When I was at the squadron level, I used to find videos for the cadets online for different aerospace stuff, then show them at meetings.
I figured that I hadn't looked around recently and found this....
it's a two-part:
http://www.youtube.com/watch?v=FdrrASk6dhU
http://www.youtube.com/watch?v=jrXfRB5PILs
It's not the prettiest thing in the world haha, very useful though.