Firstly, a new generation of fire control system was installed, with brand-new NV00 1 passive phased array radar and vitrified cockpit, so that the Su -27SM could launch the R-77 missile (the original Su -27 did not have this capability, and the R-77 was designed with Su -30 and Su -35 instead of Su -27), thus greatly enhancing the over-the-horizon air combat capability.
Secondly, the installation of the new engine not only greatly improves the thrust (from 132 kN to 145 kN), but also is more advanced than the Al-3 1 used by the original Su -27 in terms of service life, failure rate and acceleration, giving the Su -27SM excellent maneuverability.
Furthermore, the application scope of airborne weapons has been expanded, and not only R-77 can be used, but also X-29 series, X-59 series (including the latest X-59MK) air-to-ground missiles, KAB-250/500 series precision guided bombs and X-4 1 anti-ship missiles can be loaded, thus greatly increasing the number of fighters.
Therefore, the Su -27SM has been thoroughly remoulded, and it is a real three-generation semi-fighter.
In contrast, J-1 1 is made in China by Su -27SK, and it is also a typical third-generation machine. 歼-1 1 All the main components of Su -27SK were replaced with domestic equipment, thus ensuring independent property rights. The improved J-1 1 has the ability to launch R-77 missiles, but due to the limitation of radar and fire control system, it does not have the powerful multi-purpose combat capability as Su -27SM.
It should be noted that J-1 1B is made in China, and there is no comparability between Su -30 and Su -27SM. Because Su -30MKK emphasizes air-to-ground attack, it sacrifices many superior performances of Su -27 in the process of improvement, and its air combat capability is not as good as J-1 1. The reason why China is still equipping J-1 1B in large quantities is that it is constantly equipping J-1 1.