fresh and saltwater. looking at minn kota riptide. 40lb of thrust. know the equation on how to find out that. worried about length mainly. any suggestions?
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Assuming that you are going to mount it on the bow,all you need to insure is that the motor head is fully submerged and when you rotate the head it clears the the hull.
Good luck and happy boating