I recently had a stall issue on my Volantex Ranger EX QuadPlane without using an airspeed sensor in 15-18mph winds. The firmware was APM Plane v3.6.0. My suspicion is that the Q_ASSIST_SPEED may be a moving target when using only GPS speed because it doesn’t compensate for wind at your tail. You can read details of my latest quadplane test here in the Plane v3.6 forum.
My intention is to update the firmware to Plane v3.8.0 Beta 5 and add an analog air speed sensor. I would appreciate any advice on the following:
Would an airspeed sensor help a QuadPlane flying in FBWA mode?
Is a digital airspeed sensor significantly better than an analog version when using a Pixhawk?