When you arm in Virtual RC by Joystick mode and you have your RC switched on there is no way you can control the plane because the elevons jitter between the RC and joystick commands. Only if you switch off the RC you can control the plane with the joystick.
PX4 1.7.3 QGC 3.3 Joystick: Mad Catz F.L.Y.5 Flying Wing. (VTOL)
When you arm in Virtual RC by Joystick mode and you have your RC switched on there is no way you can control the plane because the elevons jitter between the RC and joystick commands. Only if you switch off the RC you can control the plane with the joystick.