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The Stearman XA-21 (Model X-100) was a competitor in a United States Army Air Corps competition for a twin-engined attack aircraft which (after redesigns) led to the Douglas A-20 Havoc, Martin A-22 Maryland and North American B-25 Mitchell.
| XA-21 | |
|---|---|
 | |
| Stearman XA-21 with streamlined cockpit | |
| Role | Ground attack |
| National origin | United States |
| Manufacturer | Stearman Aircraft |
| First flight | 1938 |
| Status | Prototype |
| Primary user | United States Army Air Corps |
| Number built | 1 |
Design and development
The X-100, designated XA-21 following purchase by the Army Air Corps, was a twin-engined high-winged monoplane of all-metal construction.[1] Its initial design featured an unusual "stepless cockpit" arrangement, much like those on most German World War II bombers designed during the war years from the He 111P onwards, with a streamlined, well-framed greenhouse canopy enclosing both the pilot and bombardier stations.[2]
Operational history
The XA-21 was first tested with the streamlined cockpit but this configuration was found to restrict the pilot's forward vision, and the aircraft was rebuilt with a conventional (stepped) nose and cockpit structure.[3] Although this change in the cockpit did not significantly affect performance, the XA-21 was not ordered into production.'[4]
The sole XA-21 had serial number 40-191.
Operators
United States
- United States Army Air Corps
Specifications (XA-21)
Data from Museum of the United States Air Force[4]
General characteristics
- Crew: 3
- Capacity: 5,560 lb (2,520 kg)
- Length: 53 ft 1 in (16.18 m)
- Wingspan: 65 ft 0 in (19.81 m)
- Height: 14 ft 2 in (4.32 m)
- Wing area: 607 sq ft (56.39 m2)
- Empty weight: 12,760 lb (5,789 kg)
- Gross weight: 18,230 lb (8,269 kg)
- Powerplant: 2 × Pratt & Whitney R-2180-7 Twin Hornet radial engines, 1,400 hp (1,030 kW) each
Performance
- Maximum speed: 223 kn (257 mph, 414 km/h)
- Cruise speed: 174 kn (200 mph, 322 km/h)
- Wing loading: 30.0 lb/sq ft (147 kg/m2)
- Power/mass: 0.15 hp/b (250 W/kg)
Armament
- Guns:
- 4× wing-mounted 0.30 in (7.62 mm) M1919 Browning machine guns
- 1× nose-mounted 0.30 in machine gun
- 4× aft-firing 0.30 in machine guns
- Bombs: 2,700 lb (1,200 kg)
See also
Related lists
- List of military aircraft of the United States
References
Notes
- "Stearman XA-21 (Stepped Cockpit)." Museum of the United States Air Force. Retrieved: 17 July 2017.
- Bowers 1989, p. 273.
- "Swift Attack Bombers Race For Jobs In Army Air Corps." Popular Mechanics, June 1939.
- "Stearman XA-21 (Streamlined Cockpit)." Museum of the United States Air Force. Retrieved: 17 July 2017.
Bibliography
- Bowers, Peter M. Boeing Aircraft since 1916. London: Putnam, Second edition, 1989. ISBN 0-85177-804-6.
- Wagner, Ray. American Combat Planes of the 20th Century, Third Enlarged Edition. New York: Doubleday, 1982. ISBN 978-0-930083-17-5.
External links
На других языках
[de] Stearman XA-21
Die Stearman Model XA-21 war ein zweimotoriges Flugzeug der Stearman Aircraft Corporation. Sie war einer der Kandidaten für eine Ausschreibung des United States Army Air Corps für einen zweimotorigen leichten Bomber, welche (nach Weiterentwicklung) zur A-20 Havoc, A-22 Maryland und B-25 Mitchell führte. Die ursprüngliche Bezeichnung bei Stearman war X100.- [en] Stearman XA-21
[fr] Stearman XA-21
Le Stearman XA-21 (modèle X-100) était un prototype d'avion d'attaque conçu par Stearman Aircraft pour l’Armée de l’air américaine. Il était concurrent dans le cadre d'une demande d'avion d'attaque bimoteur mais il ne fut pas retenu. Furent choisis à sa place le Douglas A-20 Havoc, le Martin Maryland et le North American B-25 Mitchell.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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