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Author Topic: Shaft length and volts  (Read 704 times)

January 10, 2015, 09:35:06 AM
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Aquamaniac

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Shaft length and volts
« on: January 10, 2015, 09:35:06 AM »
I have reviewed a number of threads on TM's.....basically now that my old 200 Striper is becoming seaworthy my intent is to add one.
Especially after I caught Daniel123's reply showing a bow rail mod.
Had intended to try to keep it to 12V for a couple of reasons.....1) budget 2) issues about multiple battery placement.
From what I gather, 60" shaft is recommended for the 19-6 or 200......but it seems that is only available in 24 or 36V.
So.....
Would 52" shaft (available in 12V) work?
Would 55# (looks like the max in 12V) be enough, even though not ideal, to handle the 200 Striper? I know, I know.....you can never have enough power....but boat budget limits me to 'need', rather than 'want'.

Thanks in advance for any advice/experience you might offer.

January 10, 2015, 10:32:16 AM
Reply #1

GoneFission

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Re: Shaft length and volts
« Reply #1 on: January 10, 2015, 10:32:16 AM »
Yes, 60" shaft is what you want - but you can re-shaft a 54 or even 48 with a 60 shaft and wiring - not a big deal.  Obviously, starting with a 60" would be easier - but you are right - 60" usually only is available in 24 and 36 volt motors.  The manufacturers recognize that a 60" shaft is likely going on a bigger boat and most of those folks are going to need more than a 12 volt motor. 

Regarding 12 vs. 24 volts - do you have 2 batteries on the boat now?  A 12 volt trolling motor may not be enough for a 20 foot boat, and remember a 12 volt TM running on a single battery draws twice the amps compared to a 24 V pulling the same thrust.  If you already have 2 batts, it's easy to put them in series to power a 24 volt motor - the starting battery remains connected for 12 volts, and the other (should be deep cycle) is connected to the starting battery in series to get 24 V for the TM.  That's what I have done on my CCP and I run the TM a lot when fishing.  My 24 volt MinnKota struggles on a windy day, but it is adequate to move the boat 90% of the time.  Regardless of the TM, it's just a PITA to fish when it's really windy. 

Remember you will need a 50 amp breaker and at #6 wire to run to the bow to power your TM.  I also recommend a quick disconnect mount so you can remove the TM if you want without tools and leaving ugly holes in the deck.  Both MinnKota and MotorGuide offer quick-release mounts.  If you are looking around for a used motor on eBay or Craigs - look for one with a quick release mount and you might save some $$$. 

Hope this helps - good luck!
Cap'n John
1980 22-2 CCP
Mercury 200 Optimax 
ASPA0345M80I
"Gone Fission"
ClassicAquasport Member #209


January 10, 2015, 11:49:46 AM
Reply #2

RickK

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Re: Shaft length and volts
« Reply #2 on: January 10, 2015, 11:49:46 AM »
To piggy back onto GFs post - my 12V 50lb thrust trolling motor struggled in wind on my 170 - could barely make headway.  So I'm going 24v this time.
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

January 10, 2015, 11:00:35 PM
Reply #3

Aquamaniac

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Re: Shaft length and volts
« Reply #3 on: January 10, 2015, 11:00:35 PM »
Thanks for the reply guys.....great info to know.
I have a starting battery and a deep cell battery on board now. Set up as batt#1 and batt#2 (or ALL) through a Perko switch.
Both in the console.
Guess I will need to think this through. I have seen several folks doing rebuilds add battery space up front, using multiple batteries.
Did not want to go that route if possible. Although I doubt a third will fit in the console.
To be honest, not quite sure how to keep my present config ....yet add another deep cell up front somehow intermittently in series with batt#2 when TM needed.
Might be more trouble and expense than makes sense. Might have to just toss an anchor and fish (?)  :smiley_confused1:

While I try to sort all this out, I will be keeping my eye out for a good used 24V 60" Riptide.
Appreciate the help!

January 27, 2015, 11:47:22 AM
Reply #4

Aquamaniac

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Re: Shaft length and volts
« Reply #4 on: January 27, 2015, 11:47:22 AM »
Found a 52" shaft TM.....am I correct in thinking only the shaft and leads need to be changed to make it 60"?
Found a parts schematic here...http://www.fish307.com/pdf/MinnKota/Schematics/2009/Riptide80ST.pdf
Or does more need to be swapped out?
Anyone actually done this?
Thanks.

 

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