Flight
The first lesson looks like a Space unit activity, but it isn't.
AIR FOIL RESEARCH
These are a series of videos that may help you with your design. You do not need to watch all of them, or even the entire video.
Airfoil Design
Actual video footage of wing during a stall - strings on the wing
Simulators:
Brainpop Hot Air Balloon Simulator
CK-12 hot air balloon simulator
WindTunnel (on iPad)
Wright Brother's Kitty Hawk Design Challenge
Mr. Reiter's weight of air calculator
Tumblewing surfing