I get an error message with any aircraft by adriaan. I think it's because I have no idea where to put the contents of the jsbsim folder. What do?
in the jsbsim folder you have 2 folders, aircraft and engine.
open the aircraft folder and copy the speeder folder.
now go to C:\Program Files\Outerra\Anteworld\jsbsim\aircraft folder and paste it in there with the other aircraft folders.
now open the engine folder of the speeder and copy the speederengines file.
go to C:\Program Files\Outerra\Anteworld\jsbsim\engine and paste it there with the other engines!
that should get it running, as long as you installed the speeder .otx file!