Wind tunnel testing used to understand the unsteady side of aerodynamics

Think about a time you've been a passenger in a car and stuck your hand out the window. As your speed increases, so do the vibrations in your hand. Trying to keep those fingers steady as the wind whips around them at 75 mph gets pretty tricky, right?

Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/v...