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Military


Tu-128 FIDDLER - Design

In June 1959, the customer was presented with a preliminary design, developed taking into account the results of blowing models in wind tunnels, as well as other experimental and calculated work performed by OKB brigades. The draft clearly formulated the capabilities of the Tu-28-80 complex in the country's air defense system. To increase its combat effectiveness, two K-80 missiles were equipped with semi-active radar homing heads (for attack from the front hemisphere), and the other two - with thermal homing heads (for attack from the back hemisphere, and also in conditions of radio interference).

According to preliminary calculations, the probability of hitting the target when firing two missiles was 76-77%. The peculiarity of the complex was that, in an air battle, the carrier aircraft did not maneuver to reach the flight altitude of the target, as was done in most other aircraft interception systems. The long range of K-80 missiles and the possibility of destroying objects flying with a significant excess allowed the carrier aircraft to fly at much lower altitudes. Thanks to this, a significant part of the maneuver was transferred from the interceptor to the missiles and the aircraft was calculated for operational overload in 2.0-2.5G, and the missile for overload at 15G.

Another feature of the complex was a large radius of action of the carrier aircraft. This made it possible to take the interception line to a distance of up to 1500 km, preventing the crossing of the country's borders by bombers or airplanes. In the waiting zone of the enemy's air forces, the interceptor could barrage 3-3.5 hours. Due to the long range of detection of the airborne radar it was not necessary to accurately bring the aircraft to the target with the help of a ground guidance system, it could intercept the target and independently. When autonomous actions required only some data on the position of air targets. This made it possible to apply it in areas where there were no automated guidance systems.

The designers did a lot of work on the aerodynamic and constructive layout of the interceptor, as a result of which it was possible to achieve good flight performance in supersonic and subsonic flight modes, during take-off and landing. To ensure high supersonic flight speeds and a prolonged time of barrage at a speed M = 0.85, a wing with a sweep of 56 with profiles of small relative thickness and a fuselage made according to the "rule of areas" was used. This arrangement of the aircraft ensured a sufficiently high aerodynamic quality at subsonic speeds (Kmax = 9.85) and an acceptable drag coefficient at supersonic speeds (Cx = 0.0365 at M = 1.5).

The complex of navigational and communication equipment on the carrier aircraft was almost the same as on long-range bombers, which ensured the possibility of intercepting the interceptor in the regions of the Far North and the Far East. For effective operation of the AL-7F-2 engines on all flight modes, the Tu-28 air intakes had movable two-point central bodies-cones. Good take-off and landing characteristics of the aircraft were provided by sliding slotted flaps, in addition, interceptors and a brake parachute were used for landing.

The structure of the power plant was a pair of turbojet engines AL-7F-2, which are placed inside the fuselage. In contrast to the basic Tu-22, the new interceptor was not equipped with an internal weapons bay. Armament was recorded on the pylons of the wings and the fuselage was used as a huge fuel tanks. A prototype of the Tu-28P design had the crew cabin that can accommodate two people.

Complex communication and navigation equipment, which was used on the Tu-128 was the same as that of the long-range bombers. This enabled loitering interceptor in the harsh climatic conditions of the Far East and the Far North. Effective operation of engine AL-7F-2 in various flight modes provide air intakes with movable bodies dvuhsachkovymi-cones. Advanced runways quality Tu-128 at the time were based on the activation of pull-slotted flaps and during the landing, except them, used as a brake parachute and spoilers.

The armament includes four aircraft missiles "air-to-air" P-4 / K-80, developed by KB Bisnovatyi. Typically, these were two missiles R-4R with semi-active radar guidance and fixed on the outer pylons and two R-4T, which were placed on the inner pylons and had infrared guidance. aircraft armament modernized in the 1960s, it was equipped with missiles R-4TM and P-4PM.

For this class of aircraft the crew included two people. The pilot was responsible for piloting the aircraft, the implementation of route guidance based on the command board RP-S radar, and the implementation of a missile launch. The navigator was the operator responsible for samoletovozhdenie throughout the flight, looking for air targets with the help of on-board radar, perform their recognition, capture, and was on the radio with the base airfield.

Before the advent of the Tu-128, fighters are rarely taken on board in the crew navigator-operator. But this model has shown a high level of efficiency of teamwork. Part of the navigation work fell on the shoulders of a specialist, while the pilot can focus on the main tasks: to intercept and defeat the purpose. Especially effective was the work of destruction after honing technology of aircraft in the forward hemisphere. Thus, it was possible to make sighting contact, lying at altitudes of 3.5-4 km below the target that was safer than firing at the same level.




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Page last modified: 09-02-2018 18:48:15 ZULU