Need help on trolling motor

[Cooter]

I just bought a new 16' bass boat and am looking for a new Minn Kota trolling motor. There are like 6 different shaft sizes to choose from between 42" to 72". The old one on the boat measures 42", but is that an normal size shaft for slow trolling? What do you guys have or suggest? Thanks guys!!

[Barnacle Bill]

See if this helps for the length: http://www.minnkotamotors.com/suppor...ral&lp=gb&pt=2

The length really has nothing to do with trolling capabilities as long as it gets in the water far enough. If you like to troll really slow like I do get one with variable speeds. ie, the power drive pedal.