turbojet engines in place of the turboprops on a similar wing platform, but with a thicker root section. Work on detailed engineering and mockup construction was canceled, although Boeing was contracted to continue conceptual studies and wind tunnel investigations. These studies proved valuable in development of the Boeing B-52 Stratofortress, which first flew on April 15, 1952. The XB-55 project did not result in construction of a prototype. Specifications (Estimated) See also References Citations Bibliography Bowers, Peter M. Boeing Aircraft Since 1916. London: Putnam, 1989. . Butler, Tony (2010). American Secret Projects. Hinckley, England: Midland Publishing. . Jones, Lloyd S. U.S. Bombers, B-1 1928 to B-1 1980s. Fallbrook, CA: Aero Publishers, 1962, second edition 1974. . B-55 Four-engined tractor aircraft Aircraft with contra-rotating propellers Cancelled military aircraft projects of the United States Four-engined turboprop aircraft High-wing aircraft Bomber aircraft