Mikoyan MiG-29 Design

The Mikoyan MiG-29 is a fourth-generation jet fighter aircraft designed in the Soviet Union for an air superiority role. Developed in the 1970s by the Mikoyan design bureau, it entered service with the Soviet Air Force in 1983, and remains in use by the Russian Air Force as well as in many other nations. The NATO name "Fulcrum" was sometimes unofficially used by Soviet pilots in service. The MiG-29, along with the Sukhoi Su-27, was developed to counter new American fighters such as the McDonnell Douglas F-15 Eagle, and the General Dynamics F-16 Fighting Falcon.

Design

Features

Because it was developed from the same basic parameters laid out by TsAGI for the original PFI, the MiG-29 is aerodynamically broadly similar to the Sukhoi Su-27, but with some notable differences. It is built largely out of aluminium with some composite materials. It has a mid-mounted swept wing with blended leading-edge root extensions (LERXs) swept at around 40°. There are swept tailplanes and two vertical fins, mounted on booms outboard of the engines. Automatic slats are mounted on the leading edges of the wings; they are four-segment on early models and five-segment on some later variants. On the trailing edge, there are maneuvering flaps and wingtip ailerons. At the time of its deployment, it was one of the first jet fighters in service capable of executing the Pugachev Cobra maneuver.

The MiG-29 has hydraulic controls and a SAU-451 three-axis autopilot but, unlike the Su-27, no fly-by-wire control system. Nonetheless, it is very agile, with excellent instantaneous and sustained turn performance, high-alpha capability, and a general resistance to spins. The airframe is stressed for 9-g (88 m/s²) maneuvers. The controls have "soft" limiters to prevent the pilot from exceeding the g and alpha limits, but these can be disabled manually.

Powerplant

The MiG-29 has two widely spaced Klimov RD-33 turbofan engines, each rated at 50.0 kN (11,240 lbf) dry and 81.3 kN (18,277 lbf) in afterburner. The space between the engines generates lift, thereby reducing effective wing loading, to improve maneuverability. The engines are fed through wedge-type intakes fitted under the leading-edge extensions (LERXs), which have variable ramps to allow high-Mach speeds. As an adaptation to rough-field operations, the main air inlet can be closed completely and alter using the auxiliary air inlet on the upper fuselage for takeoff, landing and low-altitude flying, preventing ingestion of ground debris. Thereby the engines receive air through louvers on the LERXs which open automatically when intakes are closed. However the latest variant of the family, the MiG-35, eliminated these dorsal louvers, and adopted the mesh screens design in the main intakes, similar to those fitted to the Su-27.

Range and fuel system

The MiG-29 has a ferry range of 1,500 km without external fuel tanks, and 2,100 km with one external tank. The internal fuel capacity of the original MiG-29B is 4,365 litres distributed between six internal fuel tanks, four in the fuselage and one in each wing. The aircraft has range inline with the original Soviet requirements for a point-defense fighter.[citation needed] For longer flights, this can be supplemented by a 1,500-litre (330 Imp gal, 395 US gal) centreline drop tank and, on later production batches, two 1,150-litre (253 Imp gal, 300 US gal) underwing drop tanks. In addition, a small number have been fitted with port-side inflight refueling probes, allowing much longer flight times by using a probe-and-drogue system. Some MiG-29B airframes have been upgraded to the "Fatback" configuration (MiG-29 9–13), which adds a dorsal-mounted internal fuel tank. Advanced variants, such as the MiG-35, can be fitted with a conformal fuel tank on the dorsal spine, although none of them have yet entered service.

Cockpit

The cockpit features a conventional centre stick and left hand throttle controls. The pilot sits in a Zvezda K-36DM zero-zero ejection seat which has had impressive performance in emergency escapes. The cockpit has conventional dials, with a head-up display (HUD) and a Shchel-3UM helmet mounted display, but no HOTAS ("hands-on-throttle-and-stick") capability. Emphasis seems to have been placed on making the cockpit similar to the earlier MiG-23 and other Soviet aircraft for ease of conversion, rather than on ergonomics. Nonetheless, the MiG-29 does have substantially better visibility than most previous Russian jet fighters, thanks to a high-mounted bubble canopy. Upgraded models introduce "glass cockpits" with modern liquid-crystal (LCD) multi-function displays (MFDs) and true HOTAS.

Sensors

The baseline MiG-29B has a Phazotron RLPK-29 (Radiolokatsyonnui Pritselnui Kompleks) radar fire control system (FCS) which includes the N019 (Sapfir 29; NATO: 'Slot Back') look-down/shoot-down coherent pulse-Doppler radar and the Ts100.02-02 digital computer. Tracking range against a fighter-sized target was only about 70 km (38 nmi) in the frontal aspect and 35 km (19 nmi) in the rear aspect. Range against bomber-sized targets was roughly double. Ten targets could be displayed in search mode, but the radar had to lock onto a single target for semi-active homing (SARH). The MiG-29 was not able to reliably utilize the new Vympel R-27R (NATO: AA-10 "Alamo") long-range SARH missile at its maximum ranges.

These performance deficiencies stemmed largely from the fact the N019 radar was not, in fact, a new design. Instead, the system was a further development of the architecture already used in Phazotron's Sapfir-23ML system, then in use on the MiG-23ML. During the initial MiG-29 design specification period in the mid-1970s, Phazotron NIIR was tasked with producing a modern radar for the MiG-29. To speed development, Phazotron based its new design on the work undertaken by NPO Istok on the experimental "Soyuz" radar program. Accordingly, the N019 was originally intended to have a flat planar array antenna and full digital signal processing, giving a detection and tracking range of at least 100 km against a fighter-sized target. Given the state of Soviet avionics technology at the time, it was an ambitious goal. Testing and prototypes soon revealed this could not be attained in the required timeframe, at least not in a radar that would fit in the MiG-29's nose. Rather than design a completely new, albeit more modest radar, Phazotron reverted to a version of the twisted-polarization Cassegrain antenna used successfully on the Sapfir-23ML to save time and cost. This system used the same analog signal processors as their earlier designs, coupled with a NII Argon-designed Ts100 digital computer. While this decision provided a working radar system for the new fighter, it inherited all of the weak points of the earlier design. This reliance on 1960s-era technology continued to plague the MiG-29's ability to detect and track airborne targets at ranges available with the R-27 and R-77 missiles, although new designs like the digital N010 Zhuk-M address the serious signal processing shortcomings inherent in the analog design. Most MiG-29 continue to use the analog N019 or N019M radar, although VVS has indicated its desire to upgrade all existing MiG-29s to a fully digital system.

The N019 was further compromised by Phazotron designer Adolf Tolkachev’s betrayal of the radar to the CIA, for which he was executed in 1986. In response to all of these problems, the Soviets hastily developed a modified N019M Topaz radar for the upgraded MiG-29S aircraft. However, VVS was reportedly still not satisfied with the performance of the system and demanded another upgrade. The latest upgraded aircraft offered the N010 Zhuk-M, which has a planar array antenna rather than a dish, improving range, and a much superior processing ability, with multiple-target engagement capability and compatibility with the Vympel R-77 (or RVV-AE) (NATO: AA-12 'Adder'). A useful feature the MiG-29 shares with the Su-27 is the S-31E2 KOLS, a combined laser rangefinder and IRST in an "eyeball" mount forward of the cockpit canopy. This can be slaved to the radar or used independently, and provides exceptional gun-laying accuracy.

Armament

Armament for the MiG-29 includes a single GSh-30-1 30 mm cannon in the port wing root. This originally had a 150-round magazine, which was reduced to 100 rounds in later variants. Original production MiG-29B aircraft cannot fire the cannon when carrying a centerline fuel tank as it blocks the shell ejection port. This issue was corrected in the MiG-29S and later versions. Three pylons are provided under each wing (four in some variants), for a total of six (or eight). The inboard pylons can carry either a 1,150 litre (300 US gal) fuel tank, one Vympel R-27 (AA-10 "Alamo") medium-range air-to-air missile, or unguided bombs or rockets. Some Soviet aircraft could carry a single nuclear bomb on the port inboard station. The outer pylons usually carry R-73 (AA-11 "Archer") dogfight missiles, although some users still retain the older R-60 (AA-8 "Aphid"). A single 1,500-litre (400 US gal) tank can be fitted to the centerline, between the engines, for ferry flights, but this position is not used for combat stores. The original MiG-29B can carry general-purpose bombs and unguided rocket pods, but not precision-guided munitions. Upgraded models have provision for laser-guided and electro-optical bombs, as well as air-to-surface missiles.

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