Hi, all.
Based on your suggestions, I tested my AQ6 again.
1.I made various Thr_Factor. I got the best value.
In manual mode, the middle thro was close to 700 (695-698), Fig1.
2.Based on the configuration, I engaged in Position_Hold.
Why did the middle thr become 820 (or a little more), Fig2? Should be 700? My deadband of thr was 100.
3.I checked the Hacc. The value was lower then 1.5 when I let my AQ6 fly forward, Fig3.
However, altitude still dropped.
The difference between Pres_ALT and ALT was much, Fig 4.
These tests were executed in night.
I also changed a different foam and removed Pixhawk anti-vibration platform, Fig 5.
I did not rotate my IMU, Fig (I added blue gel to fix the board).
Today's log was here (https://www.dropbox.com/s/ob9gmuriez3d6 ... L.LOG?dl=0).
So tired....and sorry for your inconvenience....><....