The X3. I know, it sounds like something out of a James Bond movie, and it is, sort of. The Eurocopter X3 is a three-rotored experimental helicopter, designed to go FAST. It can fly faster than 220 knots (250 mph), whereas a standard helicopter tops out at around 150 knots. The X3 uses the additional two rotors to face forward and help propel the helicopter forward. Eurocopter says the X3 is designed for military use—but it won’t be long before other manufacturers catch on and begin implementing some of these design cues.