motor shafts ?

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • darryl whitman
    Senior Member
    • Sep 2012
    • 535
    #1

    motor shafts ?

    ok guys , I am looking at motors , an I see 5mm an 8mm shafts.
    what r the pro's an con's.
    I'm getting a ML gp400v2 hydro built by Mike L. an now looking to get
    my setup for it. I'm thinking of a 1500kv motor.with this size of boat,
    should I go with a .187 cable or .250 cable , this will be a 6s batts.
    thinks Darryl
    Tags: None
    • 785boats
      Wet Track Racing
      • Nov 2008
      • 3169
      #2
      Darryl.
      A .187 flex is plenty for a 6s setup in a GP400. That's all I run.

      As for the difference between a 5mm & 8mm shaft? The longer the motor the more prone to 'Whip' the shaft is. I've just ordered (& received) a 4" (100mm) motor, & went for the 8mm shaft to keep the vibration down.
      Even an 82mm motor with an 8mm shaft sounds so much smoother than a 5mm shaft.
      See the danger. THEN DO IT ANYWAY!!!
      http://forums.offshoreelectrics.com/...hp?albumid=319
      http://forums.offshoreelectrics.com/...hp?albumid=320

        Comment

        • darryl whitman
          Senior Member
          • Sep 2012
          • 535
          #3
          thank you , this is a big help, darryl

            Comment

            • ray schrauwen
              Fast Electric Addict!
              • Apr 2007
              • 9471
              #4
              Not beating up on you just thinking out loud... If a 5mm shaft can create whip which it does, why not 1/4" cable? Less whip right? I use 1/4" cable in my 2, 6S boats because they run on 2P and are large & quite heavy. Both boats have short 11" long flex shafts.


              Originally posted by 785boats
              Darryl.
              A .187 flex is plenty for a 6s setup in a GP400. That's all I run.

              As for the difference between a 5mm & 8mm shaft? The longer the motor the more prone to 'Whip' the shaft is. I've just ordered (& received) a 4" (100mm) motor, & went for the 8mm shaft to keep the vibration down.
              Even an 82mm motor with an 8mm shaft sounds so much smoother than a 5mm shaft.
              Nortavlag Bulc

                Comment

                • olwarbirds
                  Magic Smoke Wizard
                  • Oct 2012
                  • 1136
                  #5
                  I've got same boat using same motor 8mm shaft, get a MBP collet (great investment)...I've been wondering about whip/vibration..would using a .250 flex to 3/16 shaft really make that much of a difference. I thought about doing this on 8S and up...GP400 nice choice, Mike builds/designs great boats.....DJ
                  Tunnels-PS295. Cats-H&M M1 Supercat Daytona rivercat. Monos-DF Cyberstorm HiTech 29. Hydros- Ms K Vac-U-Pickle Custom built 37" shovel 10th scale converted to FE Shadow. Rigger-H&M Evo II. AQ Harbortug recovery boat. Build in progress 37" cf Dragboat

                    Comment

                    • 785boats
                      Wet Track Racing
                      • Nov 2008
                      • 3169
                      #6
                      Originally posted by ray schrauwen
                      Not beating up on you just thinking out loud... If a 5mm shaft can create whip which it does, why not 1/4" cable? Less whip right? I use 1/4" cable in my 2, 6S boats because they run on 2P and are large & quite heavy. Both boats have short 11" long flex shafts.
                      Ray.
                      There seems to be some confusion here.
                      The whip, or vibration, I'm talking about is within the motor shaft. Not the flex shaft. The OP was asking about the pro's & con's between the 5mm & 8mm motor shafts.
                      All I was saying was that a long 5mm motor shaft can whip, especially if the rotor magnets are slightly unbalanced. The vibration can be quite horrendous. An 8mm shaft is much smoother in the longer 92mm & 100mm etc motors.
                      I've had to replace a 5mm shaft rotor in a brand new TP Power motor because of the whip/vibration.

                      DJ.
                      Yes. Up to 6s set ups I use 3/16" shafts. But on the 8s boats I use 1/4". Not because of any whip or vibration issues with the flex shafts. Just for the strength.

                      Cheers.
                      Paul.
                      See the danger. THEN DO IT ANYWAY!!!
                      http://forums.offshoreelectrics.com/...hp?albumid=319
                      http://forums.offshoreelectrics.com/...hp?albumid=320

                        Comment

                        • olwarbirds
                          Magic Smoke Wizard
                          • Oct 2012
                          • 1136
                          #7
                          Paul, thank you my brother down under. As always your knowledge helped me again.... DJ
                          Tunnels-PS295. Cats-H&M M1 Supercat Daytona rivercat. Monos-DF Cyberstorm HiTech 29. Hydros- Ms K Vac-U-Pickle Custom built 37" shovel 10th scale converted to FE Shadow. Rigger-H&M Evo II. AQ Harbortug recovery boat. Build in progress 37" cf Dragboat

                            Comment

                            • darryl whitman
                              Senior Member
                              • Sep 2012
                              • 535
                              #8
                              me too! thanks for the info.

                                Comment

                                Previous template Next
                                Working...