Translations:Unequal Collective Pitch/7/en

1. Move to the Servo tab and there toggle the Subtrim (tuning) - in this mode servos should be locked exactly at the center (neutral) position. This mode is recommended to be enabled each time when you are configuring mechanical center, including 0° between main blades.
2. By moving with Subtrims move with corresponding servo to set all Servo arms as close to the center as possible (you can do this also for Rudder). (Servo arms should be usually perpendicular with respect to their servo cases).
3. Put push rods/ball linkages perpendicular with respect to the servo arm and swashplate (as close as possible). This mean you have to select which hole of the servo arm is the closest to the perpendicular position. It is always same hole on all cyclic servos. In some models it is unfortunately not possible perfectly which always mean additional error, but you as pilot can't do much about it. Note that also in this step Subtrim (tuning) option should be toggled.
4. Adjust 3 push rods to the same length (if helicopter manual is suggesting same length for all 3 servos). If not, then it adds usually another imprecision to the geometry. But again you can't do much about it. These models can be usually recognized by a design when servo arms are at a different height.
5. Try to set length of the 3 push rods when swashplate is at the center of its Collective Pitch travel. This can be determined by looking at the Anti-rotation bracket of the swashplate where swashplate should be approximately at the center. Adjust lengths of all 3 push rods by an equal amount (so that resulting length is same).
6. Then use the Cyclic Leveler tool and fine-tune lengths of all 3 push rods (usually to be equal again). Subtrim (tuning) option should be still enabled.
7. Mount the Rotor head and adjust length of 2 upper push rods that are connecting blade holders so that they are again equal and at the same time they are configured to reach 0°. This mean when you mount a main blades there and fold ends together, then both ends must be exactly at the same level. And this level should be held at any angle/position/rotation of the main shaft. If not, usually swashplate is not leveled perfectly precise or there is a big play in the mechanics.
8. At this point, if there is no other imprecision in mechanic your model is configured perfectly. Now you can untick the Subtrim (tuning) option and verify if Positive and Negative angles between main blades are equal. If not, then open the Servos/Servo Travel Correction window and move with a sliders (usually it is enough to move with all 3 values by the same amount). If collective pitch is a higher at one side, move the pitch stick to that side (the lowest or the highest position). Then decrease 3 sliders equally to get equal angle as in the opposite direction. When done correctly, you should get precise angles in both directions. Very advanced pilots can use this correction window even at the step 6 together with Cyclic Leveler but this is usually not necessary.