In the early 1980s a programme was commenced in Moscow to develop a high performance aerobatic aircraft for competition.

The Waiex is a variant of the Sonex series of light all-metal aircraft and the main variation from the Sonex is a V-tail.

The ASK 21 is a two-seat mid-wing glider with a T-tail designed for instruction but also aimed at the market for cross-country performance and aerobatics.