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T. Claude Ryan was the founder of the Ryan Aeronautical Company, the second incarnation of a company with this name, and the fourth company with which he had been involved to bear his name[1] (the first, Ryan Airlines, was the manufacturer of the Ryan NYP, more famously known as the Spirit of St. Louis). He began the development of the ST (for "Sport Trainer", and also known as S-T), the first design of the company, in 1933.The ST sports aircraft had two open cockpits built in tandem, and an innovative steel-aluminium construction material, driven by a 95-horse power Menasco B4 engine.It was a series of two-seat low-wing monoplanes , used as sport aircraft and training aircraft. Initially known as the ST and ST-A, the military version was known as the PT-20. Later variants were the ST-B, ST-M and ST-3. Whit the Kinner radial engine installed it became the ST-3KR. The military version of the ST-3KR was designated PT-21 and PT-22.