Consolidated PT-11

PT-11

Consolidated Y1PT-11
Role	Primary trainer
Manufacturer	Consolidated Aircraft Company, Fleet Aircraft
Introduction	1931
Primary users	United States Army Air Corps United States Coast Guard
Number built	41^[1]^[2]

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

Design and development

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.

Operational history

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 but none were built for local use.

Variants

XPT-933: (Model 21A). Prototype powered by 170 hp (130 kW) Kinner engine, first flew February 1931.^[3]
YPT-11: Evaluation aircraft for US Army based on the Model 21A with a 165 hp (123 kW) Continental R-545-1 engine, four built.^[3]
PT-11A: One YPT-11 was re-engined with a 175 hp (130 kW) Curtiss R-600-1 Challenger engine, originally as Y1PT-11A, later converted to PT-11C standard.^[3]
Y1PT-11B: One YPT-11 was re-engined 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.^[4]
PT-11C: PT-11A re-engined 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.^[5]
PT-11D: Production version with 220 hp (160 kW) R-680-3 engine, originally designated Y1PT-11D. 21 new-built, plus five conversions from Y1PT11-Bs and two from Y1PT-11s.^[5]
PT-12: A version of the PT-11 with a 300hp R-985-1 engine and detailed changes, ten built later redesignated BT-7.

Y1BT-6

Y1BT-6: One YPT-11 was re-engined with a 300hp R-985-1
BT-6: Redesignation of Y1BT-6.

BT-7

BT-7: PT-12 aircraft redesignated.
XN4Y-1: Evaluation aircraft for the United States Coast Guard, three built.
N4Y-1: One YPT-11B for the USCG, later modified to the same standard as the XN4Y-1

Operators

United States

Colombia

Colombian Air Force (PT-11C).

Paraguay

Paraguayan Air Arm (Model 21-C).

Mexico

Mexican Air Force (Model 21-M).

Specifications (PT-11D)

Data from "The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985)" Orbis Publishing

General characteristics

Crew: two
Length: 26 ft 11 in (8.20 m)
Wingspan: 31 ft 7 in (9.63 m)
Height: 9 ft 8 in (2.95 m)
Wing area: 280 ft² (26.01 m²)
Empty weight: 1,918 lb (870 kg)
Max. takeoff weight: 2,585 lb (1173 kg)
Powerplant: 1 × Lycoming R-680A radial piston, 200 hp (149 kW)

Performance

Maximum speed: 118 mph (190 km/h)
Service ceiling: 13,700 ft (4175 m)

References

Wikimedia Commons has media related to Consolidated PT-11.

↑ "U.S. Army Aircraft 1908-1946" by James C. Fahey, 1946, 64pp.
↑ http://aerofiles.com/_fleet.html
1 2 3 Wegg 1990, p. 64.
↑ Wegg 1990, p. 65.
1 2 Wegg 1990, pp. 64–65.

The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.
Wegg, John (1990). General Dynamics Aircraft and their Predecessors. London: Putnam Aeronautical Books. ISBN 0-85177-833-X.

United States trainer aircraft designations, Army/Air Force and Tri-Service systems

Advanced Trainer
(1925-1948)

Basic Combat
(1936-1940)

Basic Trainer
(1930-1948)

Primary Trainer
(1924-1948)

Main sequence
(1948-present)

1948 redesignations	T-6 T-7 T-11 T-13A T-13B/D T-17 T-19

New designations	T-28 T-29 T-30 T-31 T-32 T-33 T-34 T-35 T-36 T-37 T-38 T-39 T-40 T-41 T-42 T-43 T-44 T-45 T-46 T-47 T-48 (I) T-48 (II) CT-49 T-50 T-51 T-52 T-53

Alternate sequences

1962 redesignations	T-1 T-2

1990-1996 sequence	T-1 T-2¹ T-3 T-4¹ T-5¹ T-6

¹ Not assigned

USN/USMC trainer aircraft designations 1922-1948

Boeing	NB N2B

Curtiss	NC¹ N2C

Piper	NE

Huff-Daland	HN

Howard	NH

North American	NJ

Keystone	NK

Langley	NL

Martin	NM¹ N2M

Naval Aircraft Factory	NN¹ N2N N3N N4N¹ XN5N

Spartan	NP

Fairchild	NQ

Ryan	NR

Stearman	NS N2S

New Standard	NT

Timm	NT² N2T

Consolidated	NY N2Y N3Y N4Y

¹ Not assigned ² Assigned to a different manufacturer's type

Aircraft produced by Consolidated Aircraft

Manufacturer designation	1 2 7 8 9 10 14 15 16 17 18 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 36 37 39 40

By role	Trainers NY PT-1 PT-2 PT-11 AT-22 Observation aircraft O-17 Fighter P-30 Patrol PY P2Y P3Y XP4Y-1/P4Y-2 PBY PB2Y XPB3Y PB4Y-1/-2 Bombers X/B-24 B-32 XB-41 B-36 BY XB2Y LB-30A/B Liberator B.I Liberator GR.I Transports C-11 C-22 C-87 XC-99 C-109 RY R2Y Liberator C.IX Reconnaissance F-7

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