African or European?
Get yourself prepared for the questions of the Keeper of the Bridge of Death in this officially-licensed Monty Python shirt.
Aerodynamics was never our strong suit, so it's a good thing the Keeper of the Bridge of Death didn't ask us this question. We're going to rely on an old xkcd thread which says that this equation has to do with compressible subsonic flow and leave it at that. Fortunately, you don't have to know these things when you're the t-shirt girl. We just had to know that y'all needed this shirt. Basically, we got Lancelot's set of questions, and hopefully we didn't handle them like Galahad. Blue... no, yell... aaaaaaieeeeeeee!!!
Airspeed Velocity of an Unladen Swallow with an equation in white ink on a black, 100% cotton t-shirt.