Hello,
After setting up my new TBS MOJITO wing, i did the maiden flight.
Auto takeoff went well, at least while the plane was climbing straight.
But once target altitude was reached, Ardupilot did some strange manover, that led to upside down flight: first banking to the left and then banking to the right way to much to reach roll >180°.
Upside down flight was “ok” , i mean stabilised but with some slow altitude loss. I quickly switched to manual mode and in the end, I succeed to land the plane later.
bin log file : https://drive.google.com/file/d/1UBp6A_h9v4KfwW39CGN8ZLyHfVuaCOf-/view?usp=sharing
Video of the flight ( recorded by walksnail google X with OSD) : https://youtu.be/iBSPYdOUzwE
Almost the same FC & settings works fine on a AR WING PRO.
When doing some analysis on PID and roll data, when the plane start to bank too much at 5:23.748 sec, the navroll is at 50° (as expected) but the real roll cross the navroll to reach 180° ( up-side-down )
Does someone is able to find the root cause of this bad behaviour in auto takeoff ?
This TBS MOJITO wing was designed to fly fast with 3220 motor and APC 8x8 props.
- Could the torque roll of such a propeler explain the roll behaviour ?
- When looking at servo output : the servo 3 and 4 value are very small ( between 1400 and 1600) when the plane is going very fast (above 50m/s), could this explain the loss of attitude control ?
I strongly suspect those settings to be the root cause of too low value on evelon servo output.
AIRSPEED_MAX = 28 m/s
AIRSPEED_MIN = 12 m/s
SCALING_SPEED = 15 m/s
Frame : TBS MOJITO
FC : MATEK H743-WING
LionPack 8S custom mafde with Molicell P50B
Motor : AOS 3220
Propeler : APC Sport 8x8
ESC : Flycolor X-Cross HV 80A
AUW : 2.3kg
Regards,
Romary