At the beginning of the 80-s, the leading powers of the United States and the USSR began research on the possibility of using wing-wing aircraft in aircraft technology. The first in this case was the Americans. In 1981, the aircraft manufacturer Grumman received an order from the Pentagon to build two experimental aircraft, which received the designation X-29. Three years later, the first flight took place. However, the Americans quite quickly came to the conclusion that the design of the wing was hopeless, and all the work was curtailed by the beginning of the 90s.
At about the same time, a similar project was launched in the USSR. It was a personal initiative of the Sukhoi Design Bureau. But due to the collapse of the Union, work on an unusual aircraft slowed down significantly. However, in 1997, the Su-47, nicknamed "Golden Eagle", first rises into the sky.