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.