Yak-41 (Jet fighter plane)

found: Work cat.: Gordon, Y. Yakovlev Yak-36, Yak-38 & Yak-41 : the Soviet "jump jets", c2008:p. 101 (Yak-41 experimental supersonic VTOL fighter) p. 121 (... the bogus designation Yak-141 came into being)

found: Wikipedia, 15 Sept. 2008(the Yakovlev Yak-141, NATO reporting name "Freestyle", was a supersonic VTOL fighter aircraft from the Soviet Union; the Yak-141, the development prototype of the Yak-41; the program was initiated in 1975 as the Yak-141, a development of the Yakovlev Yak-38; the first conventional flight of the Yak-41 was in 1987 and the first hovering flight in 1989; in 1991 the program was stopped)

found: Virtual Aircraft Museum website, 15 Sept. 2008(Yakovlev Yak-141; VSTOL fighter)