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The V-22 Osprey is one of the world’s most advanced airplanes. It has a cutting edge design using tilt rotor technology, which means that it has the ability to take off and land like a helicopter, and fly at high speeds like a plane. Designing a plane with two propellers that tilt vertically took many years of design and engineering to accomplish. The V-22 was not the first of its kind; however, it is the only plane of its kind to be produced. The vertical take-off and landing, or VTOL, concept is an old idea stemming from the German Luftwaffe at the end of World War II. Following the war, the U.S. Navy built two experimental VTOL aircraft, the Pogo and the Salmon. However, the programs were ended due to technical problems. In 1958, the U.S. Air Force developed the Bell XV-3, which was the first successful VTOL to hover, but was not tested in airplane flight. After the XV-3 program proved that the tilt-rotor concept was viable, Bell developed the XV-15 tilt-rotor that was tested by NASA. In July 1979, the XV-15 became the first aircraft to tilt from helicopter to airplane and back. It was also capable of traveling 346 miles per hour in airplane mode. The success of the tests lead to the expansion of the program, which was