of the twin-engined pusher-prop airplane H.VII (an earlier glider had a mule engine). The Luftwaffe, however, did not actually use many of the Hortens' designs until 1942, but gave enthusiastic support to a twin-turbojet-powered fighter/bomber design, designated under Luftwaffe protocols as the Horten H.IX. For their completion of the three Ho 229 prototypes (V1, V2, V3), the Horten brothers were awarded 500,000 Reichsmark (approximately US$2–3 million in 2021 terms). Securing the allocation of turbojets was difficult in wartime Germany, as other projects carried higher priority due to their rank in the overall war effort. Although the turbojet-equipped Ho 229 V2 nearly reached a then-astonishing in trials, the production of the third prototype V3 was given over to the coachbuilder Gothaer Waggonfabrik, subsequently called Gotha Go 229. The Go 229 was captured by the U.S. Army at the end of World War 2, and the nearly complete V3 third prototype aircraft was shipped to the US to be studied. It is presently stored at the Smithsonian Institution in Washington, D.C. The Ho 229 had potential, but it was simply developed too late to see service. The Horten brothers also worked on the Horten H.XVIII, an intercontinental bomber that was part of the Amerikabomber project, and a prototype for a smaller version was ordered for the 1000 x 1000 x 1000 contest, for a bomber capable of flying at with bombs with a range. Among other advanced Horten designs of the 1940s was the supersonic delta-wing H.X, designed as a hybrid turbojet/rocket fighter with a top speed of Mach 1.4, but it was only tested in glider form as the Horten H.XIII. Post World War II As the war ended, Reimar Horten emigrated to Argentina after failed negotiations with the United Kingdom and China, where he continued designing and building gliders, including one experimental supersonic delta-wing aircraft and the four-engined flying wing FMA I.Ae 38 Naranjero, intended to carry oranges from producers to Buenos Aires. Walter remained in Germany after the war and became an officer in the post-war German Air Force. Reimar died on his ranch in Argentina in 1994, while Walter died in Germany in 1998. In the late 1940s, the personnel of Project Sign, the U.S. Air Force's flying saucer investigation, seriously considered the possibility that UFOs might have been secret aircraft manufactured by the U.S.S.R. based on the Hortens' designs. Aircraft Germany Horten H.I Horten H.II Habicht Horten