Sikorsky S-70 (UH-60 Black Hawk)
Sikorsky S-70 (second name - UH-60 Black Hawk) - a multi-purpose helicopter, which was intended as a replacement unit Bell UH-1, was able to transport troops in 11 night outfit.
Start developing a helicopter that dates back to the distant city of 1966, together with the start of the program Utility Tactical Transport Air System (UTTAS). The US government submitted a helicopter-leading companies Boeing-Vertol, Bell, Sikorsky and Lockheed technical requirements for the construction of a new multifunctional helicopters UTTAS. The new unit was to replace outdated at the time multipurpose Bell UH-1 and transport CH-46 Sea Knight, who were armed with various parts of the country's air force.
In 1971 year program UTTAS, which is a development of multi-purpose helicopter for various needs of the Air Force approved. According to the requirements of its new device it had to be transported from the 11 15 people to the personal composition of the military in the shooting department, have a crew of three people, equipped with dual-engine power plant, providing the possibility of transportation of assembled aircraft Lockheed C and C-141-130.
UTTAS program became the most expensive in the history of the American helicopter. In 1972 year received an order for production under this program 1100 machines, which planned to produce up to 1985, the initial cost of UTTAS, including the costs of the purchase and continued operation of multi-purpose helicopters, initially estimated at $ 2,7 billion, then this increased to $ 6,5 billion . The cost of one copy too, grew up with 2 5,8 million $.
In the first stage of the competition representatives of the US Air Force have eliminated seven of the nine companies, while leaving the company Sikorsky and Boeing-Vertol, which was given the opportunity to collect coupons helicopter. The first contracts were signed for the assembly of the three devices for flight testing and one - static ground. After the final determination of the manufacturer must be concluded another contract for 5 machines to continue the cycle tests.
Each manufacturer at this stage has been allocated an amount of $ 61 million.
The program UTTAS company Sikorsky unveiled prototype version YUH-60, and Boeing-Vertol - YUH-61. The first flight of the prototype took place YUH-60 17.10.1976, after passing a series of flight and static tests. The firm Sikorsky recognized winner of the contest and immediately offered her a contract to build the first series of helicopters 15 units, which are called UH-60A.
The main criteria which influenced the choice in favor of the Sikorsky UH-60A, - it is smaller costs during operation and less technical risk of the use of the helicopter.
Sikorsky UH-60 became the basis for the creation of a number of modifications of helicopters for various purposes. The program is first expanded their production units to 1434., And then - to 2127 units. The average price of one helicopter was 7, 25 million $. In early summer, with the 1994 2000-rolled off the first line of the machine H-60. At that time, this family 1295 helicopters were supplied by the army, 78 207 BBC and directed to export 21 countries.
Helicopter Sikorsky S-70 built single-rotor scheme with two turbine engines, tail rotor and tricycle type landing gear.
The fuselage is made of semi-monocoque type, it is an all-metal construction. The material of the fuselage structure mainly applied light metal alloys. Composite materials (fiberglass, Kevlar) was used in the design of the control room, doors, lamp, bonnet and engine fairings.
Get inside double cabin crew may be discharged through the side doors. The cabin is equipped with armored crew seats. Dimensions of cargo cabin - 4,95 2,21 x x 1,87 m, volume - 11,6 m³. On both sides of the cabin doors are located, whose size is 1,5 1,75 x m. Inside the cargo compartment can accommodate six or ten paratroopers wounded with a stretcher.
At the rear of the fuselage tail boom goes into the type monocoque, which has an asymmetrical profile and upwardly bent end beam with stabilizer attached thereto and the tail rotor. Stabilizer direct operated, has a span of 4,37 m. The installation angle is changed with the stabilizer control system to receive signals of the lateral acceleration, angular velocity and air. In the self-rotation angle of installation of the stabilizer is -6, and hovering + 34.
The tail boom can be folded for easy transport and save space in the parking lot. The fuselage is equipped with anti-shock design that is able to withstand the overload 10g vertical impact and 20g - front. The helicopter is equipped with a rescue hoist, wire rope which is 69 m long and has a load capacity kg 270. Load hook can withstand up to 3630 kg on external sling.
Chassis tricycle helicopter, fixed landing. Taken on each support one wheel.
The main pillar of the lever-type shock absorbers are equipped with a two-chamber. Depreciation pneumohydraulic system chassis allows to absorb the impact on the ground without touching the fuselage equal 40g overload.
The helicopter has a rotor chetyrehlopasny, hinged blades. Screw sleeve has a monolithic structure, made of titanium alloy and equipped with dampers and elastomeric bearings require no lubrication. This allows you to 60% reduce the amount of maintenance work.
The blades have a rectangular shape. The side members with an oval cross section made of a titanium alloy, the tail portions have honeycomb "Nomex." Inboard portion and the trailing edge of the blades are made of composite graphite materials, paneling made of fiberglass. On the toe of the blade there is a titanium strip, and along the sock placed fiberglass counterweights. Helical tip is arrow-shaped and made of Kevlar.
Sikorsky S-70 incorporates the anti-icing system of the rotor blades, self-adjusting pendulum absorbers sleeve vibrations, the brake rotor.
The four-tail rotor has a diameter of 3,35 m and hingeless mounting blades. End beam with it tilted at an angle of 20 degree laterally to increase the range centering and creating vertical thrust component. Bushing tail rotor is represented by two crosswise arranged beams.
The blades are rectangular in its composition are composite materials based on grafitoepoksida. Similarly, the rotor blades are also equipped with steering elements electrical anti-icing system.
As part of the power plant two turboshaft GTE General Electric T700-GE-700. They are located in nacelles on both sides of the pylon. The engine was tested in a combat operation in Vietnam.
The modular design simplifies the maintenance of the transmission. The main gear is capable of operating over 30 minutes without lubrication.
The composition of the fuel system includes standard internal fuel tanks having a capacity of 150 l. For an extra internal tank capacity l 440. Options helicopter HH and MH-60-60 can be complemented discharged tanks on vysokoraspolozhennyh wing-shaped pylons, the maximum amount of fuel loaded into the fuel tanks Sikorsky S-70, 3545 is l. The helicopter is equipped with a bar-flight refueling.
Sikorsky S-70 characteristics:
Power point:2 x GTE General Electric T700-401
take-off power on1285kVt
the diameter of the rotor:16.36m
the length of the fuselage refueling rod c:17.38m
Maximum speed:268km / h
cruising speed:237km / h
static ceiling out of ground effect:3170m
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