Two-dimensional problems in hydrodynamics and aerodynamics by L. I. Sedov

By L. I. Sedov

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The VR-3 (Reys) tactical unmanned aerial reconnaissance system was exported to Czechoslovakia, Romania and Syria. The Syrians used it in actual combat in 1982 for reconnoitring Lebanese territory captured by 47 Top: A red-starred '143' (Tu-143) in the grey and red colours typical of the type sits where it has landed after a test flight in late autumn (judging by the scant snow cover). The clamshell doors of the recovery parachute bay immediately ahead of the fin are open and the landing gear oleos are fully compressed by the landing impact.

The forward fuselage (frames 3-9) serves as an avionics/equipment bay housing control system modules and electric equipment. The centre fuselage (frames 9-14) features the air intake. Its forward part accommodates the fuel tank (through which the S-shaped inlet duct passes), the fuel pump, the fuel accumulator, the G load protection device ensuring stable engine operation during manoeuvres and the hydraulic pump. The lower portion of Section F3 houses the rear aerial of the radio altimeter and Doppler speed/drift sensor (enclosed by a flush dielectric panel) and the electric power distribution panel.

Standing on its four short landing gear struts, the thing has a surreal look - 'an anteater from outer space'. ELlNT systems' frequency generators, which were very vulnerable to overheating), the DC generators and some control system and fuel system components against the strong kinetic heating in cruise flight; • develop an environmental control system capable of maintaining the required temperature, pressure and air humidity in the avionics/mission equipment bays with a higher degree of precision than the ECS of the '121' missile; • create a new precision navigation suite comprising an automatic flight control system (AFCS) enabling autonomous flight along a predesignated route and a compass system guiding the aircraft to the designated area where the reconnaissance equipment capsule is to be jettisoned and retrieved; • develop a long-range operations (LOROP) camera with a focal length of 1,000 mm (39% in) producing pictures making it possible to define such objects as railway tracks, trains and locomotives, small buildings and single vehicles (tanks, armoured personnel carriers and automobiles); • develop and verify an operational ideology for all stages of the system's operation and issue operating manuals for the system as a whole and its components for use by the first-line units.

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