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It could reach a top speed of 4,520 miles per hour (7,274 km/h), or Mach 6.72. During the X-15 program, 13 flights by eight pilots met the Air Force spaceflight criterion by exceeding the altitude of 50 miles (80 km), thus qualifying these pilots as being astronauts.
H155 (EC155 B1) - 324km/h. The H155 (formerly EC155 B1) helicopter from Airbus Helicopters has a maximum speed (VNE) of 324km/h and can fly at a fast cruise speed of 278km/h at an altitude of at 6,000ft. Efficient lift and the high top speed are attributed to its high efficiency profile.