Collision with ground

[MariaALJ]

Hello,

I installed the JSBSim plugin on a personal project where my aim is to control the flight path. It has been working pretty well in flight mode but i have a problem when it comes to the take-off : I put a simple plane to simulate the ground in order to control take-off. The aircraft starts at initial coordinates (0,0,0) but when I hit play the aircraft sinks into the ground to the coordinate z=-335 and whatever initial z coordinate I put, it will always go back to -335 and then the aircraft can't achieve the take-off.

MyProject4.-.Unreal.Editor.2023-03-28.11-47-21.mp4

Any ideas of what could be the cause of this to happen?

Thank you in advance.

[gallonmate]

It's a bug that was introduced in UE5.1
There is already an Issue started here: #786
It's not fixed yet but for now you can work around the issue by doing this:

The work around for that is to set Start on Ground to false in BP Airliner in the Details of the level editor.

For some smaller aircraft, seems you can still use Start on Ground, as it's not broken for all aircraft.