Motor question

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  • speedsport
    Member
    • Mar 2010
    • 49

    #1

    Motor question

    Would any one have a idea what kind of amps a 8900Kv motor would pull?
  • Flying Scotsman
    Fast Electric Adict!
    • Jun 2007
    • 5190

    #2
    Originally posted by speedsport
    Would any one have a idea what kind of amps a 8900Kv motor would pull?
    Sorry, you will not like this answer. That is a dumb question...8900Kv ?????

    Douggie

    Comment

    • mappo
      Senior Member
      • Feb 2010
      • 488

      #3
      8900kv

      OK Mr Scotsman, Be nice! maybe this guy is a newbie
      Do you know what the biggest problem with the world is?
      That the Smartest people are full of doubts while the stupid ones are full of confidence.::tt2

      Comment

      • Jeepers
        Fast Electric Addict!
        • May 2007
        • 1973

        #4
        Originally posted by Flying Scotsman
        Sorry, you will not like this answer. That is a dumb question...8900Kv ?????

        Douggie
        Why is that a DUMB question Castle makes a CM36 9000kv motor for 1/10 scale on road cars......................

        speedsport a little more info would be helpful like, what do you planing on putting it in? 8900kv is way to high for boat use unless you are running a very small boat on one 3.7v lipo

        Comment

        • Flying Scotsman
          Fast Electric Adict!
          • Jun 2007
          • 5190

          #5
          Answer..no boat...no prop...no battery and 8900Kv.

          That is why I responded that way. Newbies do some research first and most of you do.

          Douggie

          Comment

          • Jeff Wohlt
            Fast Electric Addict!
            • Jan 2008
            • 2716

            #6
            The only way is using a gearbox for that. That is the difference in boats and cars.

            We used to run lots of gear boxes with big props. 8900KV is pretty extreme but certainly could be geared right for smaller rigs.
            www.rcraceboat.com

            [email protected]

            Comment

            • speedsport
              Member
              • Mar 2010
              • 49

              #7
              I am new to brushless and new to electric boating. Ive only had nitros in the past.

              Where would I find gear boxes for some thing like this? The motor is quite small in physical size. I'm into the mini and micro boats.

              Comment

              • m4a1usr
                Fast Electric Addict
                • Nov 2009
                • 2038

                #8
                Originally posted by speedsport
                Where would I find gear boxes for some thing like this? The motor is quite small in physical size. I'm into the mini and micro boats.
                The only 2 gearbox setups I know of are the FDM tranny and the Hughey gearbox. Both are pretty big so they probably are not suited to small hull. I bet the heli and airplane community have something. Why not just get a small 380 or so motor and not spend money on a tranny? Small B/L motors are very cheap, much less then a tranny I bet.

                John
                Change is the one Constant

                Comment

                • speedsport
                  Member
                  • Mar 2010
                  • 49

                  #9
                  Ok I have this hull http://www.bbyracing.com/elecmicrohulls.asp its The Micro Patriot. I have a 30A esc laying around and 1/8 flex shaft etc. What would be a good size motor and prop for this hull? I have a extra X427 prop but I think it will be to big. Also I would prob run it on a 7.4 lipo pack.

                  All though I see they use a X431 prop so it may work.


                  Thanks

                  Comment

                  • Jeepers
                    Fast Electric Addict!
                    • May 2007
                    • 1973

                    #10
                    Originally posted by Flying Scotsman
                    Answer..no boat...no prop...no battery and 8900Kv.

                    That is why I responded that way. Newbies do some research first and most of you do.

                    Douggie
                    I know Douggie, it wasn't a dumb question, just a question with out a whole lot of info!!!!!

                    Comment

                    • video200
                      Senior Member
                      • Feb 2008
                      • 837

                      #11
                      Originally posted by speedsport
                      Ok I have this hull http://www.bbyracing.com/elecmicrohulls.asp its The Micro Patriot. I have a 30A esc laying around and 1/8 flex shaft etc. What would be a good size motor and prop for this hull? I have a extra X427 prop but I think it will be to big. Also I would prob run it on a 7.4 lipo pack.

                      All though I see they use a X431 prop so it may work.


                      Thanks
                      on the page you refeered to they reccomend a 480 size motor and a X431 prop (in the artr)
                      klaus

                      Comment

                      • Jeff Wohlt
                        Fast Electric Addict!
                        • Jan 2008
                        • 2716

                        #12
                        Steve has some Short and long motors here. He is waiting on some 380Xls that would be a great match.
                        www.rcraceboat.com

                        [email protected]

                        Comment

                        • Rex R
                          Senior Member
                          • Apr 2007
                          • 992

                          #13
                          methinks that if I were to go the brushless route, that one of these http://www.offshoreelectrics.com/pro...-380-L&cat=116 in either 7 or 8 turn flavours would work pretty well.
                          Still waiting for my boat to come in.it came in

                          Comment

                          • Alexgar
                            Fast Electric Addict!
                            • Aug 2009
                            • 3534

                            #14
                            eflite 2700 kv 28mm x 47mm is what i use in my mini vee on 3s

                            Comment

                            • Alexgar
                              Fast Electric Addict!
                              • Aug 2009
                              • 3534

                              #15
                              I also use a stock mini vee prop which is close to a x431 as far as i can tell
                              my link

                              Comment

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