VStabi Pioneer of Flybarless

Using a VBar you have free your mind from some knowledge concerning flybarred helicopters in the past. For example there is no direct connection between a stick movement and the servo throw and direction. The stick movement requests a target (turning) rate to the VBar only. VBar will move ther servos in the right way on its own until the heli reaches the given target rate according to the pilots stick command.

For the correct function and best result, it is required that the TX outputs all stick commands into the direction, with the center position and maximum values as we expect on our input from the RX. It is required to calibrate the TX to our expected signals. Therefore we use the servo direction, servo center (sub trim) and servo maximum in the TX for each of the 4 stick functions. The movement of the "real" servos inside our heli will not be set up here, this must be set in a later step in the VBar software seperately.

Select the TX calibration tab

1. Set the stick signal directions for collective, aileron, elevator and tail according to our labels on the screen. Use the servo reverse in tx to get it right. For a check there must be all bars blue with positive collective, aileron and tail to right, elevator nose down.
    
2. Set the center values to 0 %—Move all sticks to center (use linear collective curve) and adjust with the servo trims (subtrims) in tx. If they are related to flight modes/conditions (not global), check for each mode. Do not use the trim pots next to the sticks of the tx. At the end you must have 0 % on all 4 stick functions.
    
3. Set the maximum target rate signal to +/-100 %.—Just move the sticks to their end positions and set end points using the servo throw setting in the tx until you reach 100 % in our pc display.
    
4. As a last step we do a restart (set center) to learn the new center values as on every VBar power up. If they were too much offset from 0 % we will show a warning (multiple swash twitches) and create a entry in our event log.

You may find some examples in the documents linked below. Also check your failsafe settings according to the first document below.