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#11311124 - 12/29/15 08:52 PM Trolling motor shaft length
HItec Redneck Offline
Angler

Registered: 05/28/08
Posts: 308
Loc: Houston, Tx
I am looking to replace my current tiller style trolling motor with a Minn Kota Maxxum 70 foot control. This motor is only made in 2 lengths, 42 and 52" The bow to waterline measurement on my boat is 15". According to their specifications you should add 5" to the length for rough water conditions which makes my total length 22". Their chart says from 16 to 22" the recommended length shaft is 42-45". My concern is the 42 may be too short and the 52" is going to be way to long.

I am trying to figure out if the 42" shaft will be fine or if I need to be looking at a different series motor that has a 45" shaft.

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#11311475 - 12/30/15 02:52 AM Re: Trolling motor shaft length [Re: HItec Redneck]
Bobby Milam Online   content
Extreme Angler

Registered: 07/13/14
Posts: 2989
Loc: Arlington
what length do you have now. no one can answer your question without knowing specifics about your boat. I almost bought the longer shaft for my boat but found the short one works regardless of how rough the water is.

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#11311638 - 12/30/15 08:24 AM Re: Trolling motor shaft length [Re: HItec Redneck]
Bob Landry Offline
Extreme Angler

Registered: 08/10/11
Posts: 2678
Loc: Austin, Tx
A lot is determined on what kind of water you'll fish in and how high the bow rises in rough water. The numbers MK uses to figure shaft length are good and the MSRP difference between the two lengths is only $30. If you are worried about it, get the longer shaft and try the motor in the conditions you fish in. A repair shop can always shorten it and you could even do it yourself. It's not that hard.
The only disadvantage to having the longer shaft is that it might possibly take up valuable deck space on the bow when not deployed. There is no other down side. I have the longer shaft on my Riptide and there have been a couple of times I was glad I had it.
_________________________
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115

Bitter Gun Owner
Bitter Clinger
Armed Infidel

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#11311665 - 12/30/15 08:36 AM Re: Trolling motor shaft length [Re: HItec Redneck]
Dayne Online   content
Extreme Angler

Registered: 12/16/06
Posts: 2997
My Champion came with a 42" tm shaft. I had a 45" put on before taking delivery. There have been several occasions when that wasn't enough.

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#11311786 - 12/30/15 09:39 AM Re: Trolling motor shaft length [Re: Bob Landry]
Kyle405 Offline
Outdoorsman

Registered: 06/26/15
Posts: 238
Loc: Mansfield, TX.
Originally Posted By: Bob Landry
A lot is determined on what kind of water you'll fish in and how high the bow rises in rough water. The numbers MK uses to figure shaft length are good and the MSRP difference between the two lengths is only $30. If you are worried about it, get the longer shaft and try the motor in the conditions you fish in. A repair shop can always shorten it and you could even do it yourself. It's not that hard.


The only disadvantage to having the longer shaft is that it might possibly take up valuable deck space on the bow when not deployed. There is no other down side. I have the longer shaft on my Riptide and there have been a couple of times I was glad I had it.


Well said.

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#11312655 - 12/30/15 05:39 PM Re: Trolling motor shaft length [Re: Kyle405]
HItec Redneck Offline
Angler

Registered: 05/28/08
Posts: 308
Loc: Houston, Tx
The current trolling motor that is on my boat has a 50" shaft (tiller style). I contacted a local Minn Kota dealer and he had me take some measurements off my current motor in the down position the 42" shaft motor will be long enough to go almost 16" below the water line. Right now the current motor is @ 14 inches below the water line and so far I have not had any issues with it in rough water.

Thanks for your inputs and suggestions. The new motor is on order and should be here by the end of next week.

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#11324647 - 01/05/16 01:22 PM Re: Trolling motor shaft length [Re: Bob Landry]
Jones Trolling Motor Online   content
Pro Angler

Registered: 05/01/11
Posts: 501
Loc: NE Texas/SW Arkansas
Originally Posted By: Bob Landry
A lot is determined on what kind of water you'll fish in and how high the bow rises in rough water. The numbers MK uses to figure shaft length are good and the MSRP difference between the two lengths is only $30. If you are worried about it, get the longer shaft and try the motor in the conditions you fish in. A repair shop can always shorten it and you could even do it yourself. It's not that hard.
The only disadvantage to having the longer shaft is that it might possibly take up valuable deck space on the bow when not deployed. There is no other down side. I have the longer shaft on my Riptide and there have been a couple of times I was glad I had it.

The shaft on a footcontrolled can be replaced, but not cut down. However, when you replace a 52 with the 42, the mount for the 52 is too long for the 42" shaft and will not allow the motor to ride in the correct position on the motor rest.
The 42/45" is the most common and considered "standard" for MinnKota trolling motors on most bassboats. Some, and depending on waters fished, set "bowhigh" and need the 52".
John
_________________________

www.jonestrollingmotor.com
texarkana, Ark/Tx

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