Vietnam used to pay off a large number of MiG-21Bis, this is the last version of the famous light fighter line MiG-21 produced by the Soviet Union. The combat capacity of the MiG-21Bis is comparable to that of the US F-16A / B light fighter. The birth of the MiG-21Bis was conceived by the Soviet Union in the late 1960s. In order to continue to improve the performance of the MiG-21 and Su-15 fighters, in winter 1971, the Soviet government issued a resolution of love. bridge The MKB Soyuz engine design department in Ufa built a new turbojet R-25-300 engine with a takeoff thrust of 7,100 kg, while in low flight with a sound speed of 9,900 kg. On the basis of the new engine, the MiG-21 fighter upgrade project officially began, this version was designated as MiG-21Bis. The production of the MiG-21Bis was deployed in that same year (1971) at the factory in Gorkiy city. In addition to the TRDF turbojet engine for the MiG-21Bis, the fuel system has been perfected, the reserve points found (mainly thanks to the auxiliary oil tank) have allowed for increased capacity. fuel system volume by nearly 239 liters, thus compensating for the long range loss due to increased fuel consumption. Recognizing the efforts of the MKB Soyuz engine manufacturers, they completed the mission. The R25-300 generates thrust in the emergency mode of 7,100 KG, while in accelerated first-grade 6,850 KG. Keeping the same size as the previous engine model, the engine’s dry weight increased slightly and did not exceed 1,215kg. In fact, the thrust capacity of the R25-300 engine has exceeded the initial requirements, thus helping the aircraft to have better maneuverability. Unfortunately, the MiG-21Bis’s fuselage has made full use of the space, including the exhaustion of the internal compartments, otherwise the power of the MiG-21Bis would be much stronger. The radar equipped for the MiG-21Bis, although not large in size, also significantly expanded the aircraft’s ability to capture the target. The aircraft is equipped with the RP-21 tadar; optical viewfinder ASP-PFD-21; The PNK Polyot-OI navigation-pilot combination helped the MiG-21Bis become an extremely powerful opponent in the air at that time. The MiG-21Bis retains the Lazur anti-interference communication channel, which ensures communication with the Vozdukh-1 ground-based automated command system. Pilots are equipped with a KM-1 or KM-1M parachute ejection seat, the PVD-18 air pressure receiver. With this equipment, the pilot can safely escape in case the aircraft is shot on fire. The maneuverability of the aircraft is close to that of the fourth generation fighter F-15, F-16 and Mirage 2000. The radar scattering area (RCS) of this aircraft is close to that of the aircraft. F-16 fighter aircraft. Compared with previous variants of MiG-21, MiG-21Bis fighter has improved wings, aircraft equipment is improved, significantly increasing the list of weapons. The MiG-21Bis’s armament load is about 1.3 tons, allowing up to four K-13M, RS-2US, R-3S, R-3R, R-60 and R- heat-range air-to-air missiles. 60M; or can carry 57 and 240mm rockets or 500kg free-fall bombs. Four mounting brackets can allow carrying “gun pods”, aviation cameras, and electronic radio reconnaissance facilities. In the fuselage is arranged a 23mm GSh-23L aviation gun with 200 rounds of ammunition. In 1972 the aerospace plant in the city of Gorkiy built the first 35 MiG-21bis interceptors, and in that same year the aircraft entered service. From 1972 to 1985, the Soviet Union built 2,013 MiG-21Bis with three main configurations: product “75” for the Air Force of the Soviet Air Defense Army (PVO); “75A” for socialist countries and “75B” for capitalist and developing countries. MiG-21Bis fighter entered Vietnam People’s Air Force in 1979. It could be the MiG-21bBs 75A version for the socialist bloc. Currently, all MiG-21Bis have been disqualified due to their expiry date.

To increase the range, the PrSM missile will be equipped with a new generation engine system, upgrading the navigation system without increasing the size of the missile.

US PrSM system.

The new propulsion system enables the missile to be launched from the foundation of existing US HIMARS jet artillery systems.

“When the INF Treaty is no longer in effect and medium-range missiles are no longer bound by range, we can increase the range of our weapons to complete missions,” the source said.

The Breaking Defense expert said that although the PrSM has increased its range by more than 3 times, this weapon still cannot compare with the Russian 9M729 missile – a weapon accused by the US of violating the INF while the treaty is in effect. .

The Russian 9M729 missile known as the SSC-8 has a maximum range of 5,500km. With such a range and complicated flight journey, Russia’s 9M729 missile is considered a threat to the US and to its European allies.

General John Hyten, of the US Strategic Command, admitted similarly in a testimony before Congress, saying that the new SSC-8 missile that Russia has deployed can defeat defense shields. US and European allies, especially when launched in large numbers.

It is known that 9M729 was developed and tested by Russia for many years, based on the missile version 9M728. The 9M729 is a ground-based version of the Kalibr-NK long-range ocean-based cruise missile complex, so it carries all of the basic tactical features of this missile.

9M729 is equipped with control and navigation system based on inertia with Doppler sensor that adjusts the attack angle according to the Glonass satellite navigation system and GPS. In the final stage, the self-guided missile radar will be activated, automatically finding and rushing to attack the target with a warhead weighing up to 450kg.

The missile is launched in a vertical position with the help of a solid fuel engine that increases the thrust after launch. The propeller-propeller jet engine then sends the missile thousands of kilometers to the target at subsonic flight speeds.

In terms of design, the 9M729 is built on a conventional aerodynamic principle with the wings folded in the body while moving. 9M729 can easily overcome enemy air defenses with complex flight journeys with many turns at very low altitudes.

The only difference that helps 9M729 assert its power compared to the Kalibr-NK version installed on the warships is the range. If Kalibr-NK has a maximum range of about 2,500 km, 9M729 can attack targets at distances of up to 5,400 km.

In particular, according to US intelligence sources, 9M729 is also developed by Russia with the ability to carry nuclear warheads. And this is one of the reasons that the US and its European allies are feverish with the 9M729 missile.