So I finally got around to flying a test mission to reproduce the 40' YOYO anomaly with my craft. The DAT file can be
downloaded here. (I posted the wrong link before, 30min ago). I haven't used any deciphering tool with DAT files, only flight log .txt files. Can someone provide a link where I can upload this 103MB file and analyze the data?
I just created a ticket with DJI and sent them this file. They said they would be sending it to China for analysis. Seems strange they can't do that analysis in Carson, CA where they are repaired. Their first response is to redo the IMU calibration. I've done that and will take it out this weekend. I don't expect that to improves things, but I hope I'm wrong.
This flight for the DAT file above was very strange. The first anomaly starts at about 2:13min into the flight while in P-GPS mode when I'm hovering in one place, it goes up and down about 40' with no stick input. Then I decide to switch to S mode at 3:14 and make a hot lap around to hopefully get the system to clean itself up in S mode. I wanted to see if this anomaly was mode specific. I came back in front of me to hover again, then at about 4:30 in S mode the same behavior occurs, going up and down 40 to 50' with no stick input.
So after these two spontaneous ascent/descent events I decided change modes again at 5:05 back to P-GPS mode and come in to land because this craft is acting whacky. On the way back at around 5:35 or 5:45 I’m trying to descend with full down left stick and it won’t descend in P-GPS mode, which is very strange, I've never experienced that before. So at 5:50 I switch back to S mode which allowed me to descend like normal and land.
Note, when I’m low to the ground within 25’ I have not seen the craft go up and down randomly, I’ve only had this happen when it’s above 60’. I think VPS is preventing the erratic up/down behavior when less than 30’ AGL.
Another abnormal thing about this craft is P-GPS with OA enable will only do about 13 to 15mph with no wind. I've had it up to 19mph going with the wind, but that's cheating. OA doesn't seem allow my craft to go the max speed of 22mph like others have reported. Hence, I rarely use OA on this craft being so slow.
Here's the Healthydrone analysis based on the .txt file.
Here's Msinger's log reader data.