What you can see on these videos at the sommersault maneuver is the 90 degrees of climb position start. If you do the tower at the right, 70-80 degrees nose position, the aircraft will be fall forward, to the nose. However, if the nose position is 90 degrees, the airplane will be fall backward and it looks like a kulbit, or sommersault, but it will be just a ballistic movement. The risk of the flat spin, especially the negative flat spin is very high, due to the gyroscopic precession of the engines. It was a very lucky situation, managed by the Hungarian demo pilot at a demo training:
With a regular, 9.12 series MiG-29, especially at low level, the backward Tower (Bell, or Kolokol - in russian) is very dangeorus. Without the TVC, the basic rule is the asymmetric throttle handling, to prevent the spin by the precession of the engines. It is the right procedure for the regular Tower, however, for the non-regular one, at low level, you need a guardian angel help as well. The TVC MiG-29 OVT (there was just a single airframe under this designation and capability), or the Su-30MKI/MKA/MKM/SM, Su-35S, Su-57 is able to control this situation, like the F-22 and the non-TVC capable F-35 too. The two american-made fighters have counter rotating shafts, it is good for the less precession effect. But what will happen, if a similar-rotating engine, especially with a distance from the centerline is going to do a post-stall maneuvering and the precession filps the plane around the vertical axis? This is, when the double-kulbit went wrong and the pilot&TVC saves the day:
06 Dec 2022, 18:01
