If your aircraft shows up 'white' then it probably didn't load the textures on to it. Most of the times this happens when you don't tell the sim where to look for the folder with the textures. Assuming that you've added all the appropriate lines in your aircraft.cfg and gave the new aircraft a new number, it sounds to me like you didn't add the 'texture= ....' correctly. Inside your Cherokee's main folder there are different folders for all the different repaints, each one having a different name. Now, lets say that your new repaint folder is called texture.harold then you need to reference to that folder in your aircraft.cfg. so the 'new aircraft' should have a reference to the new repaint like this: texture=harold.
Hopefully this clears things up
