Well, I am a newbee with Arduplane, but I manage this SITL for the copter.
I had recently calibrated the Pixhawk (bought on HK some years ago) No servos or motors connected. What should I check / do to make this work?
Here is the messages: 27.12.2019 17:27:11 : EKF2 IMU1 is using GPS
27.12.2019 17:27:11 : EKF2 IMU0 is using GPS
27.12.2019 17:26:44 : EKF2 IMU1 origin set
27.12.2019 17:26:44 : EKF2 IMU0 origin set
27.12.2019 17:26:40 : EKF2 IMU1 tilt alignment complete
27.12.2019 17:26:40 : EKF2 IMU0 tilt alignment complete
27.12.2019 17:26:34 : Airspeed 1 calibrated
27.12.2019 17:26:34 : EspenF-HP-lapto
27.12.2019 17:26:34 : ArduPlane V4.1.0dev (3278ac2e)
27.12.2019 17:26:34 : EKF2 IMU1 initial yaw alignment complete
27.12.2019 17:26:34 : EKF2 IMU0 initial yaw alignment complete
27.12.2019 17:26:33 : GPS 1: detected as u-blox at 115200 baud
27.12.2019 17:26:32 : Throttle failsafe off
27.12.2019 17:26:32 : Ground start complete
27.12.2019 17:26:32 : Airspeed calibration started
27.12.2019 17:26:32 : Barometer 1 calibration complete
After selection of model “Quadplane” simulation started to work. 
Will we have the possibillity of programming Q-modes from Flight Planner also?
28.12.2019 01:01:05 : Land complete
28.12.2019 01:01:05 : Throttle disarmed
28.12.2019 01:00:59 : Land final started
28.12.2019 01:00:50 : Resetting previous waypoint
28.12.2019 01:00:50 : Land descend started
28.12.2019 01:00:49 : VTOL position2 started v=1.4 d=4.9
28.12.2019 01:00:48 : Reset alt target to 32.5
28.12.2019 01:00:48 : Mission: 10 VTOLLand
28.12.2019 01:00:48 : Reached waypoint #9 dist 51m
28.12.2019 01:00:48 : Mission: 9 WP
28.12.2019 01:00:48 : Reached waypoint #8 dist 49m
28.12.2019 01:00:43 : Mission: 8 WP
28.12.2019 01:00:43 : Reached waypoint #7 dist 57m
28.12.2019 01:00:41 : Mission: 7 WP
28.12.2019 01:00:41 : Reached waypoint #6 dist 80m
28.12.2019 01:00:34 : Mission: 6 WP
28.12.2019 01:00:34 : Passed waypoint #5 dist 30m
28.12.2019 01:00:33 : Transition done
28.12.2019 01:00:32 : Mission: 5 WP
28.12.2019 01:00:32 : Reached waypoint #4 dist 32m
28.12.2019 01:00:32 : Mission: 4 WP
28.12.2019 01:00:32 : Reached waypoint #3 dist 6m
28.12.2019 01:00:31 : Transition airspeed reached 18.6
28.12.2019 01:00:31 : Mission: 3 WP
28.12.2019 01:00:31 : Reached waypoint #2 dist 26m
28.12.2019 01:00:30 : Mission: 2 WP
28.12.2019 01:00:28 : EKF yaw reset -2.19
28.12.2019 01:00:27 : Reset alt target to 0.1
28.12.2019 01:00:27 : Resetting previous waypoint
28.12.2019 01:00:27 : Mission: 1 VTOLTakeoff
28.12.2019 01:00:25 : Flight plan received
28.12.2019 01:00:15 : Throttle armed
28.12.2019 00:59:52 : EKF3 IMU0 is using GPS
28.12.2019 00:59:52 : EKF3 IMU1 is using GPS
28.12.2019 00:59:49 : EKF2 IMU1 is using GPS
28.12.2019 00:59:49 : EKF2 IMU0 is using GPS
28.12.2019 00:59:44 : EKF3 IMU0 origin set
28.12.2019 00:59:44 : EKF3 IMU1 origin set
28.12.2019 00:59:43 : EspenF-HP-lapto
28.12.2019 00:59:43 : ArduPlane V4.1.0dev (3278ac2e)
28.12.2019 00:59:43 : EKF3 IMU0 tilt alignment complete
28.12.2019 00:59:43 : EKF3 IMU1 tilt alignment complete