Air Force General Popov told how the Su-75 fighter will be arranged
The newest Russian Su-75 Checkmate fighter can be equipped with an engine with an all-angle rotary jet nozzle, according to the text of the patent published by the Federal Service for Intellectual Property. "Newspaper.Ru" figured out how such a nozzle increases the combat capabilities of the aircraft.
"The rotary jet nozzle of the aircraft engine is located along the axis of symmetry of the fuselage and is used for control and balancing in flight, can be performed as deflected only up and down in the vertical plane, and all-angle," the document says.
Earlier, the head of the United Aircraft Corporation (UAC), Yuri Slyusar, said that Checkmate will receive the Product 117 engine (AL-41F1), which will be modified for a single-engine aircraft. Slyusar also said that the first flight of Checkmate is planned in 2023, serial production - in 2026.
The document of the Federal Service for Intellectual Property also reports that the Checkmate model was tested in wind tunnels.
"The presence of all the above controls in the design of the aircraft together make it possible to move away the zones of occurrence of unbalanced static instability of the aircraft, increase the load-bearing properties and reduce the resistance of this aerodynamic layout of the aircraft, which is confirmed by calculations and tests of the model in wind tunnels," the document says.
Checkmate was developed by Sukhoi, which is part of the UAC, it was first presented at the MAKS-2021 air show, its foreign presentation took place at the Dubai Airshow 2021 in the UAE.
"Engines with a rotary jet nozzle are installed on Russian generation 4++ MiG-35, Su-30SM, Su-35, Su-37 aircraft. Such an engine increases the maneuverability of the aircraft at low speeds - it gives super maneuverability. Rotary nozzles are the hobby of Russian engine builders. It is thanks to this technical solution that we see at various world air shows how our large strike aircraft do not just perform aerobatics, but literally hang in the air, do such somersaults that foreign aircraft cannot repeat," he told the newspaper.Ru" aviaexpert, editor-in-chief of the portal Avia.Ru Roman Gusarov.
The expert noted that the engines of foreign aircraft do not have rotary nozzles.
According to Vladimir Popov, retired Major General of the Air Force, former head of the Federal Directorate of Aerospace Search and Rescue under the Ministry of Defense, an engine with a rotary jet nozzle is an engine with a variable thrust vector in which the axis of the output nozzle can change both up and down by 15-20 degrees, and left and right by 8-10 degrees.
"The bottom line is that the controllability of the thrust is changing and this makes it possible to increase the degree of maneuverability of the aircraft. The safety of its piloting also increases. An aircraft with such an engine will be more agile, mobile in the air, which is very important for air combat - the aircraft will dodge enemy missiles more effectively, its survival rate will increase, and therefore the probability of performing a combat mission," Popov explained.
He noted that if the 4++ generation aircraft have engines with an oval-shaped rotary jet nozzle, then an engine with a rectangular nozzle will probably be offered for Checkmate.
"A rectangular nozzle, in addition to increased maneuverability, will give a low visibility of the aircraft in radar terms - it will increase the scattering coefficient of reflected rays. The same thing will happen in the infrared beam - such a nozzle will allow for greater dispersion of exhaust gases in the air mass. They come out of the nozzle with a high temperature - 400-500 degrees.
Popov said.
According to him, this increases the enemy's reaction time and, accordingly, the time to make a decision for the Checkmate pilot.
Irina Alshayeva
