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Old 01-25-2010, 01:07 PM
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Default Trolling motor size for 3000+ lb boat/motor

Need to make a decision between an 80 pound and 100+ pound motor, at this point the difference in cost is not all that significant, basically an additional battery.

The Minn-Kota web site says that a 21 ft boat can be managed by an 80 lb motor but with tidal currents, I wonder if I should just go ahead and get the bigger one. I have an 80 lb motor on my current 17 ft boat and it is great but it is a much lighter boat and a much smaller engine

Any real life experience out there? The boat is 21 ft, dry weight 2500, plus 4-stroke engine, plus people, gas, etc.

Thanks
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Old 01-25-2010, 01:13 PM
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Go with the 36v 101 and you will be much happier than the 80lb. I would even have one on my boat if I had room for the extra battery.
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Old 01-25-2010, 01:15 PM
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I am thinking if I am not sure, go with more....
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Old 01-25-2010, 03:58 PM
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36v - no doubt....

Keep in mind that even with the need to add the extra battery, you will most likely get a longer run time using the 101 motor instead of the 80lb.

Reason is if you only need say 65-80lbs thust to get the job done on a particular day, then with the 80lb you are running flat out, but with the 36v you are not so the amp/hr draw should be less (extra battery and the higher voltage is why). The equation only gets better if you need less thrust. Plus since money difference is not significant, why not have the luxury of having the extra thrust "just in case". It might be "managed" with a 80 pound, but will it be managed well?

Just a FYI, I run a 24v 80lb maxxum on my 17' aluminum fresh water boat and a 36v 101lb rip tide on my 22' Skeeter ZX2200 bay boat (a little bit longer and a little bit heavier than your setup). I also have 6 batteries (3 for trolling motor, 1 dedicated cranking, and 2 for everything else). I would not even consider running a 80lb on the ZZ2200.
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Old 01-25-2010, 03:59 PM
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Cabelas has the following formula for estimating the thrust needed for trolling motors. I used this when selecting the trolling motor for my boat and if anything I probably needed a bit less than what the formula came out to. I think it estimated my needed thrust at 92 lbs. I bought up and went with the 101lb. Minkota 36 volt. In retrospect I might have stayed with the 80lb just to save the weight and cost of the extra battery.

Here is the formula they use:


The size and weight of your boat translates into your need for power (thrust) and endurance. The basic rule of thumb for determining the amount of thrust you need is five pounds of thrust for every 200 pounds of weight. Don't forget to include the weight of your boat's contents in the calculation. To be sure that you have enough power, take the boat's estimated weight and add in its maximum weight capacity. A boat that weighs 1,500 pounds, and has a maximum weight capacity of 1,200 pounds would need a motor with 67.5 pounds of thrust. (1,500 lbs. + 1,200 lbs. � 200 = 13.5 x 5= 67.5)



Cabela's has a pretty good "buyers guide" area for finding the right trolling motor
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Old 01-25-2010, 08:19 PM
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Quote:
Originally Posted by abaze2001 View Post

Cabela's has a pretty good "buyers guide" area for finding the right trolling motor
Cabela's also has some good deals on factory re-certified MinnKota units as well (with full warranties). The selection varies from month to month, but they have them on their website.
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Old 01-26-2010, 09:41 AM
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i fished for years in a 22 triton in LA...marsh, coastal type fishing. i had the 36v 101 riptide...if they would have made a bigger one, i would have bought it. you cant have too much. the 101 was great motor...we even used it around the oil rigs to hold the boat in place. DO NOT SKIMP on this... you will be sorry if you do.
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Old 01-26-2010, 10:35 AM
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you guys are great..... I ordered the 100 lb. Interestingly, I more or less had to fight the dealer who said, "we have never put that size trolling motor on a boat." Word to the wise, trust your instincts and make your own decision. Appreciate the help and replies.
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Old 01-26-2010, 03:10 PM
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dward51, where can you find the recertified Minn Kota otors on their website?
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