Verville-Sperry R-3
The Verville-Sperry R-3 was a cantilever wing racing monoplane with a streamlined fuselage and the second aircraft with fully retractable landing gear, the first being the Dayton-Wright RB-1. In 1961, the R-3 racer was identified as one of the "Twelve Most Significant Aircraft of all Time" by Popular Mechanics magazine.