The Gee Bee Q.E.D. Quod Erat Demonstrandum aka Gee Bee R-6H aka the Conquistidor del Cielo (Conqueror of Heaven) was the last in a series of racing and touring aircraft from the Granville Brothers. Unlike the other famous Gee Bee aircraft the Q.E. D had the distinction of never finishing a race it was entered in.
Made by GranvilleMiller & De LacknerGranville Brothers Aircraft.