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Bottom left Prop laggard

Discussion in 'Inspire 2 Discussion' started by slim.slamma, May 24, 2018.

  1. slim.slamma

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  2. mmarian

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    How does it feel when spun by hand comparing to the other three?
     
  3. slim.slamma

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    Temp is good

    Hand spin good

    I was looking at some of my footage, pixel peeping actually and just happen to notice it. 85% of the time I record my take-offs.

    Only on that particular time did this occur. Figured I’d share.
     
  4. mmarian

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    I'd say keep your eye on it. In simple terms, it should not be like that. It could be a sign of a bearing going bad..
     
  5. slim.slamma

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    :mad:
     
  6. mmarian

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    Don't stress. I said could;). It could also clear up by itself and go good again. Just keep your eye on it and if it gets worse or develops unusual sound then it is time to do something about it.
     
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  7. MrTVR

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    I’m not sure what you are concerned about?

    Is it that the left rear prop appears to stop spinning momentarily just before take-off?

    If so, then this is likely to be an illusion caused by the strobe effect whilst the prop speed happened to be in sync with the frame rate of the camera that captured the video.
     
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  8. mmarian

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    I
    I would like to hope that he did not rise this concern based on watching his own video. He said one laggard prop, so I take his word for it..
     
  9. slim.slamma

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    That got a smile out of my stone face.
     
  10. mmarian

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    Do not celebrate just as yet;)
     
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  11. slim.slamma

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    Yes Sir the momentary stop caught my eye.

    But it's just that 1 rear left.

    Ok though I hear you, the frame rate. Pondering now for sure.
     
  12. slim.slamma

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    From a different perspective I love my Uk members.
     
  13. MrTVR

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    My reading is that he noticed it when watching the video, as that is what he said...

     
  14. slim.slamma

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    You right

    But why that 1 prop?

    More homework for slamma, I guess.
     
  15. slim.slamma

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    Let's me see if I can find the DAT
     
  16. MrTVR

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    Good question more research needed
     
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  17. slim.slamma

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    I’m on it.
     
  18. The Editor

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    I wouldn't worry about it.
    If you look, your right front prop appears to idle faster than your left rear.
    All motors will constantly change speed depending on what the IMU tells the flight controller to do. Don't forget you are not actually flying these machines, the flight controller is.
    As soon as you apply throttle, the IMU senses the slight change in attitude of the aircraft and will apply a little more thrust to the rear left motor.
    You might want to try an IMU calibration but more than that I would not concern yourself. :)
     
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  19. mmarian

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    If I knew that the OP was concerned based on watching the little video he recorded himself I would not even mention the bearings etc. Video can play crazy optical ilusions when the frame rate start to sync with the spinning frequency. It can make the wheels of a moving tractor look to spin backwards for example. To sum it up, video is a totally and completely unreliable indicator of propeller laggardness.:p
     
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  20. The Editor

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    Yup - doesn't get more crazy than this.....
     
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