Dhruv Advanced Light Helicopter (ALH)
The indigenously developed Dhruv is a multi-role new generation helicopter in the 5.5-ton weight class. It has flown extensively in diverse terrains ranging from hot tropical deserts to the great Himalayan ranges. Dhruv has high military capabilities for heliborne assault, logistic support, casualty evacuation, reconnaissance and training. It can also be used as air observation post.
It is designed to meet the requirement of both military and civil operations. The civil variant of Dhruv carries forward the ruggedness of the military variant. It can carry six passengers in the executive version and twelve in the passenger version.
The "Dhruv" Advanced Light Helicopter (ALH) designed and developed by Hindustan Aeronautics Limited (HAL), is a unique multirole, state-of- the-art, cost-effective helicopter in the 4-5 ton class. ALH has incorporated hingeless composite main rooter with elastomeric bearings, a bearingless composite tail rotor, integrated dynamic transmission system, full authority digitial engine control and crashworthy composite airframe.
HAL has a letter of intent for 300 of the ALH from the Indian government and its agencies, and hopes to deliver 24 annually. Some 110 are planned for the Indian Army, 150 for the Air Force, and 40 in a combined batch for the Navy and Coast Guard. Nepal is receiving three. In a joint venture with Israel Aircraft Industries, the Dhruv is offered for export with a Lahav avionics package, featuring a glass cockpit and Doppler/GPS navigation.
The Advanced Light Helicopter is HALââ¬â¢s flagship program and it has been accorded high priority in the country in terms of development, production and marketing for the next decade. Indigenously designed and developed to meet the requirements of the Army, Navy, Air Force and the Coast Guard, the ALH can fly at high altitudes, possesses sea-level high lift capability and performs at high speed. It is an armed gunship, a utility transport, an anti-submarine warfare/anti-surface vessel warfare helicopter and a platform for search and rescue and casualty evacuation. The ALHs are powered by two Turbomeca TM 333 turboshaft engines procured from France and these will be produced under licence by HAL.
The first prototype was airborne in August 1992, The second in April 1993, the third prototype had its maiden flight in May 1994 and the fourth prototype with tricycle landing gear took to the skies in December 1995. These four prototypes of ALH underwent development flight testing for performanceevaluation and have successfully completed sea-level, cold weather & high altitude and ship deck trials.
With its wide body, specious and quite cabin, sliding doors, emergency exits, smooth and vibration free rides which are important for passenger comfort, the ALH fits well into the civil role. Large rear clamshell doors provide easy loading of stretchers or other bulky loads. The helicopter is planned for a wide range of civil roles like VIP travel, Commuter, Search and rescue, Emergency medical service, Underslung load, Disaster relief, Offshore operation etc. It is easy to fly and economical to maintain with all these operational flexibility.
ALH has been designed with close interaction with the military from the beginning. With sonar/sonics, radar, ESM, torpedoes, depth charges and anti Ship Missiles, ALH forms one of themost agile and quick response ASW, ASV platform in the world. With the turret gun, rockets, air-to-air missiles and third generation anti-tank missiles, ALH has the teeth for attack alongwith significant self defence and protection system.
The hingeless main rotor offers good maneuverability and maintenance-free operation. The advanced blade profiles ensure low noise, highspeed and efficient lift. The advanced cockpit reduces pilot workload. The extensive use of composites ensures longer life and low life cycle cost. High reliability is due to redundancy in critical system. Easy maintenance is due to modular design and BITE facility in major systems. Integrated Dynamic System offers low vulnerability, increased safety and reliability.
The ALH is built to international design standards stipulated by FAR and US MIL. Designed to cater to the diverse needs of Army, Navy and Air Force, as well as Civil sector, ALH has versatitily to carry out a variety of roles. It can operate with equal ease over sea, high altitude, sandy deserts and adverse environmental conditions. The ALH is presently in the advanced stage of certification, having undergone extensive flight tests for demonstrating compliance with variety of requirements. A civil variant ALH ptototype is also under development.
When the basics of Hindustan Aeronautics Ltd.ââ¬â¢s Advanced Light Helicopter were revealed in November 1984, it seemed then a tour de force of modern rotorcraft technology, featuring a hingeless main rotor, bearing-free tail rotor, Fadec and the extensive use of composites throughout its 12- to 14-passenger airframe. However, difficulties with program supporter MBB slowed the program, and funding cuts and disagreements between HAL and the Indian militaryââ¬âwhich is footing a good deal of the ALH billââ¬âstifled progress still further. The imposition of US sanctions against India after the nuclear tests of 1998 restricted access to LHTEC 800 - the ALH's intended power-plant. This forced HAL to re-certify the aircraft with the less powerful Turbomeca TM333-2B turbo-shafts
In March 2002 HAL delivered its first advanced light helicopter to the Coast Guard, ten years after the prototype made its maiden flight. The helicopters cost 250 million rupees (5.1 million dollars) each.
The prototype of the Army version was first flown in 1994 and the Army, Navy and the Air Force received the initial helicopters in mid-2002. HAL deliver 10 of the helicopters to the armed forces and during the year the company made about 14 helicopters. Production was slated to rise to 34 in 2003, which would include the civilian market. The Indian military has expressed a need for over a hundred ALHs. Half of the Army's 120 ALH order will be weapons systems integrated, with the remaining serving in utility and transport roles.
HAL concentrated on integration work. With the turret gun, rockets, air-to-air missiles and third generation anti-tank missiles, ALH has the teeth for attack together with self-defence and protection systems. The naval version of the ALH is fitted with sonar/sonics system, surveillance radar, ESM system and tactical mission system and is armed with torpedo/depth charges and anti-ship missiles for anti-submarine and anti-surface vessel missions.
The Air Force received its first two Dhruvs (J-4041 and J-4042) on 30 March 2002. The IAF intends to procure Advanced Light Helicopters (ALH) as utility helicopters from HAL to replace the Chetak helicopter. The ALH received good reviews at the recently concluded Singapore Air Show where the IAF displayed the helicopter through its display team ââ¬ÅSARANGââ¬Â. The initial helicopters would have a conventional cockpit, which would be upgraded to a glass cockpit with an upgraded engine. In February 2004, 5 ALHs of IAF participated in the air display a Singapore Air Show.
Specifications
Length :
12.89 m
Height :
3.76 m
Wingspan :
13.20 m
Weight empty :
2216 kg
Max. T/O weight :
5500 kg
Cruising speed :
245 km/h
Max. speed :
280 km/h
Climb rate :
9.00 m/s
Max. Range :
400 km
Service ceiling :
6000 m
Engines :
2x Turboprop Engine - Turboméca TM 333 2B
Power rating :
1000 wps
Total power rating :
2000 wps
Crew :
2
Payload :
14pax (max 1500kg)
Thanks,
Miro