ye-152 flipper
A short series of prototype Soviet jet interceptor aircraft built by the Mikoyan-Gurevich aircraft bureau in 1959. Although one of them, the Ye-152A, received the NATO reporting name Flipper after appearing in a military airshow in 1961, no Ye-152 (nor any other member of the Ye-150 family) ever went into production. Only one Ye-152A was ever built, and it was only used for testing. It crashed in 1965.