Apr 14
North American XB-70 Valkyrie, a retired prototype for a supersonic strategic bomber developed for the United States Air Force.
Top Speed: Capable of sustained flight at speeds over Mach 3 (2,000 mph2 comma 000 mph2,000 mph or 3,219 km/h3 comma 219 km/h3,219 km/h).
Altitude: Designed to cruise at altitudes exceeding 70,000 feet70 comma 000 feet70,000 feet (21,000 m21 comma 000 m21,000 m).
Technology: Utilized "compression lift," allowing the aircraft to ride its own shockwave for increased efficiency at high speeds.
Design: Featured six engines, a long delta wing, and movable wingtips that folded down to improve stability at supersonic speeds.
