My plane is about 5.5kg, wingspan 1.8m.Firmware 3.5 As below 。
The altitude fluctuating more than 10m .Here is my test,the designed altitude below was 100m.It flies well in FBWA mode, maintain the airspeed well, hit the flight course well.
And i try to do the TECS tuning ,including adjusting TRIM_ARSPD_CM,TRIM_THROTTLE, TECS_TIME_CONST.But without apparent improving.
Log is a little big,you can download it below.
Hoping your reply,Thanks.