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Consolidated Aircraft Corporation
/ Consolidated PT-11
The Consolidated Model 21 was an American two-seat training aircraft built by the Consolidated Aircraft Company.
It was used by the United States Army Air Corps with the designation PT-11 and the United States Coast Guard under the designation N4Y.
The Model 21 was an aerodynamic cleaned up version of the Model 12/PT-3, one of the distinguishing features being curved instead of angular tail surfaces.
The aircraft was a single engined biplane with fixed tailwheel landing gear and accommodation for two in open cockpits.
Designated the PT-11 by the United States Army Air Corps it progressed through a number of trial variants but was not built in large numbers.
11 Examples of the model 21-C were built in Canada as the 21-M for Mexico, none were built for local use.
Prototype powered by 170 hp (130 kW) Kinner engine, first flew February 1931.
Evaluation aircraft for US Army based on the Model 21A with a 165 hp (123 kW) Continental R-545-1 engine.
One YPT-11 was re-engine with a 175 hp (130 kW) Curtiss R-600-1 Challenger engine, originally as Y1PT-11A, later converted to PT-11C standard.
One YPT-11 was re-engine with a 210 hp (160 kW) Kinner YR-720-1 engine and designated Y1PT-11B.
5 production aircraft for US Army with another for the United States Coast Guard and designated N4Y-1.
PT-11A re-engine with a 180 hp (130 kW) Lycoming YR-680-1 engine.
One or two converted for US Army, with 18 new-build aircraft for Colombia.
Production version with 220 hp (160 kW) R-680-3 engine, originally designated Y1PT-11D.
A version of the PT-11 with a 300hp R-985-1 engine and detailed changes, later redesignated BT-7.
One YPT-11 was re-engine with a 300hp R-985-1
Redesignation of Y1BT-6.
PT-12 aircraft redesignated.
Evaluation aircraft for the United States Coast Guard, three built.
One YPT-11B for the USCG, later modified to the same standard as the XN4Y-1
26 ft 11 in (8.20 m)
31 ft 7 in (9.63 m)
9 ft 8 in (2.95 m)
280 sq ft (26.01 m2)
1,918 lb (870 kg)
Max take-off weight
2,585 lb (1,173 kg)
1 × Lycoming R-680A radial piston, 200 hp (149 kW)
118 mph (190 km/h, 103 kn)
13,700 ft (4,175 m).
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