A lomcevak is a Check term meaning headache.

It is a manuver where all the surfaces of the aircraft are completely stalled out. In essence, a good lomcevak will rotate the tail completely around the front of the aircraft.

It is a tumble manuver that starts in a 45 degree upline on knife edge. If the aircraft is on the left side, you would throw full down elevator, full right aileron, and full rudder at the same time, and watch it tumble.

Cool manuver, but full scale pilots hate it. It literally gives you a headache.

Brian