Question: The designers of the Horten H.XVIII also designed the world's first jet-powered flying wing known by what name?
Related documents: [0]  [DOC] Walter Horten (born 13 November 1913; died 9 December 1998 in Baden-Baden, Germany) and Reimar Horten (born 12 March 1915; died 14 March 1994 in Villa General Belgrano, Argentina), sometimes credited as the Horten Brothers, were German aircraft pilots and enthusiasts. Although they had little, if any, formal training in aeronautics or related fields, the Hortens designed some of the most revolutionary aircraft of the 1940s, including the world's first jet-powered flying wing, the Horten Ho 229. [END] 
[1]  [DOC] The Horten H.XVIII was a proposed German World War II intercontinental bomber, designed by the Horten brothers with pioneering features such as a flying wing configuration, turbojet engines and stealth characteristics. The unbuilt H.XVIII represented, in many respects, a scaled-up version of the Horten Ho 229, a prototype jet fighter. The H.XVIII was one of many proposed designs for an "Amerika Bomber", and would have carried sufficient fuel for transatlantic flights. [END] 
Answer: 
Horten Ho 229
Horten Ho 229