Consolidated PT-11

The Consolidated Model 21 was an American two-seat training aircraft built by the Consolidated Aircraft Company and used by the United States Army Air Corps as the PT-11 and by the United States Coast Guard as the N4Y. It was an aerodynamically cleaned up version of the Model 12 or PT-3, with curved instead of angular tail surfaces, and was a single-engined biplane with a fixed tailwheel undercarriage and open cockpits for two. The XPT-933 prototype with a 170 hp Kinner engine first flew in February 1931, and a number of trial variants followed, among them the YPT-11 with a Continental engine, four of which were built, and the PT-11D with a 220 hp Lycoming radial. The type was not built in large numbers, and eleven Model 21-C aircraft were built in Canada as the 21-M for Mexico.