[Reports] / Amer.inst.of aeronautics and astronautics. N 90-3207 : bell X-22 V-STOL variable stability research airplane-lessons learned : Rep.presented at the AIAA/AHS/ASEE aircraft design,systems and operations conf.,Sept.17-19 1990,Dayton(Oh) / J.Bielman, 1990. - 18 p. - Текст : непосредственный.