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Gyro Major Recalibrate

Discussion in 'Phantom 2 Discussion' started by Gary E, Apr 7, 2014.

  1. Gary E

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    Right out of the box, the Phantom 2, after the usual assistant software/firmware updates, etc, and compass calibration before each flight, would not hold position, nor could it be controlled to land on the skids even at 12 inches AGL. It was literally out of control once off the ground. Every time. After multiple crashes with broken props (DJI's)(10 of them) and broken prop guards (cheap ones - never again), and lots of head scratching, the issue was that the gyro was significantly way out of the acceptable parameters.

    Before major calibration: X= 0.0, Y= -0.3, Z= -6.0, MOD= 6.0
    After major calibration: X= 0.0, Y= -0.0, Z= -0.0, MOD= 0.3

    Anyone have this situation with a brand new quad?

    On a side note, the cheap prop guards didn't help the prop situation much. They were too flexible and too close to the prop tips, so when the quad landed at an angle to the landing gear, and the prop guards hit the ground on tip over, the prop guards would flex up in the path of the props. So, the cheap prop guards may have done more harm than good. What helped during the flight testing when the gyro was screwed up, were the outriggers that I put on the landing gear. 7/16" X 18" wood dowels (4 of them) with plastic whiffle balls on each end tie wrapped to the gear. When the quad cartwheeled out of control, or flipped over, the outriggers limited the damage to props and guards.

    All is well now. It holds position and altitude like a rock on a string. No need for the outriggers.
     
  2. ianwood

    ianwood Taco Wrangler
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    Either a bad calibration at the factory or the box took a beating in transit.
     
  3. Gary E

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    I was thinking similar thoughts, like a blunder at the factory. Maybe it's just an aberration, or a lack of quality control at the factory.