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Indian Army Aviation Helicopters - Cheetah , Chetak and ALH Dhruv

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Uploaded on May 1, 2011

CHEETAH
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Type: Light utility helicopter
Accommodation: Two seater, side-by-side. A stretcher for CASEVAC (Casualty Evacuation) can be slung underneath.
Engine: One 870 shp Turbomeca Artouste IIIB.
Speed: 192 km/h (115 mph; 100 kts.)
Service Ceiling: 6400 meters (20,992 ft.)
*Indian Cheetahs have deployed to 7500 meters (24,600 ft.)
Range: 260 nautical miles (500 km; 300 miles)

Dhruv
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Type: Advanced multi-role light helicopter.
Flight Crew: Two.
Length: 15.87 meters.
Main Rotor Diameter: 13.20 meters.
Height: 4.98 meters.
Weights: 2502 kg (5515 lbs.)
Useful Load: 2600 kg (5731 lbs.)
Speed: Maximum - 290 km/h (180 mph)
Max. cruising speed 253 km/h (157 mph)
Service Ceiling: 5990 metres (19,680 feet)
Range: With 1500 kg (3300 lbs.) payload - 216 nautical miles (414 km; 249 miles).With max. fuel & 20 min. reserves - 431 nautical miles (810 km; 497 miles).
Fuel Capacity: 1100 kg (2425 lbs.)

Armament: The Army's 'weapons system integrated' helicopters will feature a chin-mounted, three barrel 20mm gun from Lockheed Martin and four pylons - each having two hard points - which will enable it to carry eight Nag anti-tank guided missiles, four 68mm or 70mm rocket pods or four tube-launched air-to-air missiles.

Design Features: The Dhruv features a 'System Bolkow' four-blade hingeless main rotor with carbon fibre composite blades. The blades have advanced aero foils, swept back tips for reduced nose, and feature a ballistic tolerance against bullet hits of up to 12.7mm calibre. The fibre elastoner rotor head holds the blade between a pair of CFRP star-plates, with manual blade folding and a rotor brake provided as standard equipment. A four blade bearing-less crossbeam tail rotor is fitted on the starboard side of the pylon. Vibration damping is provided by an anti-resonance isolation system compromising four isolator elements between the fuselage and the main gearbox. An integrated drive system transmission comprises of the rotor hub, main transmission, upper controls and main rotor hydraulics. The Dhruv also features a four axis automatic flight control system, with an integrated control & stability augmentation system from France.

The airframe makes extensive use of composites (Glass Fibre, Carbon and Kevlar) and accounts for 29% of overall structural weight and 60% of surface area. The military variants include crashworthy fuel tanks, frangible couplings and infra-red suppressors for the engines. The helicopter design enables the crew to survive vertical impacts of up to 30 feet per second, due to the safety seats and a design of controlled deformation of fuselage crumple zones. The cabin was designed to seat 12 people, however 14 can be accommodated in a high-density configuration. Rearward-sliding passenger doors are featured on either end, with large clamshell doors at the rear of the cabin. The clamshell doors can be removed, in exceptional cases, to carry unusual & unwieldy loads. An underslung load hook is standard on military variants. The air ambulance variant enables the Dhruv to accommodate two to four stretchers, with a couple of attendants.

Avionics: A communication radio (U/UHF, HF/SSB and standby UHF modes), IFF & intercom, with a Doppler navigation system, TAS system, radio altimeter and ADF are standard in all military variants. A weather radar and the Omega navigation system is optional on the naval variant.

India Defence - Youtube Channel
http://www.Youtube.com/IndiaDefence


LANCER
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Lancer is based on the airframe of the Cheetah helicopter, the Lancer featured a redesigned 'bubble' made up of smaller toughened perspex panels , two armament pods slung on either side of the aircraft with machine guns and rockets and Armour protection to critical parts of the Helicopter. The Lancer also incorporated Flare / Chaff launchers for protection against the MANPAD threat.


CHETAK
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Type: Light utility helicopter.
Accommodation: Two seat side-by-side seating in cockpit. Main cabin can carry up to four passengers. A bit larger and more refined than the HAL Cheetah, with a fully faired fuselage structure.
Engine: Two 870 shp Turbomeca Artouste IIIB.
Speed: 210 km/h (126 mph; 109 knots).
Service Ceiling: 3200 meters (10,496 feet).

Range: 260 nautical miles (540 km; 300 miles).

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