Any progress on this issue? I tried to run a few simple VTOL missions in SITL + Mavproxy, and am also experiencing problems similar to what @Echo has encountered. I am using Plane 3.8.4 firmware, and flew at SITL’s default location (CMAC).
Despite changing the value of Q_WP_RADIUS (from the default 200cm to 1000cm, and even to extremities like 9000cm!), the aircraft simply ignores the value of Q_WP_RADIUS.
For example, in the screenshot below, the console shows that the aircraft reaches the waypoint once it reaches ~20 of the waypoint, but this remains constant even when Q_WP_RADIUS is changed.
I have attached 4 sample log files here (0cm, 200cm, 1000cm and 9000cm): https://drive.google.com/open?id=1zkdMKwRIknV0eSdgIbTxBjaumNZqvJ9R
I have also attached the waypoint file used here: https://drive.google.com/open?id=174WnYCVB4jOxEEhx7CFNQt1WyP9xQUME
Finally, I notice that an issue has been opened on Github recently (https://github.com/ArduPilot/ardupilot/issues/8677), but has not received any response. Would appreciate if any developer could help to look into this!