Kammala jumla mai zuwa: An fara a 1939, shirye-shiryen sun isa sosai har an gudanar da gwaje-gwaje tare da babban makami da kuma kariya ta karkashin ruwa. Ko da yake an yarda da jiragen ruwa don ginawa a karkashin shirin 1942 na sake gina jirgi, da fifiko ga masu jigilar jiragen sama da ƙananan jiragen ruwa saboda yakin, sannan kuma
Rashin nasarar Japan, ya kashe duk wata dama ta gina B-65.