AEW helicopter — the Ka-31

The Ka-31 (article 503, NATO reporting name Helix-B) — radar picket helicopter designed for the needs of the Navy. Helicopter remote radar was developed on the basis of the existing vehicular transport and combat helicopters Ka-29. The helicopter can be based both on the ships of different classes as well as on land. Homebase for the Ka-31 can perform all the ships that can take on your own board helicopters Ka-27 and Ka-29. The helicopter can be used in overland option for solving problems of air defense of ground troops. At present, this helicopter has no global counterparts.

The helicopter is in service with the Russian Navy by 2012 disk imaging fleet is in service with two of the helicopter. Also, the Ka-31 is exported and is in service with the Marine Aviation in India and China. India has nine helicopters of this class, with all this in 2009 was contracted to supply a further 5 of these helicopters (the price of the helicopter about 20 million dollars per unit). In service with the Marine Aviation Administration of China in 2012 and were 9 Ka-31 helicopters.

AEW helicopter Ka-31 is designed for radar monitoring of air and sea space of early detection of distant frontiers of low-flying targets such as cruise missile, helicopter, aircraft, surface ships, and also their identification. Helicopter able to determine the characteristics of the path of the target coordinates and transferring information about the observed radar and air conditions on the ships and command centers of the Army.

AEW helicopter - the Ka-31

The Ka-31 is formed by coaxial helical pattern. The carrier system and propulsion machinery were taken from the transport-combat helicopter Ka-29. Configuration of its design were dictated by the need to install underneath the helicopter radar antenna, which at the time of the flight is pivotable on a special link device and its working vertical position. The scale mirrors the radar antenna installed on the Ka-31, is 6 meters. In the stowed position, this antenna is pressed against the bottom of the body of the helicopter and fixed.

To ensure the entry and exit on the starboard crew transport helicopter cockpit door was fitted. The sides of the cockpit instead of conventional sliding doors were installed emergency hatches with sliding glazed doors that own emergency release system. The helicopter had Four chassis, with all this wheel bearings were cleaned in special fairings, which were placed on the outside edges of the fuselage of the helicopter. The main landing gear podymali upward, making space for rotating radar antenna in flight. Main rotor blades are made of plastics and composite materials and provided with an electrothermal deicing system.

Creation story and features

Need for funds AWACS sea was demonstrated during the Anglo-Argentine conflict over the disputed Falkland Islands. Due to the absence of the British Expeditionary Force AWACS aircraft or helicopters they could not just search, discovery, and following the interception of low-flying Argentine jets. The use of this as destroyers ended unsuccessfully for the British — the loss of 2 of these ships ("Coventry" and "Sheffield").

AEW helicopter - the Ka-31

In view of this military conflict in 1985, the OKB. NI Kamov given the task to create a helicopter AWACS. In the development of Ka-31 was to take over the base airframe, engine and rotor system has already produced transport-combat helicopter Ka-29. The main difficulty in developing it was a strong radar in conjunction with the rest of helicopter flight and navigation equipment, ensuring the stability of the helicopter in the air while rotating radar antenna. Own the first flight of the prototype of a new model helicopter made in 1987. After a series of pretty much testing, the car in 1995 was adopted by the naval aviation of the Russian Navy. The ready-scale helicopter was conducted in a factory located in the town of Kumertau.

The Ka-31 was designed to detect air targets, and surface ships and their escorts. Ship-based helicopter is designed to provide air defense combat units of the fleet, which operate outside the acts AWACS aircraft and shore based radar. This helicopter is unique in the world helicopter. Its on-board database of the complex is quite a powerful radar on solid-state elements, which for the operation mode of the radial angle is manufactured in-flight antenna with a flat phased array (PAR). In the stowed position antenna located just under the bottom of the fuselage.

Mounted on a helicopter onboard electronic system allows the Ka-31 to keep automatic flight in advance programmed route in all weather and weather criteria. AWACS radar allows the helicopter to immediately detect and automatically accompany up to 20 targets.

AEW helicopter - the Ka-31

Information all found to automatically encoded information is transmitted over a communication channel at different control points. On the Ka-31 is a distant radar detection system "Oko" (E-801), made in the Nizhny Novgorod Research Institute of Radio Engineering. During the flight it everyday tight to the bottom of the fuselage machine, creating with all this little drag. When transferring the antenna into position she deflected downward by 90 degrees, with all this little helicopter landing gear are rising up, in order to prevent the chassis is not working radar in rotation mode. Phased-array radar weighs 200 kg, the area of the antenna is 6 m. meters and the length is 5.75 m. The antenna is able to provide the detection and the next support 20 ends. The objectives of the class "fighter" is found at a distance of 100-150 km, and surface targets of class "ship" found at a distance of 250-285 km.

Helicopter The Ka-31 is equipped with flight control and navigation system (NCP) developed by Instrument Design Bureau in the town of Saratov. At a time when the radar antenna is released, the operating position, the PNA helicopter provides stabilization of the angular positions, as this or barometric altitude, flying patrol in the area on typical trajectories, automatic printing machine at the airport or ship, The conclusion to the point landing, with landing radar signals. Available in a helicopter remote radio system navigation allows for continuous reading of geographical coordinates of the Ka-31 (latitude and longitude), and automatic vertoletovozhdenie by early programmed route with the next return to the point of their own home.

To transfer the purchased disk imaging on the tactical situation on the open and closed channels of communication telecode helicopter Ka-31 AEW & C has a specific set of communications. At an altitude of 1500-3000 meters on the level of transmission telecode disk imaging from aircraft is likely to more than 150 km. With all of this automatic check flight characteristics is done using special equipment of magnetic recording "Tester-3K."

The Ka-31 of the Indian Navy

In the case of the introduction of the helicopter into the ground forces Ka-31 can be deployed in small unprepared sites located nearby mobile anti-aircraft missile systems, providing them with target designation. It should be noted that, in connection with the liquidation in the Russian Navy ships Project 1143 enthusiasm for this machine by the customer fell significantly in batch creation for Russian Navy helicopter off. The only 2 cars available in the fleet, based on the aircraft carrier "Admiral Kuznetsov". In all this there is reason to assume that the number of helicopters of this class in the Russian Navy will increase with the commissioning of helicopter-docks of the "Mistral".

Tatkiko-technical properties of the Ka-31

Dimensions: diameter of the screw head — 15.9 m, length — 11,6 m, height — 5,5 m, width — 3,8 m
Weight, the largest take-off — 12,500 lbs.
Motor type — two TV3-GTE 117VK, 2h1660 kW capacity.
Cruising speed — 220 km / h
The highest speed — 255 km / h
Flight range — 680 km.
Flight duration — 2 hours 30 minutes.
Service ceiling — 5,000 m
Crew — 3 people.

Sources disk imaging
-http://www.opoccuu.com/251111.htm
-http://www.vertolet-media.ru/helicopters/kamov/ka-31/
-http://www.airwar.ru/enc/sh/ka31.html
-http://ru.wikipedia.org

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