Axes Convention¶
All signs in the system are managed according to the international aeronautical axes convention: It is considered positive any deflection that generates positive rotational forces or moments about the aerodynamic centre of the aircraft, except for “y” axis (elevator) where it is considered negative a positive moment.
Sign Convention
Example, an elevator down position will generate a positive pitch so the elevator is considered positive on down position. Main actuators rules:
Actuator |
Positive |
Negative |
|---|---|---|
Elevator |
Down |
Up |
Rudder |
Right |
Left |
Right Aileron |
Up |
Down |
Left Aileron |
Down |
Up |
Tail Rotor |
Right |
Left |