![]() The communications equipment is used for exchange of coded information during air combat as well as command guidance from the ground for intercepting air targets. The integrated navigation and communications systems, forming part of the avionics equipment, allow the Sukhoi Su-27SK to be navigated in all phases of its flight and landing approach in both automatic and director modes and provide radio communications with the ground control stations and other aircraft at distances of up to 1,500 km. The electronic and optronic countermeasures equipment makes it possible to detect a radiating source and determine its coordinates, classify the threat type and select the right countermeasures to jam the direction, range and speed channels and fire infrared and chaff decoys. The head-up display and the helmet-mounted target designator provide virtually instant inputs into the missile homing heads. The airborne radar operates in conjunction with the optronic aiming system which markedly improves target detection probability and target tracking reliability, especially in the ECM environment. The optronic aiming system, comprising infrared radar and a laser rangefinder, features a high- altitude effective range comparable with that of the airborne radar. The surveillance/aiming equipment, which is part of the weapon control system, assures radar-aided automatic all-aspect detection and tracking of up to ten aerial targets in free airspace at ranges of up to 120 km and against the earth background. The Russian fighter's avionics of Su-27SK offers an equal and, in some cases, better performance than similar European new-generation fighters. The avionics of the Su-27SK comprises an airborne radar, optronic fire control system, flight-navigation complex, ECM and communications facilities allowing the aircraft to perform its missions both during the day and at night, in all weathers and in the face of enemy ECM background. The required stability and controllability characteristics are assured by a quadruple-redundant remote control system. At subsonic speeds the Su-27SK is statically unstable in the longitudinal-control channel, which decreases trim losses. ![]() ![]() These fighter aircraft is built around an integrated conventional aerodynamic configuration, which makes it possible to achieve high aerodynamic lift and efficiency of air combat. The Su-27SK is intended to gain air superiority and deliver air attacks against ground targets by unguided weapons. Since then 30 years have elapsed and it would be interesting now to rate the machine from the viewpoint of the present-day standards, analyze the prospects for ideas which originated in the late 1960s and realized in the creation of the baseline aircraft and its version, the Su-27SK. Formally, the development program of the Su-27SK fighter, a version of the Su-27 aircraft, was launched in 1969, though the conceptual studies and work substantiating its higher performance at Air Force research institutes and in industry date back to a much earlier period. The Sukhoi Su-27SK is the export version of the basic variant of Su-27. ![]()
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