Consolidated PT-11 (Model 21)

The Consolidated Model 21 was a single-engine, two-seat training biplane of the early 1930s, developed as an aerodynamically refined successor to the PT-3 Husky. Its most distinctive feature was the substitution of rounded tail surfaces for the angular ones of earlier Consolidated trainers. Powered by a 220 hp Lycoming R-680 radial engine, the Model 21 served the U.S. Army Air Corps as the PT-11 primary trainer and was operated by the U.S.

Navy and Coast Guard under the designation N4Y. Built in modest numbers, it formed part of the family of dependable Consolidated trainers that bridged the gap between the wood-and-fabric machines of the 1920s and the more advanced trainers of the later 1930s. The type gave student pilots a stable, docile platform for primary instruction.