1941 -- First flight of the Grumman XP - 50 land - based development of the shipboard F5 F - 1 Skyrocket fighter .
The Grumman XP - 50 is an American twin engine fighter prototype .
1941 -- First flight of the Grumman XP - 50 , an American twin engine fighter prototype , land - based development of the shipboard F5 F - 1 Skyrocket fighter .