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Size mud motor for Grumman?

Discussion in 'MichiganWaterfowl.com' started by moose1, Sep 29, 2017.

  1. moose1

    moose1

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    i have Grumman sportboat that I use for shiawassee and also would like to hunt other small swamps with. I've used a 9.9 on it when in shi but that won't work for the small swamps by my as they are too shallow. What size mud motor should I look at? Would a 12hp be too big and heavy for that boat?
     
  2. TCcrawdad

    TCcrawdad

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    I don't have a mud motor for mine yet, but I think a 12 would be a little large due both the transom and the fact that the nose lifts right up with a little weight. I have been looking at motors that are like 5 or 6hp.
     

  3. scotts98rt

    scotts98rt

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    6hp pushed the sport boats I was in just fine with 2 guys and gear.
     
  4. Rbingham

    Rbingham

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    I run an 8 hp (301cc) predator long tail. I considered the 13 hp but it is 20+ lbs heavier. At 54 lbs for the 8hp motor after running the setup for a year I wouldn't go any heavier. The boat runs 12-13 mph while loaded for hunting but at that speed can be a little unpredictable when the Lewis winch is on the boat. I've also got a modded (212cc) twister mud motor that I bought but haven't ran as Ive been happy with the predator long tail. ImageUploadedByOhub Campfire1506780881.485326.jpg
     
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  5. moose1

    moose1

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    would you run a 5hp mud buddy on shi or would it take too long to get to the 30's and 40's? I was thinking about a backwater 6.5, mud buddy 5 hp or a ppf wood duck 7 hp briggs and stratton.
     
  6. smoke

    smoke

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    A crawfish model go devil might be just the ticket. I believe its a 9 hp and fairly light. Just have to watch the weight in the stern. Plus I wouldn't drive a longtail sitting down so you'll have to devise a grab bar of some sort. Light weight is the key for that boat.
     
  7. smoke

    smoke

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    Just looked up info on the go devil motors.
    6.5 hp 109# 58" shaft briggs motor approximate speed 10 mph
    9 hp 140# 72" shaft honda motor approximate speed 12 mph
     
  8. lastflight

    lastflight

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    Wow those are heavy!

    I have a 7hp Stumpjumper on a lightweight 14' flat bottom. I think the motor weighs 65 pounds. For the managed areas, it's plenty of motor.
     
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  9. smoke

    smoke

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    I'm used to big block surface drive motors so when I said fairly light, I was comparing these to surface drives which is def. not apples to apples. :lol: My fault, I thought 109# was fairly light in comparison, but 65# is very light. What kinds of speeds does it run? 7-10 mph?
     
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  10. smoke

    smoke

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    Just checked the weight of the 8 hp stump jumper and according to their specs it weights 85#. So the 6.5 go devil weights 24# more, but I believe its built a little heavier duty as well. But with a smaller boat 24# is a bunch of extra weight to carry in the rear.
     
  11. lastflight

    lastflight

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    I guess I have the 6.5hp, couldn't remember off the top of my head. Their listed weight is 62 pounds. Another option is the PPF Wood Duck. Same concept, weighs 59 pounds.

    With a light load I get around 13mph on my flat bottom. I also use this motor on my 4-Rivers style marsh skiff. Not as fast with a displacement hull but I was going through areas last week where there was NO water, just soupy mud.

    I believe the difference in weight is these motors use an aluminum frame, where Go-Devil uses an all steel frame. IMO the Al frame is more than enough for these low hp motors. These motors use the same steel driveshaft and threaded stainless prop. My buddy has the Thai longtail kit in 6.5 hp. It was very inexpensive but it is certainly not built as well, especially the lightweight Al prop.
     
    Last edited: Oct 9, 2017
  12. moose1

    moose1

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    I was looking at the ppf wood duck then doing the hop up kit to get it to 9 hp. They list different torque for each engine they have too. What's torque do for you with a mud motor? Help in the thick mud and crap I assume?
     
  13. SteelShot

    SteelShot

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    Copperhead makes a 9hp surface drive that weighs 90 lbs. Might be worth a look.


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  14. moose1

    moose1

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    It's also over twice the cost. Ppf is 1200$ delivered. The copperhead is 2800$ plus shipping.
     
  15. SteelShot

    SteelShot

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    Yeah but it’s a surface drive instead of a long tail. Copperhead says it will run 15mph and has electric start plus a generator to run lights.

    I get the price thing though. I had reserves when I bought my Gatortail gtr 35 last year due to cost but after having it for a summer I wouldn’t want another motor.


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