Its doubtfull that any X-Plane people are here.
I tried starting a bridge to get 'us' into exporting planes into XP format. The valley was huge, unfortunately. One issue was animations. Seems to be quite difficult. Another 'was' amount of textures. In Flight Simulator, we use huge amounts of textures, while in XP, there were restrictions. I do not know if that still exists, if the limitations have been lowered.
Another thing is that there needs to be a way to export from 3DS Max, various versions of Max, to XP format.
So those things need to be met.
I believe XP has exporters for Blender, which is nice. Many people are now building planes in Blender for FS. So exporting to XP format should be easy enough. Then animating the parts in the XP animation 'program' and then setting up the airfile data.
Oh.... You also have to build a true wind-tunnel model if I remember correctly. Your wings have to be proper spec airfoils. XP is a real-time aerodynamics engine, designed for testing airplane designs in real world aerodynamics, so that has to be met. I think I heard that they get around this by making a 'hidden' aerodynamics model that uses the air system, but you still need the hidden 'created' model for proper aerodynamics to work properly. In FS, we fill out the data for the wings and things and the computer/sim engine takes it from there. In XP, it must have a 3D design to fly through the sim 'air'.
It would be nice if it were easier to make things for XP.
I tried hanging out in the XP rooms back when XP10 was about to come out. If they found out you were from FS land, you were hit with the cold treatment and insults. I dont know what its like now. Hopefully a bit more friendly now.
Bill
LHC