XB-38 Flying Fortress
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| XB-38 Flying Fortress | |
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| Type | Strategic bomber |
| Manufacturer | Boeing |
| Maiden flight | 19 May 1943 |
| Retired | 16 June 1943 |
| Status | Cancelled |
| Primary user | U.S. Army Air Force |
| Number built | 1 |
| Developed from | B-17 Flying Fortress |
The XB-38 Flying Fortress was a prototype United States bomber aircraft of World War II.
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[edit] Design and development
It was the result of a modification project undertaken by Boeing and Vega (a subsidiary of Lockheed) on a B-17 Flying Fortress to fit it with liquid-cooled Allison V-1710-89 inline engines. It was meant as an improved version of the B-17, and a variant that could be used if air-cooled Wright R-1820 radial engines became scarce. Completing the modifications took less than a year, and the XB-38 made its first flight on May 19 1943. Only one prototype was built, and it was developed from an existing B-17 bomber.
While the XB-38 delivered a slightly higher top speed, after a few flights it had to be grounded due to a problem with engine manifold joints leaking exhaust gases. Following the fixing of this problem, testing continued until the ninth flight on June 16 1943. During this flight, the third (right inboard) engine caught fire, and the crew was forced to bail out. The XB-38 was destroyed and the project was canceled, in part because the V-1710 engines were needed for other projects such as the P-38 Lightning, P-39 Airacobra, P-40 Warhawk, P-51A Mustang and P-63 Kingcobra fighter aircraft.
[edit] Operators
[edit] Specifications (XB-38)
General characteristics
- Crew: 10
- Length: 74 ft 4 in (22.7 m)
- Wingspan: 103 ft 10 in (31.6 m)
- Height: 19 ft 1 in (5.8 m)
- Wing area: 1527 ft² (141.9 m²)
- Empty weight: 54,900 lb (24,900 kg)
- Loaded weight: 62,134 lb (28,183 kg)
- Max takeoff weight: 64,000 lb (29,000 kg)
- Powerplant: 4× Allison V-1710-97 turbosupercharged liquid-cooled V12 engines, 1,425 hp (895 kW) each
Performance
- Maximum speed: 327 mph (526 km/h)
- Cruise speed: 226 mph (364 km/h)
- Range: 1,900 mi (3,100 km)
- Service ceiling 36,600 ft (11,200 m)
- Rate of climb: ft/min (m/s)
- Wing loading: 47.2 lb/ft² (231 kg/m²)
- Power/mass: 0.0655 hp/lb (0.110 kW/kg)
Armament
- Guns: 13× .50 in (12.7 mm) Browning M2 machine guns
- Bombs: 6,000 lb (2,700 kg)
[edit] See also
Related development
Related lists
[edit] References
[edit] Notes
[edit] Bibliography
- Jones, Lloyd S. U.S. Bombers, B-1 1928 to B-1 1980s. Fallbrook, CA: Aero Publishers, 1962, second edition 1974. ISBN 0-8168-9126-5.
[edit] External links
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