trolling motor size ?

jerkoz

Petty Officer 2nd Class
Joined
Jul 21, 2010
Messages
172
have a 16 ft. aluminum starcraft supersport and was going to install a bow mount elec. trolling motor. not sure of the thrust lbs. or lenght of the shaft. can anyone with this size boat and has a bow mount motor help me out ?
 

KJINTF

Seaman Apprentice
Joined
Sep 22, 2012
Messages
32
Re: trolling motor size ?

HI

I asked a similiar question here as well - not too many responses
I did research on several other sites and received lots of great info
Aked several places for a spread sheet or similiar chart that would help us make a good decision never was able to find anything similiar
For me I decided on 80lb thrust for a 17ft metal boat that weighs in at about 1,400lbs without people and equipment
Went with the Minn Kota Terrova 80 w/ iPilot option
 
Joined
Feb 17, 2012
Messages
2,906
Re: trolling motor size ?

16' tinny would be ok with a 55lb 12v model if you run semi-clean water. if you plan to run a weed wacker in the grass and lillypads then 24v is a better option as the extra prop speed seems to keep the prop clean better than the 12v from experiance. i run a 70lb 12/24v on a fiberglass 16.2 fully loaded and it works well in river currents and in shallow weeds. if i had to buy again then i would proberly stay around 70-80lb. remember you can turn a trolling motor down but once max you can not turn it up so theres no problem with to big in the 12/24v range.
 

bassman284

Commander
Joined
Jun 24, 2006
Messages
2,840
Re: trolling motor size ?

HI

I asked a similiar question here as well - not too many responses
I did research on several other sites and received lots of great info
Aked several places for a spread sheet or similiar chart that would help us make a good decision never was able to find anything similiar
For me I decided on 80lb thrust for a 17ft metal boat that weighs in at about 1,400lbs without people and equipment
Went with the Minn Kota Terrova 80 w/ iPilot option

Sorry the responses were low. By the time I checked your thread, you had already decided. Besides, Silvertip is the most knowledgeable guy on the Electrical/trolling Motor forum and I usually find that once he has weighed in, I have very little to add, and his responses looked pretty much on the mark, as far as I could tell.

THAT SAID:

As to our friend jerkoz's question, it depends.

I have a 16'10" Lund that weighs in about 1400 lbs before I put my fat butt on it, so add 230 to the tally. I have a 55lb MinnKota Powerdrive V2 that does a a pretty satisfactory job. I generally use it to cruise the shoreline looking for largemouth although I also fish crappie and walleye, mostly trying to hold position. I-Pilot would be pretty cool there, but it will cost you a few hundred bucks more. I got Co-Pilot on mine, but I really don't think it was worthwhile. Knowing what I know now, I would have either skipped it altogether, or gone for the I-Pilot (which wasn't available then so I not really in the discussion.). I do use it now and then, but not really enough to justify the extra cost. YMMV.

Since 55 lb is the highest thrust available in a 12 volt system, the question really becomes, do you have space for two 12 volt batteries and do you want to maintain two 12v batteries? There have been a lot of threads here about trolling motor size and they mostly come down to this - too much power is better than not enough. You can always turn the oversize motor down a little bit, but you can't turn up the undersize beyond what it has. Again, it depends on how you intend to use it. My 55 lb spends most of its time set on 6 or 7 on the 10 scale of the speed control. Sometimes 8 if it's really windy. On the other hand, if I wanted to use it to travel any distance, 10 is not really adequate.

Relative to KJINTF's thread, I would have said that 80 lb was overkill for his boat, but I bet it will be fun. Again, too much power can be turned down. Make sure everybody is sitting down before you hit the go pedal at full power.

OK, I'm rambling a little bit, but I looked back on some other threads on trolling motor size questions and found one from a guy who had a relatively small boat, but his local lakes were electric only. Good case for getting the biggest you can afford.

As I said at the beginning, it depends.
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: trolling motor size ?

You determine shaft length by splashing the boat. Measure from the bow to the water and add one foot.
16 foot aluminum boats do nicely with anything from 45 to 55# (50 - 55 is my preference) but all of that depends on the water conditions, weather conditions, what you troll for, how you use the troller etc. If you constantly fish in windy conditions or you need to hold the boat (position fish) you should have the 55. If you consistently fish in sheltered water then a 45 would work but no less than that.
 

KJINTF

Seaman Apprentice
Joined
Sep 22, 2012
Messages
32
Re: trolling motor size ?

bassman

Thanks for the detailed response - Hope this helps others make a decision

Yes, I agree 80lb thrust is a bit overkill for the 17' 2" G3 V172FS boat w/90hp that weighs in at 1,440lbs plus as you 225lbs of my fat butt, 200lbs of a friends, 30 gallons of gasoline another 220lbs plus my beer and gear another 100lbs for a total of 2,185lbs. The tech folks at Minn Kota said they recommend 2lbs of thrust for every 100lbs of weight in the boat. Using their formula 45lbs of thrust would do the job. Checking their "Select a Motor" application, my bow to water line is 26" they recommend 48" to 52" shaft. Not wanting the Powerdrive Unit because the iPilot and foot pedal are not compatible went with a 54" shaft on the Terrova motor. Never had a GPS controlled motor and am looking forward to playing with it, should be a nice toy.

Maintaining two 12Vdc batteries not an issue- I have three and assume most folks have at least two with the engine battery and the trolling battery. I look at it as just another set of batteries that do need some maintenance along with the 5 in the RV, etc.. My winter project is to install a Sterling Power BtoB charger 12V to 24V multistage proper battery charging system in the boat. The Yamaha F90 is rated at 20amp charge current so I expect I can get at least 10 to 15amps from the engine while cruising the water, should allow me several days on the water with charged batteries. My electrical system can easily power any standard 12Vdc devices and I have the ability to power my higher thrust 24Vdc trolling motor.
 

jerkoz

Petty Officer 2nd Class
Joined
Jul 21, 2010
Messages
172
Re: trolling motor size ?

thanks to everyone on the motor size. got the 55 thrust and 52 inch shaft and it works fine.(16ft.alum. ss starcraft). jerkoz
 
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