Thanks for your reply!

Don't understand completely what you mean with'plane', but if I copy the way that the tyre of the 'buggy' is placed in MED, it should work?

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt