TL;DR - Good 4 minute flight, then 2 feet from touchdown on landing, loss of control (yaw, side to side, then began to climb) and I switched to emergency motor stop and caught the darn thing as it fell from about 10 feet. TLOG replay shows EKF warning during the episode.
Logs are provided from both flight this evening… The second flight was glitchy one.
Here’s my build:
Holybro x500 Kit
Holybro Pixhawk 4 w/ Holybro GPS/Compass (BLHeli-S ESCs using Dshot150)
Holybro PM7 PDB
Futaba SBUS receiver (R2001SB)
Holybro 915mhz telemetry
I built this quad about 5 weeks ago. It flew great with default PIDs, and even better with autotune. Care was taken to mount the FC perfectly centered and facing forward. Its been solid in various flight modes.
Had two flights this evening. First was about 8 mins and all was well. Second was a quick 4 minute flight that went well using various modes (loiter, alt hold, drift, and stabilize), and while landing it gets sketchy within about 2 feet from the ground. Could not control it. It began to yaw and move side to side, then began to climb. I initiated emergency motor stop and managed to catch the thing as it fell… Total heart stopper!
I’ve yet to figure out how to use Mission Planner to analyze logs and graphs. I can’t zoom in and out on the graphs correctly… gotta be some trick to it?
I did manage to replay the TLOG and when the episode began, EKF turned amber in the HUD. So, I’m guessing a compass issue. Any help with these logs would be greatly appreciated!