CS6 Irratic motor speed

Discussion in 'Cinestar 6' started by Tony Larkin, Jun 5, 2013.

  1. Tony Larkin

    Tony Larkin Member

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    Hi Guys,

    I'm still a newcomer to the multicopter world so bear with! I've completed 8 flights so far just doing the basics and so far so good. However, the motors seem to be a little erratic at times. When I power them up and go for a take off, as i'm increasing the gas they sometimes reach a point were they stop speeding up and then suddenly catch up. Almost as though there was a 'dodgy' connection on the gas stick. It's still flyable, but i'll get it into a hover and then it might climb with out any input from me. They don't seem to cut out, just in a split second catch up to my gas stick position.

    Not sure if i'm making sense?!

    Tony

    CS6
    MK flghtcntrl v2.1
    quadrocopter motors
     
  2. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Tony, any chance you can post a video with audio of this happening....it's hard to know whether what you're describing is normal as the motors do change speed a lot as part of the aircraft's flight stabilization system.​
    Thanks​
    Andy.​
     
  3. Tony Larkin

    Tony Larkin Member

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    Will do. I got a friend to try and film it on his phone but it didn't really come out that well!! I'll have a proper go at it at the weekend.
     
  4. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    I'm less concerned about the video, actually -- it's more the audio of the motor noise that will tell me what's going on -- the video is not going to show the props correctly because of the stroboscopic effect of the frame rate...

    Andy.
     
  5. Tony Larkin

    Tony Larkin Member

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    Agreed, the frame rate does give an unusual look to a spinning rotor!! I'll try and get some decent audio at least.

    Tony
     
  6. Josh Lambeth

    Josh Lambeth Well-Known Member

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    Did you calibrate your ACC before your first flight? Also, post a GPX file from the copter. That will show what the sticks are doing in comparison to what the motors are doing.

    Josh
     
  7. Tony Larkin

    Tony Larkin Member

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    Hi Josh, The CS6 was built by a company here in England. However, when i took ownership of it, the software was out of date and i made the schoolboy error of trying to update it over wireless! Problems followed, but thanks to help from Andy and Gary we're looking in better shape now. I imagine that now I have upgraded the flghtcntrl and navi board that ACC calibration is required?

    Many thanks for the advice. Do i need extra software to get a GPX file?

    Tony
     
  8. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Tony: The GPX files will be created by the Navigation Control board when:
    1. The GPS board has sufficient signal to get a date from the GPS satellites.
    2. There is a microSD card installed in the Navigation Control board.
    3. You increase the throttle to more than 40%.

    To analyze the resultant GPX file the program that I like to use is MK_GPXTOOL: http://www.mikrokopter.de/ucwiki/en/MKGPXTool

    <shamelessplug>
    Oh, yeah....and there's this idiot who's created a DVD set on GPX files and how to use MK_GPXTOOL and Google Earth to analyze them....contact Quadrocopter and ask about it. I just shipped some of those DVDs to QC. :) :)
    </shamelessplug>

    Andy
     
  9. Tony Larkin

    Tony Larkin Member

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    Andy, Thanks once again for your advice. Unfortunately, i'm working away a lot at the moment so time on the project is limited. For a few weeks anyway.

    Hey, i heard about a lad from South Yorkshire creating some great DVD's! Ordering them is certainly on my 'to do' list.;)

    Tony
     
  10. Tony Larkin

    Tony Larkin Member

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    I think this was something to do with the compass. I re-calibrated it and since then it's been fine!

    Tony
     
  11. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    The compass information is used to help stabilize the copter in yaw, I believe Tony. So your compass recalibration is consistent with that idea.

    Andy.
     
  12. Gary Haynes

    Gary Haynes Administrator
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    Check the expo settings and stick 1 curves on the TX. Throttle should not have a curve. If it has one take it out. Might solve it for you.
     

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