The Lockheed XFV was an American experimental tailsitter prototype aircraft built by Lockheed in the early 1950s to demonstrate the operation of a vertical takeoff and landing (VTOL) fighter for protecting convoys.
Lockheed XFV
The first XFV-1 during a test flight at Edwards AFB
Vertical display of the XFV-1 Prototype at Florida Air Museum at Sun-n-Fun
The XFV-1 prototype located at Sun 'n Fun Museum, Lakeland, Florida
A tail-sitter, or tailsitter, is a type of VTOL aircraft that takes off and lands on its tail, then tilts horizontally for forward flight.
The Convair Pogo was one tailsitter design.