sentences:  The development version, the Vought XF5U-1, was a larger aircraft with all-metal construction, and was almost five times heavier.The first flight of the V-173 was on 23 November 1942 with Vought Chief Test Pilot Boone Guyton at the controls.The aircraft's most significant problem concerned its complicated gearbox that routed power from the engines to its two long propeller shafts.