The XB-38 Flying Fortress was a single example conversion of a production B-17E Flying Fortress, testing whether the

Allison V-1710 The Allison V-1710 aircraft engine designed and produced by the Allison Engine Company was the only US-developed V-12 liquid-cooled engine to see service during World War II. Versions with a turbocharger gave excellent performance at high ...

V type engine could be substituted for the standard

Wright R-1820 The Wright R-1820 Cyclone 9 is an American radial engine developed by Curtiss-Wright, widely used on aircraft in the 1930s through 1950s. It was produced under license in France as the Hispano-Suiza 9V or Hispano-Wright 9V, and in the Soviet Un ...

radial engine during early

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...

Design and development

The XB-38 was the result of a modification project undertaken by

Vega Vega is the brightest star in the northern constellation of Lyra. It has the Bayer designation α Lyrae, which is Latinised to Alpha Lyrae and abbreviated Alpha Lyr or α Lyr. This star is relatively close at only from the Sun, a ...

(a subsidiary of Lockheed) on a

Boeing B-17 Flying Fortress The Boeing B-17 Flying Fortress is a four-engined heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC). Relatively fast and high-flying for a bomber of its era, the B-17 was used primarily in the European Thea ...

to fit it with liquid-cooled

-89

V-12 engines A V12 engine is a twelve- cylinder piston engine where two banks of six cylinders are arranged in a V configuration around a common crankshaft. V12 engines are more common than V10 engines. However, they are less common than V8 engines. The fi ...

. It was meant as an improved version of the B-17, and a variant that could be used if air-cooled

radial engine The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is ...

s 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 A prototype is an early sample, model, or release of a product built to test a concept or process. It is a term used in a variety of contexts, including semantics, design, electronics, and software programming. A prototype is generally used to ...

was built, and it was developed from an existing B-17 bomber. While the XB-38 delivered a substantially higher top speed, its service ceiling was lower. 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

Lockheed P-38 Lightning The Lockheed P-38 Lightning is an American single-seat, twin piston-engined fighter aircraft that was used during World War II. Developed for the United States Army Air Corps by the Lockheed Corporation, the P-38 incorporated a distinctive tw ...

Bell P-39 Airacobra The Bell P-39 Airacobra is a fighter produced by Bell Aircraft for the United States Army Air Forces during World War II. It was one of the principal American fighters in service when the United States entered combat. The P-39 was used by t ...

Curtiss P-40 Warhawk The Curtiss P-40 Warhawk is an American single-engined, single-seat, all-metal fighter and ground-attack aircraft that first flew in 1938. The P-40 design was a modification of the previous Curtiss P-36 Hawk which reduced development time an ...

, North American P-51A Mustang, and

Bell P-63 Kingcobra The Bell P-63 Kingcobra is an American fighter aircraft that was developed by Bell Aircraft during World War II. Based on the preceding Bell P-39 Airacobra, the P-63's design incorporated suggestions from P-39 pilots and was superior to its p ...

fighters.

Operators

; *

United States Army Air Forces The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...

Specifications (XB-38)

References

;Notes ;Bibliography * Francillon, René J. ''Lockheed Aircraft since 1913''. London:Putnam, 1982. . * Hess, William N. and Jim Winchester. ""Boeing B-17 Flying Fortress:Queen of the Skies". ''Wings Of Fame''. Volume 6. London:Aerospace Publishing, 1997. . ISSN 1361-2034. pp. 38–103. * Jones, Lloyd S. ''U.S. Bombers, B-1 1928 to B-1 1980s''. Fallbrook, CA: Aero Publishers, 1962, second edition 1974. .

External links

{{USAF bomber aircraft B-38 Flying Fortress Boeing B-38 Flying Fortress Four-engined tractor aircraft Low-wing aircraft B-38 Aircraft first flown in 1943 Four-engined piston aircraft

Design and development

Operators

Specifications (XB-38)

See also

References

External links