FlightGear uses a quasi-obsolete format for its 3d models called AC3D. The wiki says you can export materials and textures from Blender into this format, but I had issues with textures. In the end I found it easier to edit the AC3D
Tag: space plane
This is the second part of a blog chronicling the development of a FlightGear simulator model for the Open Source Space Plane. Animating retractable landing gear , control surfaces, etc, involves linking a 3D object movement to a flight model variable.