Wobble / oscillation on CCW blade arms

Posted by Craig Huber on January 6, 2013 at 6:45pm

Hi all, new to the quad copter game, and just took my first flight today with the APM 2.5 and a delrin framed quad in X configuration.  Followed all the tutorials, wiki pages and documentation I could get my hands on.  In stabilize mode it runs fairly well.  Two issues I have:

1.  When hovering, I get an oscillation on the CCW blade arms. keeps wobbling by about an inch either way.  If this doesn't make sense, imagine the CW blade arms are the pivot point, and the CCW arms wobble up / down by about an inch.  How do I tune this out?

2.  When landing, if I land too hard, the copter accelerates and flips upside-down to land.  


Any thoughts?

Thanks!

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Replies

  • Craig Huber January 8, 2013 at 6:36am

    Was afraid you were going to say that... Yes I have individually calibrated the motors / escs.  Wondering if I should run a bit of "burn in" on the motors, let them run through a pack or two and then re-calibrate.  

  • Dave C January 8, 2013 at 4:06am

    Ok, I'm almost sure this is not a tuning issue, i think you have a prob with one of your motors or ESC's, (the CCW ones) have you tried recailbrating the esc manually (one at a time).

  • Craig Huber January 7, 2013 at 1:52pm

    Thanks Dave.  

     

    Props are 10x4.7

    Motors are A2212-13

     

    Motor specs are here

    list.params

    BPH - Cheetah A2212-13 Brushless Outrunner Motor
    Central New Jersey supplier of radio control models, parts, and accessories. Retail and wholesale to US and Canada.
  • Dave C January 7, 2013 at 3:42am

    Could you tell us what motors and props you are running, and attach your param file?. I'll have a look for you.

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