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Military production version of ST-3KR with Kinner R-540-1 engine; 1,048 built, including PT-22As.
The Ryan STs were a series of two seat, low-wing monoplane aircraft built by the Ryan Aeronautical Company. They were used as sport aircraft, as well as trainers by flying schools and the military of several countries.
More Photos from the California Capital Air Show
Canadian Aviation Blog