Cross-Axis Relax

Cross-Axis Relax reduces unwanted coupling between control axes -- for example, rudder input inducing unintended roll, or vice versa, due to airframe geometry (a common characteristic on flying wings and some tailless/rudder-heavy designs). Rather than fighting this coupling purely through PID gains, Cross-Axis Relax specifically relaxes the response on a secondary axis while a primary axis is being actively commanded.

This was added specifically to address fixed-wing cross-axis coupling (e.g. rudder-to-roll on normal-stabilization airframes), and is one of the more airframe-specific tuning tools -- see the Mixer tab for related mixing setup.

Tuning

Off by default (Strength = 0) -- it does nothing until an airframe actually shows the coupling it's meant to fix. Roll Strength and Pitch Strength each set the maximum feedback reduction (%) applied to that axis while yaw/rudder is active -- raise Roll Strength if rudder input visibly rolls the aircraft and fighting it through roll PID gains alone feels artificial; only touch Pitch Strength if rudder-to-elevator coupling specifically feels artificially held back. Level sets how much yaw stick input is needed to reach that maximum strength, and Cutoff smooths the yaw-activity detector driving all of this, so relax engages smoothly rather than snapping on/off with every small rudder twitch.