When the air eventually exits the thin slit in the ring, it “sticks” to the sides due to the Coandă effect and produces a low pressure zone in the center. That’s all a fancy way of saying ...

This effect, named for a Romanian aircraft pioneer, has potential uses in such devices as burners and hovering vehicles ...

Worthy of note in this aircraft, however, are the over-wing engines, which produce the Coanda effect. In short, thanks to this, the power units increase the lift of An-72. The mentioned phenomenon ...