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  1. #1
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    New 6S Big Block Build

    This truck is just not fast enough, so it was time to move on to 6S.

    Leopard 3650 Motor (540 can)
    2090Kv 3.5Y, 4 Pole, 1300 Watts, 28V Max Voltage, 46A Max Amps

    The motor bolts right up to the Tenbol mount and the motor shaft is 1/8", just like the Castle 1406. The motor has 6mm bullet plugs and the Mamba Max Pro ESC has 4mm plugs, so I ordered some adapters to make that connection. I trimmed the Tenbol mount to accept a 47T pinion gear. I'll be running 47/45 gearing and two 3S 2200mah 65/130c batteries in series.








  2. #2
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    Handling gone! But speeeeeed! Have to see some vid!

  3. #3
    RC Turnbuckle Jr. Petertje60's Avatar
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    Very smart motor choice. Relatively low amps, so the 'find-the-right-battery' problem is diminished.

    I'm very curious how you like it.
    Nobody is born with experience.

  4. #4
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    is could help me with my build using the tekin rs8
    Kyosho Inferno VE, Anza Slash, Rustler VXL

  5. #5
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    Quote Originally Posted by gorilla2891 View Post
    Handling gone! But speeeeeed! Have to see some vid!
    I'm going to try to get a video. It's hard to find a cameraman at 6-7 am to go out to my runway when there's not much traffic lol.

    Quote Originally Posted by Petertje60 View Post
    Very smart motor choice. Relatively low amps, so the 'find-the-right-battery' problem is diminished.

    I'm very curious how you like it.
    I haven't ran it yet because I'm waiting for the motor plug adapters to come in. It should be ready next weekend.

  6. #6
    RC Turnbuckle Jr. Petertje60's Avatar
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    Quote Originally Posted by fastmachine View Post
    I haven't ran it yet because I'm waiting for the motor plug adapters to come in. It should be ready next weekend.
    Get your soldering gear to work and make them yourself
    Nobody is born with experience.

  7. #7
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    Very interesting setup!! Yes a vid is a must. Have you had any problems with the Castle 5700kv overheating when you ran 35/50 gearing?

  8. #8
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    Quote Originally Posted by jhengis View Post
    Very interesting setup!! Yes a vid is a must. Have you had any problems with the Castle 5700kv overheating when you ran 35/50 gearing?
    It never got hot on road, but I geared down off road.

  9. #9
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    Fasrmachine, I see you used to have a Castle 5700kV installed.

    http://traxxas.com/forums/showthread...lock-Installed

    Why have you changed to the Leopard 3650 Motor? Is it faster than the Castle 5700kV?

  10. #10
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    What other upgrades do you need to make to a 1/16 Merv/Summit to Handle the extra power?

  11. #11
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Quote Originally Posted by richardmarais View Post
    Fasrmachine, I see you used to have a Castle 5700kV installed.

    http://traxxas.com/forums/showthread...lock-Installed

    Why have you changed to the Leopard 3650 Motor? Is it faster than the Castle 5700kV?
    He plans on running 6S.

    4.2 x 6 = 25.2 volts
    25.2 x 5700 = 143,640
    Well over the 60,000rpm limitation of the motor.

    4.2 x 6 = 25.2 volts
    25.2 x 2090 = 52,668
    Under the limitations of the motor.
    Whatever it is I just said... I could be wrong.

  12. #12
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    What's the benefit of running 6S on small kv, as opposed to running say 2/3S on higher kv? Surely he has to now try fit bigger batteries in the small chassis?

    Excuse my ignorance please.

  13. #13
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Lower amperage.
    Whatever it is I just said... I could be wrong.

  14. #14
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    Quote Originally Posted by Jimmie Neutron View Post
    Lower amperage.
    Sorry I don't understand. Why do you need lower amps?

    Hi KV = high RPM = high top speed low torque/acceleration
    Low KV = low RPM = low top speed high torque/acceleration

    Is the reason he's doing it as opposed to his previous set up to get more torque (at the expense of top speed)? Why not change the gear ratio?

    Is it better to have a low RPM and high torque (low kv high t) motor geared for up for speed, or a high RPM and low torque motor geared down?
    Last edited by cooleocool; 04-02-2014 at 09:10 AM. Reason: merge

  15. #15
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    Lower amperage usually comes with better efficiency. Less heat, less strain and battery drain=longer runtime.
    Lower KV/rpm also bears less stress for the bearings and glue that keeps the magnets on the rotor. You might get a longer lifetime out of it.

    The motor needs a certain power to get the car to a given speed. This power is measured in watts.
    Watts = voltage (V) x current (A).
    As you see, we can get the same power output (watt) with either higher voltage (V) OR higher current (more Amps).

    Its easier to get more voltage from a lipo (by adding a few cells (S)) than trying to suck out more amps.
    With a higher cell count you can get away with a lower C rate on the lipo too and get the same power output.

    High voltage/low amp paired with lower KV then geared up to speed sounds smarter to me than low voltage/high amp + high KV.

  16. #16
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    Hi CMD-J, it's a lot clearer to me now, thank you for a great explanation.

  17. #17
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    Quote Originally Posted by richardmarais View Post
    Fasrmachine, I see you used to have a Castle 5700kV installed.

    http://traxxas.com/forums/showthread...lock-Installed

    Why have you changed to the Leopard 3650 Motor? Is it faster than the Castle 5700kV?
    To be able to run 6S. The Castle 1406 is rated for 3S. I'll find out shortly.

    Quote Originally Posted by richardmarais View Post
    What other upgrades do you need to make to a 1/16 Merv/Summit to Handle the extra power?
    I'm running a MMP ESC, steel transmission gears, steel center driveshaft, steel CVD's on the rear, fresh bearings, and foam tires. I actually broke one of my CVD's in a freak accident and I'm now running the stock driveshaft on the left rear.

    Quote Originally Posted by richardmarais View Post
    What's the benefit of running 6S on small kv, as opposed to running say 2/3S on higher kv? Surely he has to now try fit bigger batteries in the small chassis?

    Excuse my ignorance please.
    Thanks CMD-J. The low kv motors can handle higher voltage and use less amps. You can only go so far with low voltage. The XO-1 has a 1650 kv motor.

  18. #18
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    Thanks fastmachine, will be good to hear how it goes. Good luck!

  19. #19
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    I just ran it up and down my neighborhood street on 6S, and it doesn't move from a stand still. It has to be pushed to get a rolling start and then it takes off. Once it's moving it drives fine. It does not do this on 2S. I'm not sure what the problem is at the moment.

    I also found a solution to being able to record video by myself.


  20. #20
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    I've got to see a video of this little monster. I have the normal brushless 1/16 revo and it's stupid fast already.lol

  21. #21
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    Well leopard motors have the 28mm can size same as stock! Why not gonna for those?
    There is a 2850 3y 24v max , so no handlig gone....

    And for that i wonder in the real world, since the brushed e-revo comes with a 36mm can and the brushless comes with a 28mm can ... if the brushed e-revo is worst handling the the brushless?

    Just wondering in my mind....

  22. #22
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Yes, due to the higher center of gravity the brushless will have better handling than the brushed at the same speeds. However, due to the added speed and power of brushless, the handling improvement may be insignificant.
    Whatever it is I just said... I could be wrong.

  23. #23
    RC Turnbuckle Jr. Petertje60's Avatar
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    Bear in mind that the 28mm can Leopards have a 4mm shaft. I searched myself cross eyed to find pinions for that. No luck. So I filed the shaft to 3mm. Not the most easy job.
    If you can drive the car on 2S and it wont work on 6S, I guess your problem are the lipos not being able to supply enough juice for a take off. You might try to gear down a bit on 6S.
    Nobody is born with experience.

  24. #24
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    Quote Originally Posted by Petertje60 View Post
    Bear in mind that the 28mm can Leopards have a 4mm shaft. I searched myself cross eyed to find pinions for that. No luck. So I filed the shaft to 3mm. Not the most easy job.
    If you can drive the car on 2S and it wont work on 6S, I guess your problem are the lipos not being able to supply enough juice for a take off. You might try to gear down a bit on 6S.
    I know that 4mm shaft! but even the neu's we have to file for the pinion hex



    -And cut the longer shaft!

    -I never done a 4mm shaft to 3,2mm but with this dremel tool i guess it's just like butter!

    How do you had file yours? Can tell?

  25. #25
    RC Turnbuckle Jr. Petertje60's Avatar
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    Quote Originally Posted by targetingxmod View Post
    I know that 4mm shaft! but even the neu's we have to file for the pinion hex



    -And cut the longer shaft!

    -I never done a 4mm shaft to 3,2mm but with this dremel tool i guess it's just like butter!

    How do you had file yours? Can tell?
    I connected the motor to an ESC and made It turn on low rpm and held the file against the shaft.

    sent from my Acer S500 using Tapatalk
    Nobody is born with experience.

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