 After a company @-@ wide contest to name the aircraft , the initial prototype received the name Pirate and made its first flight on 2 October 1946 . Flight testing revealed severe aerodynamic problems , mostly caused by the airfoil section and thickness of the wing . The vertical stabilizer also had to be redesigned to smooth out the airflow at the intersection of the horizontal and vertical stabilizers . Other changes included the addition of dive brakes on the sides of the fuselage and the replacement of the Metalite panels near the engine 's exhaust with stainless steel ones . 
