Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 13 of 13

  1. #1

    Join Date
    Apr 2011
    Location
    Kirkland , QC, CANADA
    Posts
    20
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    Trucks stutters bad



    I am new to RC for the most part. I just got a used short course truck but it stutters no matter what I do when I press on the throttle. Both in forward and reverse.
    What can it be?


  2. #2
    SyCo_VeNoM's Avatar
    Join Date
    Jul 2007
    Location
    chicago, IL
    Posts
    12,282
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    brushless, brushed?


    as for stuttering could be many things
    poor batteries, bad motor, bad ESC, radio dying, gearing, or bad servo(yes they can cause it)
    With great speed comes greater repair bills.
    Click on My models to see some of what I own. Eventually will add the rest

  3. #3

    Join Date
    Apr 2011
    Location
    Kirkland , QC, CANADA
    Posts
    20
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    Ah sry, brushless.

  4. #4

    Join Date
    Nov 2006
    Location
    ABC WORLD, IL
    Posts
    2,494
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    If it's brushless then I would start with the battery... A dead battery or one that can't supply the necessary voltage will make the motor studder badly. Make sure the battery is fully charged and try again. If you know someone with a LiPo pack try that.

    Poor signal would be my next guess. I had a RTR brushless truck that would move about 10ft then studder. Turned out the receiver was toast right out of the box....

    My last two guesses are the most expensive to fix but could be the problem. An over heated brushless motor will act the way you are describing as well and there is only one way to fix that and it's replacing it. Same goes for the ESC. Normally when they overheat they just die. Sometimes they live one with poor performance.

    Start with the battery and receiver and go on from there.

  5. #5
    controlliner's Avatar
    Join Date
    Mar 2009
    Location
    Kingston, NS, CANADA
    Posts
    1,118
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    It may be a condition called "Cogging". It may happen if you are not pushing the amps to the motor. It may be the battery gone south, Worst case it may be a toasted field coil on the motor or the ESC.
    \"Keep it clean and not too lean\" Duke Fox

  6. #6
    phmaximus's Avatar
    Join Date
    Jun 2008
    Location
    Adelaide, AUSTRALIA
    Posts
    6,205
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    might just need a coffee, im like that in the morning.
    LOSI: 5IVE-T, 8IGHT-E, MICRO SCT
    Tamiya: TL01MT, TL01B, TA01RA, Clodbuster
    Traxxas: Slash 2wd, Axial: SCX10 Honcho
    Hobao: Hyper 10e, River Hobby X-Ranger

  7. #7
    SyCo_VeNoM's Avatar
    Join Date
    Jul 2007
    Location
    chicago, IL
    Posts
    12,282
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    BTW forgot to add the list of what I said could be wrong is what I would work from in that order
    Problem with diagnosing BL trucks is that without a 2nd set of electronics its very hard to be 100% certain seeing you have to swap parts out one at a time

    Sad thing is if it was brushed it would be way easier to diagnose
    With great speed comes greater repair bills.
    Click on My models to see some of what I own. Eventually will add the rest

  8. #8

    Join Date
    Apr 2010
    Location
    Traverse City, MI
    Posts
    1,046
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    Is it all speeds or just when you start to move? Does it smooth out when you give it more throttle?
    HPI Baja 5SC, TLR 8ight 2.0, Traxxas Stampede 4x4 VXL and one very pissed off wife.

  9. #9

    Join Date
    Apr 2011
    Location
    Kirkland , QC, CANADA
    Posts
    20
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    Thanks everyone, I am going to try and get my hands on another ESC to try.
    The battery is fully charged.

    Sigma, its only when I start to give it a bit of throttle at the beginnig. Once I get the revs up it goes away.

  10. #10
    SyCo_VeNoM's Avatar
    Join Date
    Jul 2007
    Location
    chicago, IL
    Posts
    12,282
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad


    ORIGINAL: mtlrcguy

    Thanks everyone, I am going to try and get my hands on another ESC to try.
    The battery is fully charged.

    Sigma, its only when I start to give it a bit of throttle at the beginnig. Once I get the revs up it goes away.
    that would be cogging generally from over gearing, or funky motor KV's
    like I had a 1200kv motor that would do that like crazy. Turned out to be a defect in the companies 1200kv motors...
    With great speed comes greater repair bills.
    Click on My models to see some of what I own. Eventually will add the rest

  11. #11

    Join Date
    Apr 2010
    Location
    Traverse City, MI
    Posts
    1,046
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad


    ORIGINAL: mtlrcguy


    Sigma, its only when I start to give it a bit of throttle at the beginnig. Once I get the revs up it goes away.
    As someone else wrote, its called cogging. And I believe its perfectly normal. My Stampede 4x4 does it and so did the Slash 4x4 that I used to own. I think it has something to do with not getting quite enoughvoltage (?) at first when you gently or slowly pull the throttle back. It happens to me the most when the LVC kicks on (which is when the esc cuts the power going to the motor). Its never gotten any worse for me so I, personally, wouldn't worry about it.

    EDIT- Are you using NiMH? If you have access to a lipo or at least an NiMH with more cells try that. Cogging is lessened with a more powerful battery. Its almost nonexistant on 2S unless you REALLY pull the trigger back slowly. You could also try gearing down.
    HPI Baja 5SC, TLR 8ight 2.0, Traxxas Stampede 4x4 VXL and one very pissed off wife.

  12. #12
    BKoz559's Avatar
    Join Date
    Jan 2008
    Location
    Madera, CA
    Posts
    1,228
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    To add to this: a LiPo is capable of supplying much higher current and thus cogging effects are often reduced.

    The cogging itself is a fact of life with sensorless brushless motors. Until the rotor inside the can spools up and creates a current with one of the 3 coils around the can, the ESC can't detect it's oriention so the rotor will bounce back and fort a bit between two magnetic fields. Once it's spinning, the ESC can "see" the rotor's position and the timing of the coils will follow the poles of the rotor.
    Part-time RC Mechanic
    RDD Raceway Hobby Shop / Madera, CA
    Slot Cars - RC - Models - Toys

    EXO Terra | SC10 4x4 | DESC210R | SCX10 Rubicon | SCX10 Honcho | Savage Flux HP | RC10 Graphite | RC10GT2 | Sakura S Zero | Vaterra Kemora | Losi Micro T | ECX Torment | Blade 500 3D | Blade MCPx | Blade QX2 350 (coming soon) | Flyzone Cessna Corvalis | HeliMax 1SQ Vcam | Estes Proto X

  13. #13

    Join Date
    Apr 2011
    Location
    Kirkland , QC, CANADA
    Posts
    20
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Trucks stutters bad

    Thanks guys, I will play with it and maybe just learn to live with it as it may be normal for what I have....


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 07:01 PM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.