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Slow moving forward, Descent, Yaw, and VRS crash.

Discussion in 'Phantom 2 Vision + Discussion' started by mark3, Jun 25, 2014.

  1. mark3

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    Dear all

    http://youtu.be/6NKM6FtWPs8

    Fell into VRS and finally crashed. As some other threads mention, VRS usually goes after a sharp descent and "yaw". It is also true for my crash video.
    If that is the case, does it imply that spiral descent is not a good idea as far as VRS is concern ?

    Thanks
    Mark



    Date & Time: 2014/6/22 AM7:00
    Weather: Clear
    General Description:
    0. With Prop guard
    1. Distance to Controller: 526M, Attitude: ~40M, Line of Sight. --Naza-M/GPS Att Mode--
    2. This is the 2nd battery Run, 1st battery run is very normal.
    3. Video channel is still working after the crash, able to update "Find my phantom 2 vision"
    4. Can't do flight control any more after the crash.
    5. Remaining battery: More than 50%
    6. Available GPS satellite: More than 9
    7. RC Controller: Green Light, FCC mode --Non-Modified--
    8. P2V+ is purchased in 2014/5/31 --Body Non-Modified, SN:pH645XXXXXX V2.0, Model No. PV331--
    9. Last time Successful flight: 2014/6/21 --One day before the crash--
    10. Last time IMU Advanced Calibration: 2014/6/20

    Version Info:
    =======
    Main Controller: 3.04
    Receiver;5.8G: 1.0.1.3
    P330CB: 1.0.1.30
    Batterny: 2.0.0.0 --DJI authentic--
    == Discharging Time: 15
    == Percentage of Life: 95%
    == Serial Number: 600XX
    Zen IMU: 1.0.0.4
    =======
     
  2. Double-D

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    Re: Descent_Yaw_VRS

    That's just crazy. It's looks as though it hardly yawed at all.
    What was your decent speed it's hard to tell?
    The prop guards must have been a major contributor.
     
  3. mark3

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    Re: Descent_Yaw_VRS

    Don't quite clear the exact m/s descent rate, but it's definitely not sharp.

    My guess is that a sudden yaw (rotation) in a descent and slow approaching process may reduce the momentum of moving forward, while the momentum is essential in escaping downwash current that may furtherly induce VRS.