Translations:Manuals:BXFbl:Quicktrim/7/en
Trimming the artificial horizon (optional)
If the helicopter is not aligned horizontally as desired with active AttitudeControl, i.e. drifts to one side in hovering flight, the artificial horizon can be readjusted. To do so, activate AttitudeControl at PARAMETER MENU point A with the transmitter's AttitudeControl channel and make sure the tail gyro is in Heading Lock mode. By moving the aileron or elevator stick, the roll and pitch tilt of the horizon can be increased/decreased. Briefly touching the appropriate stick will trim the horizon stepwise by 0.5 degrees in the specific direction. Touching the stick repeatedly or holding it for a longer time will trim the horizon by several steps. The color of the Status-LED gives you an approximate indication of how much you did trim, and when the trim has changed the Status-LED will flash briefly.
When you place the helicopter in a horizontal position, you should be able to see the effect of the trimming: when the swashplate is perpendicular to the main shaft, this is the approximate position of the helicopter in flight. Note that the helicopter is usually slightly tilted to the side in hovering flight due to the drag of the tail rotor. Therefore, as a starting point, the system by default has a trim of 4 degrees to the right to make the heli tilt against the rotor torque (using a helicopter with a clockwise turning rotor). Also note that AttitudeControl cannot recognize the absolute position of the helicopter. Depending on wind and environmental conditions, it may happen that the helicopter stays level but drifts in a certain direction during hovering flight. You may use the trim to compensate for this and lean the helicopter more into the wind, but when turning the heli by 180 degrees it will drift even more! So ideally you trim the horizon on a calm day when there is no wind.
As a last note, please be aware that this is not a professional autopilot system. The system can be adversely affected by long-lasting vibrations or fluctuations in temperature. As a result, it cannot be guaranteed that the helicopter will always maintain exactly the same attitude. The performance depends heavily on many environmental conditions. So keep the system as far away as possible from rotating parts on the heli. Make sure the heli runs smoothly and free of vibrations, and make sure the BEASTX System is perfectly aligned to the rotation axis of the helicopter (otherwise the axes will be cross-coupled and the calculation of the artificial horizon will not match the real movement of the heli).