[2] He designed the Gee Bee Model Z racer, the "City of Springfield," which swept the competition in every contest in the National Air Races of 1931.
On September 5, Hall flew the Gee Bee Z to victory in the General Tire and Rubber Trophy race.
[3] Hall left the Granville Brothers in 1927 to form The Springfield Aircraft Co and moved operations to the Bowles Agawam Airport.
Robert Hall later joined Grumman, where he helped design and test a series of planes that proved a major force during World War II.
As Grumman's chief engineer and vice president, he was instrumental in the design of the F9F Panther, F9F Cougar, F10F Jaguar and F11F Tiger jet fighters and the Gulfstream I executive aircraft.