History Construction Tally

Sikorsky-Mielec Black Hawk S-70i. 2010

Krakow 2018-05-23

317b Section 2010-03-15

Sikorsky-Mielec Black Hawk S-70i



Black Hawk. Photo by Karol Placha Hetman
Black Hawk. Photo by Karol Placha Hetman

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.


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

The helicopter was developed in terms of increased resistance to crush during a fall. In the event of 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 armored with a Kevlar. The entrance to the cockpit is provided by a car door on the left and right side, with a height of 1.37 m. They can be broken down in an emergency. The canoe takes 11-14 fully armed soldiers aboard. After dismounting the middle seats, 4-6 pairs of stretchers or cargo can be mounted. The load compartment is heated and air-conditioned. Access 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 volume of the cockpit and holds is 10.90 cubic meters.
The system of external suspension with the designation ESSS consists of a set of catches fixed to the hull and four booms mounted to them. The total lifting capacity of the external suspension is 4,536 kg.

Vertical elevation is the widened tip of the tail beam. In its interior are an intermediate gearbox and a tail rotor gear placed on the right side.

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

The tail beam part is folded to the right.

Three-wing chassis with tail wheel. Constantly. front, main with 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

Carrier rotor

Four-blade carrier impeller with 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 in horizontal flight. The angle of the spade is 18 degrees. The tips are skewed angles with an angle of 20 degrees. The shovels have oval cross-section girders. The flow of blades made in the hive system of nomexsu with the epoxy-gray composite coating. The shovel blade is also made of glass fiber composite, additionally covered with a titanium cover. The tips of the blades were made of Kevlar. The shovel withstands a puncture with a 23 mm bullet. In the interior, the shovel is filled with pressurized gas and has sensors that inform about the durability of the structure. The de-aerating of the leading edge is carried out using the electrical system.

Elastomer bearings of the C / R Industries rotor head are lubricated. Vibration dampers are mounted in the head. The head has been designed so that you can manually fold the rotor blades for easier to hangar or loading to a transport aircraft. Rotor diameter: 16.36 m (53 ft 8 in).

Tail rotor

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. Works as a pulling propeller. Its surface is deviated from the vertical to the left by an angle of 20 degrees. Thanks to this, 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.

Main gear

The main transmission in a conventional system. Two turbine engines with a free turbine transmit the drive through planetary gears and a set of gears to the main shaft of the main rotor and to the propeller shaft propeller. The main transmission 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 down to a dozen centimeters down to hang or transport by plane.

Drive system

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 is 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. A 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.

The engines are far away from each other, which makes it impossible to destroy them both with one hit. 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 - Solar type T-62T-40-1. Engine starting system from Garret. Additional installations for starting engines at extremely low temperatures can be used.

The Pallet 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 install additional tanks in the hold or on external booms.


Electrical installation with voltage 24/28 V. Current generators manufactured by Bendix 30/40 kVA and 20/30 kVA. Nickel-cadmium batteries with a capacity of 17 Ah. Fire protection system with fire extinguishers installed in the drive compartment and in the fuselage. Starts 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.

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

Rotor diameter: 16.36 m (53 ft 8 inch)

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, 1 705 liters tank (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 turbine, 1,409 kW (1.940 hp)


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 minutes

Useful ceiling: 6.096 m (20,000 ft)

Lifting speed: 11.43 m / s (2.250 ft / m)


Weapons: M240, MAG-58, M3M, Gau-19

Missile missiles: Hydra

Missile missiles guided: Hellfire (x16)

Written by Karol Placha Hetman