Quad is unstable in GPS only and switches unexpected to failsafe and land mode

ArduCopter
1

Hi there,

I got a APM 2.6 flashed with latest copter firmware.

When not in any GPS-envolved mode everything is just fine.
But when I activate any mode that uses GPS (e.g. PosHold) there are several strange behaviours.
I wonder if anyone had similar problems and is able to show me the right direction.

The unexpected behaviour is:

  • Position is not hold, but Quad kind of “circles” around the PosHold-Point in a spiral.
  • Telemetry kind of freezes during transmission (seen in MissionPlanner)
  • some time during the test-flight the FAILSAFE gets automatically activated.
    It is not configured or activated in any way. There is also no indication why
    failsafe would activate (e.g. RSSI > 20%).
  • the LAND mode gets activated unexpected and untriggered.
  • the APM cannot be disarmed but wil instead flip over (after already landed safetly)

If need be I can upload a TLOG somewhere.

Greets
Tam

2

APM boards aren’t supported anymore and I’m pretty sure you haven’t flashed Copter 3.4 to it, so I changed the category.

3

The circle spiral is caused by the compass being off. Without the Flight log off the copter hard to determine why it went into failsafe mode. Could be because of some flight controller failure such as GPS.

Mike

4

As Mike said, you will need to post a data flash log from the copter before anyone can really say what might be happening.

5

Thanks all,

I will try to get the log(s) and upload them.
It may take a while though…

Greets
Tam