Use of optical flow

thank you for all those informations

I hate to test it as soon as I get the engines and propellers

https://discuss.ardupilot.org/t/the-copter-does-not-takeoff-in-guided-mode-and-ekf-gps-type-3-optical-flow/16751/4?u=alex_mh

is take-off in guided mode using otical flow supported with ardupilot now ?