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Boeing XB-38 Flying Fortress

Heavy bomber aircraft
The XB-38 Flying Fortress was a single example conversion of a production B-17E Flying Fortress, testing whether the Allison V-1710 V type engine could be substituted for the standard Wright R-1820 radial engine during early World War II. Wikipedia
Retired: June 16, 1943
Top speed: 327 mph
Engine type: Allison V-1710
Range: 3,299 mi
Wingspan: 104′ 0″
First flight: May 19, 1943
Cruise speed: 226 mph