On a brand new MPP (30 flights) I’ve been experiencing, on every other flight or so, what appears to be a breakdown between the IMU and the compass. On Go4, the compass error is displayed, the GPS is then dropped, and it goes into ATTI mode. Sometimes it recovers to GPS-p mode, sometimes it doesn’t. In the flight log txt file, the reason for the failure of GPS is a “compass-error-large” and followed later by a “yaw-error-large”. No Flyxxx.dat files on this MPP.
On those flights where this occurs, the first symptom is a very slow yaw after turning 90 to 180 degrees, flying forward for a few hundred feet and then braking to hover. The slow yaw will last 30 or more seconds before it decays. Meanwhile, the GPS is 20+ and strong. If I the push the flight further, it tends to trip the compass error.
On one flight where this happened, it recovered to P mode. I then experimented by activating RTH. It landed at HP, pointing 180 deg in the opposite direction.
I have had flights where everything is fine. Flies straight instead of a crab angle, no yaw after braking. RTH to within an inch of HP.
All this in spite of numerous FW refresh, IMU and compass calibrations, and RC stick calibration. Also, the HP and flight area is where I live in the Class G boonies and flew over a 1000 flights with my other MPP (now the “nephew”) with never a problem... no magnetic/yaw issues ever.
Something is electronically unstable... compass, IMU???
Any opinions before I send it back?
On those flights where this occurs, the first symptom is a very slow yaw after turning 90 to 180 degrees, flying forward for a few hundred feet and then braking to hover. The slow yaw will last 30 or more seconds before it decays. Meanwhile, the GPS is 20+ and strong. If I the push the flight further, it tends to trip the compass error.
On one flight where this happened, it recovered to P mode. I then experimented by activating RTH. It landed at HP, pointing 180 deg in the opposite direction.
I have had flights where everything is fine. Flies straight instead of a crab angle, no yaw after braking. RTH to within an inch of HP.
All this in spite of numerous FW refresh, IMU and compass calibrations, and RC stick calibration. Also, the HP and flight area is where I live in the Class G boonies and flew over a 1000 flights with my other MPP (now the “nephew”) with never a problem... no magnetic/yaw issues ever.
Something is electronically unstable... compass, IMU???
Any opinions before I send it back?