Fairchild AT-21 Gunner

AT-21 Gunner
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Fairchild AT-21, USAF Photo
Type	Trainer
Manufacturer	Fairchild
Designed by	Armand Thiebolt
Maiden flight	1943
Introduced	1943
Retired	1944
Primary users	United States Army Air Corps United States Army Air Force
Number built	175
Developed from	Fairchild XAT-13, XAT-14, XAT-14A

The Fairchild AT-21 was an American World War II specialized bomber crew trainer, intended to train crews in the use of power gun turrets or a gun on a flexible mount, as well as learn to function as a member of a crew. It had a brief career as a training aircraft before modified bombers took over this role.

Design and development

The United States Army Air Corps (USAAC) laid out a specification for a specialized bomber trainer, ordering two prototypes from Fairchild Aircraft. The XAT-13 powered by two 450 hp (336 kW) Pratt & Whitney R-1340-AN-1 radial engines, emerged as a "scaled down" bomber with a single machine gun in the glazed nose and a top turret with twin machine guns and fitted with tricycle landing gear. The concept was to have a single type that was able to duplicate the bomber crew positions from piloting, navigation, bomb aiming/dropping to aerial gunnery.

The second prototype, designated the XAT-14 was similar in layout but was powered by two 520 hp (388 kW) Ranger V-770-6 inline engines. A further refinement to suit the aircraft for bombardier training with the nose gun and turret removed, led to a new designation, the XAT-14A. Both prototypes featured an unusual construction, being built from "Duramold" plastic-bonded plywood. At the end of the testing period, the USAAC ordered the inline version as the AT-21 Gunner, specialized for gunnery training. The AT-21 had a crew of five, pilot, co-pilot/gunnery instructor and three pupils.

Fairchild Aircraft Company built one aircraft in Hagerstown and 106 aircraft at their Burlington, North Carolina plant in 1943 and 1944, while Bellanca Aircraft built 39 at New Castle, Delaware, and McDonnell built 30 aircraft at their St. Louis plant, both companies were enlisted to speed production and delivery to training units.

Operational history

The AT-21 proved to be unsuitable for use as a trainer due to vibration and oscillation tendencies as well as an inherent instability caused by the short distance between the rudders and the gull wing resulting in unacceptable yaw even when slight rudder movements were made.

Not deemed suitable for its original purpose, The AT-21 was evaluated as an advanced pilot trainer. This did not work out well due to poor single engine performance and multiple gear problems. The aircraft was withdrawn from service in 1944 and was replaced by training examples of the actual aircraft in which the gunners would eventually serve. Many of the AT-21s were then relegated to target-tow duties.

A small number of AT-21s survived as civilian examples, with one (s/n 42-48053 owned by Craig Cantwell) still in existence in North Texas as a "basket case" awaiting restoration.

Variants

XAT-13

Twin-engined bomber crew trainer powered by two 450 hp (336 kW) Pratt & Whitney R-1340-AN-1 engines, one built, serial number 41-19500

XAT-14

AT-13 variant with two 520 hp ( 388 kW) Ranger V-770-6 engines, one built, later converted to XAT-14A, serial number 41-19503

XAT-14A

XAT-14 modified as a bombardier trainer with dorsal turret and nose gun removed.

AT-21

Production version of the XAT-14A with two 520 hp (388 kW) Ranger V-770-11 or -15 engines, 164 built.

XBQ-3

Guided bomb version, AT-21 modified with 4000 lb explosive charge in fuselage.

Operators

• Template:USA: US Army Air Corps, US Army Air Forces

Specifications (AT-21)

Data from The Complete Encyclopedia of World Aircraft

General characteristics

• Crew: 5
• Length: 38 ft (11.58 m)
• Wingspan: 52 ft 8 in (16.05 m)
• Height: 13 ft 1.25 in (4 m)
• Wing area: 378 ft² (35.12 m²)
• Empty weight: 8,654 lb (3,925 kg)
• Loaded weight: 12,500 lb (5,668 kg)
• Max takeoff weight: 11,288 lb (5,129 kg)
• Powerplant: 2× Ranger V-770-11/15 12 cylinder inverted-vee air-cooled piston engine, 520 hp (388 kW) each

Performance

• Never exceed speed: knots
• Maximum speed: 195.5 knots (225 mph, 362 km/h)
• Cruise speed: 170 knots (196 mph, (315 km/h))
• Range: 790.7 nm (910 mi, 1,464 km)
• Service ceiling: 22,151 ft (6,750 m)
• Rate of climb: 930 ft/min (283 m/min)

Armament

• one 0.3 in (7.62 mm) Browning trainable machine-gun in the nose
• two 0.3 in (7.62 mm) Browning machine guns in a power operated dorsal turret

References

Notes

Bibliography

• Andrade, John M. U.S. Military Aircraft Designations and Serials since 1909. Hinckley, England: Midland Counties Publications, 1979, ISBN 0-904597-22-9.
• Eden, Paul and Moeng, Soph, eds. The Complete Encyclopedia of World Aircraft. London: Amber Books Ltd., 2002. ISBN 0-7607-3432-1.
• Mondey, David. American Aircraft of World War II (Hamlyn Concise Guide). London: Bounty Books, 2006. ISBN 978-0-7537-1461-4.
• Swanborough, F. G. and Bowers, Peter M.United States Military Aircraft Since 1909. New York: Putnam, 1964. ISBN 0-85177-816-X.
• Taylor, Michael J.H. Jane's Encyclopedia of Aviation Vol. 3. London: Studio Editions, 1989. ISBN 0-517-10316-8.

External links

• Fairchild AT-21
• Fairchild AT-21 Gunner 1940

See also

Related lists
List of military aircraft of the United States

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Fairchild AT-21 Gunner".