Sikorsky-Mielec Black Hawk S-70i. 2010. English version

Kraków May 23, 2018

317b Rozdział 2010.

Sikorsky-Mielec  Black Hawk S-70i

Poland

Construction

Black Hawk

Construction S-70 / UH-60 Black Hawk.

 

The S-70 / UH-60 Black Hawk helicopter is built in the classic system - Sikorsky. It is a medium, twin-engine, all-metal, multirole helicopter.

The fuselage

The fuselage made of aluminum alloys with the participation of composites (fiberglass and kevlar laminates). The floor in the cockpit and hold made of fiberglass and nomex laminate. The compass was also used in the tail beam. Such a beam is lighter by 10% than a traditional one made entirely of metal.

The helicopter has increased resistance to crush during a fall. In a collision with the ground with a vertical speed of 11.5 m / s and a horizontal velocity of 12.2 m / s, the structure of the helicopter should behave in 85%. It should withstand a horizontal acceleration of 20 g and vertical acceleration of 10 g.

The crew's armchairs are Kevlar armored. The entrance to the cockpit is provided by a car door on the left and right, with a height of 1.37 m. They can be denied emergency. The helicopter takes armed soldiers on board 11-14. After dismantling the middle seats, 4-6 pairs of stretchers or cargo can be mounted. The load compartment is heated and air-conditioned. The entrance to the hold is provided by a large sliding door on the left and right side, with a height of 1.75 m. The helicopter can take 105 mm howitzer, 50 missiles to it and a service consisting of 5 soldiers. The interior of the helicopter is 10.90 cubic meters.

The external suspension system has the designation ESSS, and consists of a set of catches fixed to the fuselage and four booms mounted to them. The total lifting capacity of the external suspension is 4,536 kg.

Vertical stabilization is the widened tip of the tail beam. In its interior is an intermediate gear and a propeller gear. The propeller placed on the right side.

Horizontal contour has a large surface, with a trapezoidal contour and variable angle wedged: from +34 degrees (during hover) to -6 degrees (with autorotation). Its automatic control system takes into account the flight speed of the helicopter as well as the inclination and lateral acceleration. Helicopter control is doubled electric and additionally manual, mechanical.

The tail beam part is folded to the right.

The helicopter's chassis is three-support with a tail wheel. The main chassis has powerful shock absorbers from General Mechatronics. Pneumatics of the main landing gear wheels are 26x10.00-11 and the tail wheel 15x6.00. Main landing gear spacing: 2.70 m. Chassis base 8.83 m

Helicopter carrier rotor.

Four-blade bearing impeller, rectangular contour and Sikorsky SC-1095 profile with a relative thickness of 9.5%. The width of the rotor blades: 0.53 m. The central part of the blade has an overhang of the leading edge and a flap at the trailing edge to overcome the turbulence from the previous blade. The angle of the blade is 18 degrees. The tip of the blade is slanted, with an angle of 20 degrees. The blades have oval cross-sections, made of titanium. The blades is of a honeycomb type construction, made of nomexsu, with an epoxy-gray composite coating. The blade  is also made of glass fiber composite. In addition, it is covered with a titanium cover. The tips of the blades were made of Kevlar. The blade isn't destroyed after piercing with a 23 mm caliber bullet. In the interior, the blade is filled with pressurized gas and has sensors that inform about the durability of the structure. Removal of ice from the leading edge is carried out by means of an electrical system.

Elastomer bearings of the rotor head by C / R Industries do not require lubrication. Vibration dampers are located in the head. The rotor head was designed for the manual folding of the blades. Rotor diameter: 16.36 m (53 ft 8 in).

Tail rotor of the helicopter
A four-blade tail propeller with a similar structure as the rotor blades. Also electrically de-iced. It is placed on the right side of the tail beam. It works as a pulling propeller. Its surface is deviated from the vertical to the left by an angle of 20 degrees. As a result, it produces a small upward thrust, which makes it easier to balance the helicopter and allows for a greater center of gravity. Diameter of the tail rotor: 3.35 m.

Helicopter main transmission
The main transmission is in a conventional system. Two turbine engines with a free turbine, transmit the drive to the rotor and to the tail rotor. The main gearbox has a structure consisting of five modules. It is possible to work after total loss of oil for 30 minutes. The rotor head may be several inches downwards for aircraft hangar or carriage.

Helicopter powered
The power unit consists of two General Electric T700-GE-700 turbines with a capacity of 2 x 1 151 kW. The civilian version of the engine has the designation General Electric CT-7-2C. Their total power transferred to the transmission is 2,109 kW. The newer version is General Electric T700-GE-701 A with a starting power of 2 x 1 285 kW.

Engine construction: 5-degree axial, 1-degree radial, annular combustion chamber, 2-stage turbine, free turbine. 5: 1 compression, air flow 4.5 kg / s at 44 720 rpm. Free turbine with a rotational speed of 17,000 - 21,000 rpm. The engine was mainly made of AM-355 stainless steel. Dimensions 1.181 m x 0.635 m x 0.584 m.

Both engines are distant from each other, which makes it impossible to destroy them both with one projectile. In addition, they have fire barriers between each other. The engines are capable of operating in extreme climatic conditions, high resistance to the opponent's fire means, simple operation, small dimensions in relation to the power achieved. These engines are also used in Apache AH-64 helicopters.

The air inlets can be fitted with ring filters that capture 85% of air pollutants: sand and dust.

APU - type - Solar T-62T-40-1. The engine starting system is Garret. Additional installations for starting engines at extremely low temperatures are possible.

The fuel installation consists of two tanks located behind the loader with a total capacity of 1 340 liters. The tanks have high crush strength and are self-sealing. It is possible to mount additional tanks in the fuselage or on the outer booms.

Helicopter equipment
Electrical installation with voltage 24/28 V. Current generators manufactured by Bendix with 30/40 kVA and 20/30 kVA parameters. Nickel-cadmium batteries with a capacity of 17 Ah. Fire protection system with fire extinguishers installed in the drive compartment and in the fuselage. The installation is started automatically or manually.

Avionics (as of 1985)
Radio stations E-system AN / ARC-114 VHF-MF, Sylvania AN / ARC-114 UHF-AM, Magnavox AN / ARC-164 UHF-AM, Colins AN / ARC-186 VHF-AM / FM, transponder IFF Bendix AN / APX-100, radio communication encryption system Magnovox TSEC / KT-28, on-board telephone, Emerson AN / ARN-89 radiocomputer, Bendix AN / ARN-123 radio signal receiver, Sperry AN / ASN-128 girokompas, Honeywell AN / aPN radio altimeter -209, Melpar-Memcor AN / APR-39 radio warning receiver, infrared set Sanders AN / ALQ-144, automatic flight control system from Hamilton Standard with three-axis automatic remote control.

Specification (Data T-T) Black Hawk S-70i
Crew: two people
Capacity: 14-17 seats / 12 soldiers / 6 stretchers
Load capacity: 4 072 kg (9,000 pounds)
Length: 19.76 m (64 ft 10 in)
Fuselage length: 15.26 m
Length after folding the blades and tail beam: 12.60 m
Fuselage  width: 2.36 m
Span of the horizontal stabilizer: 4.38 m
Overall height: 5.13 m
Diameter of the rotor: 16.36 m (53 ft 8 inches)
Diameter of the tail rotor: 3.35 m
Height: 5.33 m (17 ft 6 in)
Own weight: 5347 kg (11.790 lb)
Max. Starting weight: 9.979 kg (22 000 pounds)
Internal fuel: 1360 L
Auxiliary fuel: internal tanks 2 x 700 liters, tank 1,705 liters (450 US gal) on deck and 872 liters (230 US gal) in tanks on each of pylons or 1 705 liters (450 US gal)
Power unit: 2 × General Electric T700-GE-701D turbocharger, 1 409 kW (1.940 hp)
Efficiency
Maximum speed: 361 km / h (195 knots, 224 mph)
Cruise speed: 163 knots (301.8 km / h), maximum cruise (149 knots, normal cruise)
Range: 463 km, (288 m, 250 nm) with reserve of 20 min
Useful ceiling: 6.096 m (20,000 ft)
Lifting speed: 11.43 m / s (2.250 ft / m)
Armament
Weapons: M240, MAG-58, M3M, Gau-19
Missile missiles: Hydra
Missile missiles guided: Hellfire (x16)

 

Written by Karol Placha Hetman