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Pixhawk 3.3.3 slow yaw at first flight attempt

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@Riccardo wrote:

Hi,

I just finished mounting my hexa X6. The setup is:

  • 3DR Pixhawk with APM 3.3.3
  • Tarot X6 960 frame
  • Tarot 5008 motors
  • 18x55 CF props
  • T-Motor 40A ESCs
  • UBlox M8N GNSS external GPS
  • FrSKY X9D+ and X8R receiver
  • 10A Tattu 25C LiPo

Everything has been calibrated, from ESC to Radio.

At first flight attempt, in Stabilize mode, I've been able to just lift it of 1 cm. (yes, actually not lifted) because the X6 starts to slowly yaw counterclockwise.

The yaw stick from the radio TX does NOT control yaw, despite the radio is calibrated and it correctly reports its values on the APM Planner on my Mac (connected with SIK V2 telemetry radio to the copter).

I tried to use Loiter mode, and the copter flipped backwards upside down.

I remember to have checked the motors wiring according to Ardupilot Wiki, will double check today.

Anyway, what could be the problem?

Another strange behaviour is that APM Planner reports me FCU errors randomly: bad accel health, for instance, but if I power cycle the copter, it disappears.

Any help would be very very appreciated.

Thanks.

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