@Jaeyoung-Lim I figured that this block
<max_vel>10</max_vel>
<min_depth>0.01</min_depth>
of code was missing in the sdf file. Without this the model was rotating by itself to the right. After adding this block in the sdf, the model now rotates to the left. I don’t understand what this block does.
With this addition, I’m able to arm the aircraft in QGC but I still can’t fly the aircraft even when giving a takeoff command.