Translations:Manuals:MB Plus:Parametermenu A/5/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, the artificial horizon can be readjusted. To do so, activate AttitudeControl at Parameter menu point A via the transmitter‘s AttitudeControl channel to switch from trimming of the servos to trimming of the horizon. The Status-LED will flash indicating that AttitudeControl is on (if the Status-LED is lit permanently, you are in servo trimm mode as described above). 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 to the specific direction. Touching the stick repeatedly or holding it for longer time will trim the horizon by several steps. The Status-LED indicates the trim values: when it lights in blue color both angles are 0 degrees resp. they are in the factory setting. If the Status-LED lights red, one or both angles are adjusted slightly. If the Status-LED is purple then one axis is trimmed by more than 5.0 degrees. When the Status LED goes out, one of the two axes is further trimmed than 10.0 degrees, which is the limit for each axis! By moving the rudder stick you can remove the trimm that has been set since entering this menu point.
Place the helicopter in horizontal position and you should be able to see the effect of trimming. Note that the helicopter usually is slightly tilted to the side in hovering flight due to the drag of the tail rotor. Therefore as a starting point you may trim about 1-2 degrees to the right when using a helicopter with clockwise turning main rotor to make the heli tilt against the rotor torque, but by default it should not be necessary to use any trimming at all. Note that AttitudeControl can not recognize the absolute position of the helicopter. Depending on wind and environmental conditions it may happen that the helicopter drifts slightly into a certain direction during hovering flight. Also long-lasting vibration or fluctuations in temperature can cause the helicopter not always comply exactly the same attitude. Also make sure the MICROBEAST PLUS unit is perfectly aligned to the rotation axis of the helicopter otherwise you the axis will be cross connected together and the calculation of the artificial horizon will not match the real movement of the heli. Therefore only trim in moderate steps and only when the helicopter reproducible drifts to the same direction otherwise trimming can make the drift even worse!
Push the button to save the configuration and to proceed to Parameter menu point B.