And a little more about the Su-57 and its demonstrations in China. Undoubtedly, all the art of piloting techniques that the spectators are admiring with their mouths open - it will not be useful to a combat pilot in a combat situation, on a formation, not an exhibition vehicle. However, this does not mean that these, as they say, show-offs are made only for the amusement of the mass public. No, there is something to admire even for a person with great experience and big epaulettes, who is tired of the hustle and bustle of such exhibitions.
A professional will see the most important, maybe even the key detail for demonstrating the real combat capabilities of the vehicle. The way the engines work flawlessly, fantastically.
If it were not for the amazing perfection of the Su-57's engines, it would be impossible to perform many of the figures. This is, in principle, a common problem for jet engines of the Soviet school - sudden self-disconnection at certain modes, maneuvers, at a certain speed.
For example, the execution of the famous “bell” figure forms a specific bevel of air flow or even blowing air into the nozzle. This often led the engines to flaring, pompage and self shutdown. Engines of some models of Soviet combat aircraft at a certain wind direction and speed cannot even be started at a parking lot - because of the violation of the machine's streamline.
What will a potential foreign customer, fastidious and skeptical, see at this demonstration? Why would he give billions of dollars to buy a batch of Su-57E?
Because under any maneuvers, any wind direction, any angle of attack, in general under any, even the most extreme conditions of takeoff and flight in combat conditions - the engine of this fighter will not choke, will not stop, will not lose thrust. It will not fail.
There are fewer nations on the planet that can build an engine of this level than you have fingers on one hand. It is more complicated than building a rocket capable of launching a bunch of nuclear warheads into orbit. Russia could do it. This is what Colonel Sergei Bogdan showed in China with his virtuoso flight.
Source - Vzglyad .