This beautiful Ryan STA Special was manufactured in 1940. The "ST" stands for "Sport Trainer". It is a "Special" because it has a supercharged engine. The engine is a 150 hp Menasco C4S supercharged in-line inverted four-cylinder. Maximum speed at sea level is 160 mph. Tex "Outside Loop" Rankin won the International Acrobatic Championships in 1938 in a Ryan STA. Here is an excellent pilot report on the Ryan STA by Budd Davisson.