Here is a very good forum to check out. If you have any quesitons about aerodynmics, this forum is very active:
Aerodynamic Engineering
http://www.eng-tips.com/threadminder.cfm?pid=1
Aircraft Engineering
http://www.eng-tips.com/threadminder.cfm?pid=2
Not sure why there is a distinction, but there are 2 different ones.