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What size motor for 12 ft V-hull Aluminum boat?

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  • What size motor for 12 ft V-hull Aluminum boat?

    I have a 12 ft Simple Aluminum slight V-Hull boat, and want to use this boat to run up river, this river can get quite a current when water is running. So what size engine would have enough power to get up a fast current? I was looking for a 9.9 hp, but I wonder if a 6 would be able to do the job?

    the boat is very light, maybe 200 lbs. And the beam is about 3-4 ft wide. closer to 4 ft wide.
    16 ft runabout w/ 70 hp evinrude
    26 ft grampain sailboat


  • #2
    Re: What size motor for 12 ft V-hull Aluminum boat?

    Not knowing the size of the river and what the current is, I can't say for sure, but most 12' boats do fine with a 6-or-so.

    But if your boat is rated for it, I would go with the 9.9. A small aluminum will really scoot with a 9.9, and save you a lot of fishing time
    Clean feet are happy feet; same for boats.
    1964 MFG Niagara Deluxe
    sigpic

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    • #3
      Re: What size motor for 12 ft V-hull Aluminum boat?

      This is the Susquehanna river, at the Head of the Chesapeake bay. It is about a mile wide, But there is a dam upriver, and when they release water, it may be a 5 MPH current, maybe more.

      I had a 2 50 lb thrust trolling motor's on there, and had both going and was just staying still in the current.
      16 ft runabout w/ 70 hp evinrude
      26 ft grampain sailboat

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      • #4
        Re: What size motor for 12 ft V-hull Aluminum boat?

        Here's a good thread...
        http://forums.iboats.com/showthread.php?t=297930
        '77 Crestliner Voyager Deluxe 16' (semi V), Spartan WondeRoll tilt trailer, '81 Johnson 25 hp, '88 Johnson 30 hp, '87 Evinrude 30 hp

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        • #5
          Re: What size motor for 12 ft V-hull Aluminum boat?

          9.9, definitely.

          For trolling motors you can guess at about 1hp for every 25- 35 "pounds of thrust."

          It's actually not that simple, and I think there is a thread somewhere about the math, but that is good enough for easy figuring.

          So a 6hp will just barely creep you over the speed of the current. It may not plane your boat well, either, but I have no reason to say that other than a guess. You will likely plane out about 10 to 15-ish mph with the 9.9, nice for getting somewhere and enough to insure a margin of safety.

          That is my opinion. Mileage may vary...
          Clean feet are happy feet; same for boats.
          1964 MFG Niagara Deluxe
          sigpic

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          • #6
            Re: What size motor for 12 ft V-hull Aluminum boat?

            Almost all v-hull 12' boats are rated for 10 hp, so I'd get the 9.9. It'll plane you out, and that's the key to going upriver. With the six, not so much. I use my 6hp on the Mississippi, though, up here in Minnesota. I avoid the river when there's a lot of current, since it's a drag running against it.

            Sure...go ahead and laugh at my old aluminum boat. It's paid for!

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            • #7
              Re: What size motor for 12 ft V-hull Aluminum boat?

              I saw an ad for a 7.5 HP honda engine. selling for $250 bucks.

              I think that would get the job done, But you never hear anything about honda engines, Idk if they are good or not.
              16 ft runabout w/ 70 hp evinrude
              26 ft grampain sailboat

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              • #8
                Re: What size motor for 12 ft V-hull Aluminum boat?

                least 9.9 i got a 10hp 2 stroke and with me and buddy about 135 and 110-115between the both fo us and some gear plug gas we plane out pretty good if he sat in the front. my boat was a flat though with a vi hull in front. would suggust leats 9.9

                forget the honda its 4 stroke
                -1964 20Ft Riviera Cruiser, 1961 14.5Ft Critchfield, 1962 15ft Orlando Clipper
                -1959/60 10 Hp Evinrude, 1961 Mercury 500, 1958 35 Hp Johnson (Sold), 1990 25 Hp Johnson (Sold), 1985 60 Hp Johnson

                1962 Orlando Clipper 15FT http://forums.iboats.com/showthread....hlight=orlando

                http://photobucket.com/sgdteam

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                • #9
                  Re: What size motor for 12 ft V-hull Aluminum boat?

                  yea, 4-strokes are way too complicated for that size of engine. And too much weight.
                  16 ft runabout w/ 70 hp evinrude
                  26 ft grampain sailboat

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                  • #10
                    Re: What size motor for 12 ft V-hull Aluminum boat?

                    Go with the max you can. Best for fighting currents and some reserve power. The difference in fuel is hardly noticeable.
                    sigpicMarada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!

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                    • #11
                      Re: What size motor for 12 ft V-hull Aluminum boat?

                      Had a 12' tinny with an old ('64) 9.9 on it and it did really well in my river, currents would get pretty heavy at times and I never had a problem.

                      With just me in th boat and the eight spread out just right it would really move out.

                      A 6 will do but a 9.9 would be better.
                      GO IRISH!!!!

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                      • #12
                        Re: What size motor for 12 ft V-hull Aluminum boat?

                        Originally posted by bowman316 View Post
                        I saw an ad for a 7.5 HP honda engine. selling for $250 bucks
                        I don't care for Honda's but that is not the point. Get a 9.9.
                        Clean feet are happy feet; same for boats.
                        1964 MFG Niagara Deluxe
                        sigpic

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                        • #13
                          Re: What size motor for 12 ft V-hull Aluminum boat?

                          I used to run a 12ft with a 6 hp, and always wished I had something like a 9.9 on it. If you find a killer deal on a 6 hp though you should be okay.

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                          • #14
                            Re: What size motor for 12 ft V-hull Aluminum boat?

                            9.9 is the way to go.
                            WE LOVE FUN STUFF!!!!!

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                            • #15
                              Re: What size motor for 12 ft V-hull Aluminum boat?

                              I have a 12' Duranautic V hull, it runs along ok with a 1978 6 hp Johnson on it but struggles in anything but the very least amount of current with two passengers. I'm close to 300lbs, and add a passenger and some tackle, and were pushing 600lbs, it moves the boat but not very fast. My 9.9 does a lot better but still isn't super fast. I actually do better with my older 9.5 hp Evinrude since its so much lighter and I don't need to carry the 75lb battery.
                              I have a Honda 10hp, it's an older Honda 100 4 stroke, it runs great but outweighs my Johnson 25 hp. I wouldn't even consider hanging it on my 12' boat. I believe their 7.5 hp motor is based on the same motor?

                              I'd go with no less than the 9.9 hp. The best thing I did to mine was to put the 15hp carb on my 9.9, that woke the motor up enough so it at least has enough power to get the boat well on plane and moving along at a nice pace.
                              My Duranautic is rated for 10hp max and 540lbs.

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