Red Bull Bo-105 Helicopter (Unusual Aircraft Collection)

As anyone who has seen the movie Blue Thunder can tell you, helicopters just aren't supposed to do loops!   This German-designed Bo-105 not only breaks that rule, it does all sorts of other aerobatic feats too, especially when flown on the airshow circuit as part of the Red Bull display team.

Although it's not a well-known helicopter in America, the Bo-105 has been very successful since it was certified in 1970.   Since then it has been exported to 20 different countries, where it's used for many civilian purposes as well as police and military operations.