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Unstable Flight Mode on the Phantom 2 Vision

Discussion in 'General Discussion' started by Monterey_man, Feb 16, 2014.

  1. Monterey_man

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    First off, this is my first post as I just got his great little flying camera. Got some great fly-bys on my house with the California Monterey Bay in the background. One thing, however, is that as I was fooling around with this thing (pushing the envelope), I seem to have hit upon a flight mode that is near impossible to exit from. I landed hard and the camera popped out but luckily this was the extent of the drama. It's easy to get into this mode: if you gain altitude at max setting, then abruptly go to no throttle setting, the thing will start falling and almost flip over. Even as I quickly left it alone (center stick on both), the P2 kept on losing altitude for 10+ seconds until it hit the ground pretty hard. Any others ever tried this? I will not - ever- do this again but it was interesting. I think the internal flight control system stabilization S/W is barely able to keep the thing level and cannot seem to regain normal flight mode once it starts. Maybe my first experiences here is only to serve as a warning to others... :shock:
     

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  2. ericdes

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    No throttle for how long? Like more than 3 seconds long?
    Although it SHOULDN'T do this when it flying that high, it seems you have triggered the shutdown sequence, when that occurs, the bird flips upside down falling from the sky like a brick. When this occurs, I assume you should try the CSC (both sticks down and inwards) to start the motors again.

    I wonder why the engines shut down?
     
  3. Monterey_man

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    Hi Ericdes,

    No, the motors were not shut down. The unit just had a tough time (read - impossible for 10+ seconds) in recovering from this flight mode which was a fast downward velocity. The unit was struggling to keep level but ended up swaying back and forth while it was descending at about 1-2m/sec. You could hear the motors changing speed rapidly as it was trying to regain stable flight....
     
  4. havasuphoto

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    Lake Havasu, AZ
    Do a search for "Vortex Ring State", or "settling with power", on this forum and you'll discover why this is happening.
    You are entering your own downwash, and IF you add power, the aircraft will descend even faster until it hits the ground.
    Never, to go zero throttle, and never descend vertically. Always try and descend into the wind, with forward speed.

    The next time you enter that "flight mode"(which isn't a flight mode but aerodynamic condition), apply forward stick, and fly out of it.
    http://www.phantompilots.com/viewtopic.php?f=19&t=7902

    http://www.phantompilots.com/viewtopic.php?f=4&t=7923

    End especially read this one;
    http://www.phantompilots.com/viewtopic.php?f=5&t=5965
     
  5. OI Photography

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    +1

    Not a deficiency of the hardware, just an effect of normal physics that even "regular" helicopters have to deal with.
     
  6. havasuphoto

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    Should be "required reading" before ANY first Phantom flight. Those of us that have been on the forum a few months, see version of your post, on a weekly basis...sometimes more than 1.
    IF, the knowledge we have can be passed on somehow to new owner's, that will prevent 1 crash-than our efforts are not in vain.
     
  7. Monterey_man

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    Now that makes sense....falling fast enough to enter into your own downdraft. Interesting. Thanks for the info. I'll definitely lose altitude with some side motion in the future. I also agree that this should be covered in the manual to some extent.
     
  8. Seahorse

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    We need a Sticky FAQ...

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