![](https://www.historynet.com/wp-content/uploads/2021/08/Vertol-VZ-2A-aircraft.jpg)
Unveiled on April 1, 1956, the Vertol VZ-2A was one of several experiments toward achieving VTOL flight by tilting wings, motors and rotors together. (U.S. Air & Space Museum, Smithsonian Institution)
U.S. Air & Space Museum, Smithsonian Institution