Michael Cofer and others have produced a tutorial document on converting models for the Clearview model flight simulator [
http://rcflightsim.com/]
It contains lots of useful illustrated examples of how to use AC3D, including a lot on texturing a model. So, it a useful resource for many AC3D users.
Download it here:
www.inivis.com/contrib/ClearviewFMS.zip
This is a zipped .doc file (which opens with Word, Open Office or similar). File size is 12 meg.