Translations:Manuals:AR7210FblV5:Parametermenu/10/en
Torque precompensation/RevoMix (F)
The advantage of always knowing the collective and cyclic inputs allows the AR7210BX receiver to help the tail gyro holding the tail in position. It can precompensate for the torque variations on the tail rotor, just before any noticeable deviation occurs. This method of torque precompensation (RevoMix) relieves the tail control loop and improves the tail performance, especially when using the AR7210BX on helicopters with insufficient tail authority and/or extreme motor torque (e.g. overpowered electric helicopters) where the tail does blow out for a short moment when applying a sudden collective or cyclic input.
In general you can see the compensation when you move the collective or cyclic control sticks. With precompensation activated the tail rotor has to produce a deflection which must counteract the rotor torque. Since at 0° pitch the least torque is applied by the main rotor, also the tail rotor makes the least deflection and the tail slider is in center position. If you pitch in positive or negative direction or move aileron or elevator control, a deflection will be added to the tail rotor which will act against the torque of the main rotor. For helicopters with clockwise rotating main rotor, the precompensation has to always push the tail to the left (nose of the heli to the right). For helicopters with the main rotor turning anti-clockwise, the precompensation has to push the tail to the right (nose of the heli to the left). The deflection will be to the same direction, whether positive or negative pitch, as the torque only increases. So when doing the adjustment first of all check which direction is needed for your helicopter. Then choose the amount of precompensation from the given preset or adjust freely using the StudioX Software/StudioXm App.
When doing the adjustment on the device the rudder servo will directly move into the direction of compensation. So you can easily see, where the tail will move when adding pitch. When precompensation is set to "high" the servo will move further than with "low", so you get an additional visual reference of what you're adjusting at the moment.
| Status-LED | Torque precompensation/RevoMix |
|---|---|
| purple | off |
| red flashing | low - normal direction |
| red | high - normal direction |
| blue flashing | low - reverse direction |
| blue | high - reverse direction |
Use torque precompensation when the tail does go away in torque direction when applying a sudden pitch input, even if the tail gyro gain is properly setup. Increase the amount of precompensation stepwise until the tail holds well. If the tail is moving against torque direction, the amount of precompensation is too high already. If the tail is blowing out even worse when torque precompensation is active, probably the direction of torque precompensation is wrong! If you can't find a good adjustment check the mechanical conditions. Use different (larger) tail rotor blades or higher tail rotor speed to gain better holding force. Also check your tail gyro gain. If the tail gyro gain is very low in general and the rudder tends to oscillate very easily move the linkage ball on the servo horn further inwards to the center. If on the other hand you have a very large amount of tail gain and the tail gyro still does not seem to be capable to hold the tail rotor in any flight condition, move the linkage ball on the servo horn further out from the center, to get faster response speed when the gyro needs to control the rudder.
Torque precompensation can only be used when you have 0° of pitch at SETUP MENU point H (servo trim)!