The Convair XFY-1 Pogo was essentially an experiment in vertical takeoff and landing. The Pogo had a double three-blade contra-rotating propeller powered by a 5,500 hp. Allison YT40-A-6 turboprop engine. It was designed in hope for a high-performance fighter capable of operating from small warships. A weapon load of four 20-mm cannon or 46 x 70-mm Mighty Mouse unguided high-explosive rockets was proposed, but never fitted. Landing the XFY-1 was very tough, as the pilot had to look over his shoulder while carefully working the throttle to land. The Pogo's first transition from vertical to horizontal flight took place in November 1954.