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40inch mono v hull motor

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  • Jean77
    Junior Member
    • May 2012
    • 9

    #1

    40inch mono v hull motor

    Hey guys,im busy building a mono vhull and war wondering about a brushless motor that has enough power to make it go real fast.first choice was the turnigy 5692 but i just cant find one in south africa,so the guy at hk recommended the hk3674,1660kv,2-6s,1600w power.you guys think this motor will have enough power to swing a prop of maybe 63mm or more without getting to hot.im using a 180-200a esc.thanx
  • martin
    Fast Electric Addict!
    • Aug 2010
    • 2887

    #2
    That is bad advice from HK, the 3674 motor is way to small for a 40" mono + 6s on this motor in this size hull is also bad advice. & as for recomending a 63mm prop they clearly have no idea what their talking about.

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    • znus
      Broke, as usual
      • Jun 2011
      • 120

      #3
      LOL!! 63 mm prop on a 3674. Props that size is normally for 26cc gassers.

      I think you'll need a 4082 at the very minimum. A 1250 kv on 6s2p and a 45-47 mm prop would get you about 60-70 km/h.
      Or, if HK ever stocks up on their 5692 again, a 1320 kv on 6s2p and 47-50 mm prop would be nice too, and you'll probably be doing something close to 80 km/h.

      What speeds are you aiming for?
      25" Arrowana with Etti 2970 3300kV. RCMK Flying Cat with twin HOR Outboards. 2 x SSS 4092 2140kV. Faluga 45" with Leo 56110 620 kv on 12s.

      Comment

      • Jean77
        Junior Member
        • May 2012
        • 9

        #4
        Just to clarify,it wasnt advice from hk themselves but from the guy that own the hk franchise here.im looking for speeds above 60km/h.i just cant seem to find those big motors or im looking in the wrong places

        Comment

        • znus
          Broke, as usual
          • Jun 2011
          • 120

          #5
          Originally posted by Jean77
          Just to clarify,it wasnt advice from hk themselves but from the guy that own the hk franchise here.im looking for speeds above 60km/h.i just cant seem to find those big motors or im looking in the wrong places
          Well, if you're able to spend a few more bucks then OSE sells the Leopard 5692 1340kv and right now you'll get a free water jacket with it.

          http://www.offshoreelectrics.com/pro...o-5692&cat=148

          It's a big @ss motor! Make sure the rest of your drive line is up for the task.
          25" Arrowana with Etti 2970 3300kV. RCMK Flying Cat with twin HOR Outboards. 2 x SSS 4092 2140kV. Faluga 45" with Leo 56110 620 kv on 12s.

          Comment

          • Jean77
            Junior Member
            • May 2012
            • 9

            #6
            Ok thanx alot i appreciate the input.im really new to this so any help appreciated!next thing is the prop pitch on a 47 to 50mm prop?

            Comment

            • znus
              Broke, as usual
              • Jun 2011
              • 120

              #7
              Start with some plastic props...

              http://www.offshoreelectrics.com/pro...d=ose-3bld-316

              .....and try them out before spending $$ on metal props. They might not hold up for very long but they should atleast tell you if you're in the ballpark. And 47 mm - 50 mm is for a 5692, not a 4082. If your settling for a 4082 then get a 45 and a 47 of these

              http://www.offshoreelectrics.com/pro...d=ose-2bld-316
              25" Arrowana with Etti 2970 3300kV. RCMK Flying Cat with twin HOR Outboards. 2 x SSS 4092 2140kV. Faluga 45" with Leo 56110 620 kv on 12s.

              Comment

              • Jean77
                Junior Member
                • May 2012
                • 9

                #8
                Ok thanx i get what your saying.so the esc i mentioned woule be good for any of these motors?

                Comment

                • Make-a-Wake
                  FE Rules!
                  • Nov 2009
                  • 5557

                  #9
                  If you are going to be happy with 60km/h then you can run this 4074 from hobbyking on 4s with an x442 or an m445 and get around 70km/h out of it without straining the system, but a 4082 would be perfect, you can get those in Leopards, but the 4082 is out at Hobbyking.

                  Run it on 4s with a T180a ESC

                  http://www.hobbyking.com/hobbyking/s..._Inrunner.html

                  http://www.hobbyking.com/hobbyking/s..._Boat_ESC.html
                  NEED PARALLEL CONNECTORS?? QUALITY 5.5MM, 8MM, 8 AND 10 AWG, GET THEM HERE: http://forums.offshoreelectrics.com/...est!&highlight=

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                  • Jean77
                    Junior Member
                    • May 2012
                    • 9

                    #10
                    Ok so next thing,when mounting the motor what is the best way,shaft exiting the hull as straight as possible or should it be angled down a little?

                    Comment

                    • Make-a-Wake
                      FE Rules!
                      • Nov 2009
                      • 5557

                      #11
                      If its going to be a fixed shaft tube then i would angle it down just a bit, i have a few boats with fixed drivelines and they run well this way.
                      NEED PARALLEL CONNECTORS?? QUALITY 5.5MM, 8MM, 8 AND 10 AWG, GET THEM HERE: http://forums.offshoreelectrics.com/...est!&highlight=

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