Friday, January 6, 2012

Should India buy the British made Elizabeth class supercarriers?

The Indian Navy's fleet consists of only one aircraft carrier, "INS Viraat" which is not a super carrier and is seriously ageing.Although India will commission its first indigenous made carrier, INS Vikrant in 2014 and INS Vikramaditiya is undergoing sea trials in Russia and will be commissioned by Dec 2012.Still we are far away from being regarded as a blue water navy .India should buy a new carrier from Britain by investing 2 billion pounds.It is being reported by many media houses that by buying this aircraft carrier we are indirectly escalating the financial pressure of the British Defense Ministry.But if we will think in a different mind set we are getting a great chance to learn the British know how of making these kind of huge ships. The purchase of this carrier will ultimately reduce some threat faced by India from China which is having a huge carrier of more than 60,000 tonnes displacement,none of the carriers in India will have this huge dispalcement.India should possess at least 4 super carriers of large displacement (2 conventionally powered and 2 nuclear powered) in order to stabilize the whole South Asian region .
Elizabeth class are the newest designed carriers with displacement of 65,000 tonnes.This displacement is second only to the American Nimitz super carriers and the architectural design of the British Navy has always been the standard is relatively high.More over the carrier uses a lot of new technology.Because of its design time is relatively late,it is said to be using 2 ship road configuration.,but deck equipped with catapults.If this will be considered by the Indian Defense Ministry the definitely this will give India a chance to operate E2D Hawk Eye aircrafts from the carrier which has been offered to India by USA.TO BE A PART OF BLUE WATER NAVY CLUB INDIA NEED SUCH TYPE OF SUPER CARRIERS...

India to develop AIP technology


India's Defence Research and Development Organisation (DRDO) is developing a land-based prototype for air independent propulsion (AIP) technology to reduce submarine vulnerability, defence minister AK Antony revealed.
The technology project is being supported by the Naval Materials Research Laboratory (NMRL) and is expected to be demonstrated by 2015, Antony added.

Meanwhile, the Indian Navy is preparing to float the request for proposals to procure six air independent propulsion (AIP) submarines that is likely to be issued to DCNS, HDW and Amur Design Bureau.

The $11bn procurement was approved by the Defence Ministry last year and is expected to be floated by the year-end or in early 2012.

Evolution of the Indian Submarine Arm


“Of all the branches of men in the forces there is none which shows more devotion and faces grimmer perils than the submariners.” — Sir Winston S. Churchill
The development of the self propelled torpedo and the submerged diesel engine run by powerful storage batteries resulted in the creation of what modern navies call submarines. They let loose a trial of terror and destruction in both the World Wars. The submarines came into limelight during the earlier years of this century and gained considerable notoriety by wreaking havoc upon Allied merchant and naval shipping during World War I.
The evolution of the significance of submarines led to the belief, “there are only two kinds of naval vessels – submarines, and targets.” The submarine is a formidable weapon system and without a submarine no navy in this world can be considered complete. The Second World War witnessed the reaffirmation of the submarine’s role as an offensive force at sea. During the Second World War the battleships were replaced by the aircraft carriers as ‘queen of the seas’1 due to their ability to support a fleet and aircraft operations, far ashore. The second half of the twentieth century has witnessed nations clamoring for submarines in addition to traditional battleships. By 2000, the traditional diesel submarines had lost its presence by the massive introduction of the nuclear submarines.

The Indian Navy and Submarines

Pre World War II, the Royal Indian Navy (RIN) had a very limited role as a defence force and was restricted to coastal defence only. During the Second World War, the British expanded the RIN and changed its role from a coastal defence force with an offensive role. During the period 1939-1945, RIN underwent a phenomenal expansion. Still, the proposal to acquire a submarine for the Indian Navy was discouraged by the British naval officers who were then still in commanding positions in the Indian Navy , on the grounds that the sophisticated technology and the skills required to operate submarines were beyond the capability of the Indians2.
The Submarine Fleet in FormationWhen India attained independence, its officers and men who had seen the havoc caused by submarines in the North Atlantic, first hand, pressed for the creation of a submarine arm. But it took several years before the plunge was taken. In post independence period the political leaders never felt the importance of the development of Navy; in other words, they never expect any threat from sea. India could never think of a belligerent neighbour except Pakistan which did not have any developed Navy as well.
The Nehruvian Government with its focus on the agrarian sector never wanted to spend a major share of annual budget for the defence. Secondly the Western powers did not want India to possess such a formidable weapon. The British officers wanted the Indian Navy as a small force in a coastal defence role and the Royal Navy to continue to be responsible for overall oceanic and maritime defence of India.
In 1948, due to budgetary constraints, the Navy was asked to recast its requirements. The Navy’s
ten year plan 1948 – 1958 gave lesser priority to the Submarine Arm because it could not be created by 1958. In 1951, since large scale naval expansion could not be afforded, the Navy proposed a ship replacement programme instead of a ship acquisition programme. There was no plan to acquire a submarine in this plan. By 1956 the Indian Navy realized the importance of upgradation of the Navy, because of Pakistan’s admission into CENTO and SEATO and was consequently to be given extensive naval assistance by the Americans and Britain.
As a result, in one of the appreciations of the future naval requirements for India and Pakistan is the early 1950’s, the British Admiralty said that it was in the interest of the Commonwealth as a whole that India and Pakistan should maintain such naval forces as could be supported by their resources in material, manpower and finance and that the functions of these naval forces in war would primarily be to provide for the security of India and Pakistan including provision for harbour defence, minesweeping and coastal convoys, and secondarily, to contribute to the overall security of the British Commonwealth. This would also include a share in the control of sea communications in the Indian Ocean, particularly in the Arabian Sea and the Bay of Bengal3.
In addition to the arguments used earlier, it was emphasised that China possessed submarines, some of which had sufficient range to operate in the Bay of Bengal.
The proposal to form a Submarine Arm was taken up in earnest for the first time in 1959. The initial proposal envisaged the acquisition of four submarines from the Royal Navy at a cost of Rs 16 crores, with a recurring cost of Rs 2 crores annually for operation and maintenance. The preamble and the plans paper on the ‘Outline Plan for the Reorganisation and Development of the Royal Indian Navy’ prepared by the Naval Headquarters immediately after the independence mentioned, “The Navy and Army of India as united have existed for over 300 years. The Army on the date of partition numbered some 480,000 men and was fully equipped as a modern fighting machine. The Royal Indian Air Force had existed for only ten years but at the date of partition possessed some 11 squadrons of aircraft. The Navy by contrast, possessed but a handful of small ships4.”
“A submarine is an integral part of a maritime force… In a local or global war in which India may be forced to take part, submarines can be employed in enemy controlled waters and in strikes against hostile ships on the high seas and in harbour. Submarines are one of the most effective means of blockading the enemy’s seaborne trade…..” The statement mentioned the possible uses of submarine against submarines, as radar pickets, and even as aircraft control ships for providing valuable early information. Concluding the argument, the proposal recommended, “In order to develop a fully integrated maritime force, the Indian Navy should make an early start in establishing a Submarine Arm of its own. The important thing is to acquire the technique of operating submarines as early as possible, and for the purpose, a start with conventional or old submarines will provide and adequate answer.”
INS SHISHUMAR - German design HDW 1500 (SSK) submarine (1980s)According to Admiral AK Chatterji “the long delay in acquiring a submarine was due firstly, to the lack of funds allotted to the Navy as the Government considered the Navy to be a less important service in the face of threats on land; and secondly, the unwillingness of USA and Britain to let us have a submarine on suitable terms.”5
“The British were adamant in their views that submarines were sophisticated weapon systems which were difficult to operate, that the Indian Navy was still too young to venture into the submarine field, that submarines were accident prone, that the loss of a submarine at sea would lead to the loss of confidence in the Navy at Governmental and national level which would gravely impair the Navy’s further development”6.
During all these years, there had been no progress on the acquisition of submarines. According to Vice Adm Hiranandani, there were several weighty reasons. “Until 1956, the Navy itself was fully stretched, personnel wise and budget wise, in remedying the after-effects of the partition of the Royal Indian Navy. Ships and aircraft were being acquired and training, repair and logistic facilities were being set up ashore. After 1956, the Navy’s efforts were primarily focused on acquiring ships and aircraft to cope with the increased threat from Pakistan. The Navy found it extremely difficult to carry conviction, either in India or in Britain, that the Submarine Arm was a priority requirement. In the context of a non- violent, peace-loving member of the British Commonwealth whose overriding priority was economic development, nobody was prepared to accept that India at all needed a patently offensive Submarine Arm”7.
India had wanted an Oberon or Porpoise class submarine from the Admiralty, however, the latter was prepared to offer only obsolescent ‘A’ class submarines of Second World War vintage. The decision on the acquisition of Russian submarines thus marked an end of an era for the Indian Navy in several ways8.
The proposal to establish a submarine arm continued to be in a state of limbo, ostensibly owing to lack of finances, but it suddenly acquired urgency with the arrival of the new frigates with anti-submarine capability, mainly because it had been reported in 1958 that a neighbouring country was considering the acquisition of submarines for its navy.
In a proposal on the subject submitted in 1958, Naval Headquarters stated that there was an urgent need for augmenting the facilities available in the Navy for the anti-submarine training of surface ships with live submarine targets and unless this could be achieved, the efficiency of the Navy in anti-submarine warfare would remain low. It added that the acquisition of modern ships fitted with the latest anti-submarine equipment did not by itself constitute an efficient anti-submarine force for, among other things; it required a high degree of sustained and continuous training with live submarines under realistic conditions.
Admiral Chatterji states “A paper was submitted to the Government in 1959 for the acquisition of three operational submarines which would also naturally be available as target submarines for the anti-submarine ships. Protracted discussions took place with the Government at various levels over years without much progress”9.
The Navy found it extremely difficult to carry conviction, either in India or in Britain, that the Submarine Arm was a priority requirement.
The proposal stated that to start with flotilla of at least four submarines, technical logistic support in terms of docking facilities, battery and periscope repairs and maintenance and refitting would be provided by the Naval Dockyard at Bombay. The other facilities required would be a shore base or a depot ship with machine shops, torpedo preparation shops, electrical workshop and spare gear storage, a fully equipped training establishment for both operational and technical training10. It was also proposed to requisition the services of foreign submarines experts in an advisory capacity for the planning and establishment of the submarine arm, as the Indian Navy at that time did not have personnel with adequate submarine experience.11
Since submarine used diverse tactics to get into a favorable position to fire torpedoes, and to avoid detection by anti-submarine ships, the tactics involved change of depth, speed and course or the use of decoy devices or a combination of two or more of these; it was realized that only officers with submarine experience, born of service in submarines, would know what tactics a submarine likely to adopt under a given set of circumstances. Since the training imparted at the Navy’s Torpedo and Anti-submarine School and Tactical School at Cochin was based on theoretical knowledge, practical knowledge acquired through service in submarines was considered of utmost importance. For this purpose, the Navy proposed the establishment of a submarine-trained cadre of 38 officers and 65 sailors to be trained over a period of four years, the first batch of four officers and twelve sailors being proposed to be trained at the Royal Navy’s submarine school in 1961 for a period of one year.
Several attempts were made to acquire submarine capabilities. They were hindered by a shortage of funds, particularly after the 1962 aggression, and then reluctance on the part of the UK and the USA to equip India with submarines of the requisite class. India had failed to obtain any submarines from the UK, then turned to the USSR in 1965 and thus the flow of ships, equipment, weapons from UK and technical expertise from the British Admiralty to the Indian Navy, ended and India began to explore other sources for state of the art naval hardware.
Torpedo Loading on a TLM Capable SubmarineAfter the military reverses in the border war with China in October 1962, a major defence review was initiated to remedy the inadequacies. This gave the Navy the opportunity to resubmit its case for the acquisition of submarines.12 In addition to the arguments used earlier, it was emphasised that China possessed submarines, some of which had sufficient range to operate in the Bay of Bengal. The Navy therefore needed to acquire submarines, not only for the earlier reasons, but also for employment in the Hunter-Killer role against Chinese submarines.
The new proposal put up in November 1962 asked for three submarines. The justification given was that to keep one submarine continuously on patrol in an area about 1500 miles from India, such as the Malacca Straits, three submarines would be required: one would be undergoing repairs or refit or resting the crew, the second in transit to and from the patrol area and the third actually on patrol.
Vice Admiral BS Soman (former Chief of the Naval Staff in 1963) says, “A serious bone of contention with the Government was the acquisition of submarines. I was convinced that these were crucial for a balanced force, but Prime Minister Nehru and Admiral Mountbatten thought otherwise. After a lot of discussion, I was allowed to raise the matter with the Admiralty when I went to Britain in 1963. As expected, they turned it down – it was clear that the British would only sell us vessels which conformed to their Commonwealth Indian Ocean Defence Plan. This was not acceptable to the Navy and I recommended that we look elsewhere, suggesting that Russia might be a likely substitute. We found the Russians not only ready to sell, but to accept part of the payment in rupees. Thus it came about that the Russians got our custom and remained our major and reliable suppliers over the years.”13
In 1965, a combination of events precipitated India’s decision to acquire the ships and submarines that Russia had offered in 1964, the acceptance of which had been kept pending. The Navy too had been different, and reluctant, to sever its connection with the Royal Navy and wanted to await Britain’s final decision regarding financial assistance for constructing in Britain an Oberon class submarine identical to those being built for the Royal Navy. The Oberon design was the latest at that time. In September 1965, an accord was signed by India and Russia for the acquisition of four submarines, a submarine depot ship, five Petya class submarine chasers, two Landing Ship Tanks and five patrol boats.
INS Amba - Submarine Depot ShipIt came from what was then a non-traditional source – the Soviet Union. In fact it was the purchase of submarines that marked the beginning of a long and fruitful co-operation with the nation in the naval sphere. On 08 Dec 67, the ‘F’ class submarine INS Kalvari was commissioned. She was followed in the next few years by Karanj, Khanderi and Kursura. Then came the ‘mother ship’, a submarine support vessel called Amba. The unit was virtually complete with the arrival of a submarine rescue ship, INS Nistar in 1972.
INS Amba, a submarine depot ship, was commissioned in 1968. Submarines, due to their inherent space limitations have to depend upon a mother or depot ship for essential supplies and certain basic facilities. These include the charging of submarine batteries, provision of high pressure compressed air, dedicated workshop facilities and accommodation for submarine crew.

Bibliography

1. Singh, Rear Adm Satyindra, Under Two Ensigns, The Indian Navy 1945-50, Oxford & IBH Publishing Co., New Delhi, 1986.
2. Singh, Rear Adm Satyindra, Blue Print to Blue Water, The Indian Navy 1951-65, Lancer International, New Delhi, 1992.
3. The Indian Navy: An Illustrated History, Directorate of Naval Operations, Naval Headquarters, New Delhi, 1989.
4. Verma, Capt Bharat, Vice Adm GM Hiranandani, Indian Armed Forces, Lancer Publishers, New Delhi, 2008.
5. Vice Adm GM Hiranandani, Transition to Eminence: Indian Navy 1965-75, Directorate of Naval Operations, Naval Headquarters, New Delhi, 1989.
6. Vice Adm GM Hiranandani, Transition to Triumph: Indian Navy 1975-90, Directorate of Naval Operations, Naval Headquarters, New Delhi, 1989.
7. Jane’s Fighting Ships, 1972, 1973, 1974.

Notes

1. Lall, KB, ‘Indian Navy’s Submarine Arm’, pp.13, Birla Institute of Scientific Research, New Delhi, 1982.
2. Sound of Silence:- Forty Glorious Years of the Indian Navy’s Submarine Arm , pp.9
3. Singh, Rear Adm Satyindra, Blue Print to Blue Water, The Indian Navy 1951–65 , pp.64
4. Naval Plan which quoted by Vice Adm Mihir K Roy in his book ‘War in the Indian Ocean’, Lancer Publishers, New Delhi, 1995, pp57.
5. Adm AK Chatterji was the former Chief of the Naval Staff in 1966. See preface’ Indian Navy’s Submarine Arm’.
6. ibid.
7. Hiranandani, Vice Adm GM, ‘Transition to Triumph’, Lancer Publication, New Delhi.
8. ibid, pp.89. Hiranandani, Vice Adm GM, ‘Transition to Triumph’, Lancer Publication, New Delhi.
9. Chatterji, Adm AK, ‘Indian Navy’s Submarine Arm’, Birla Institute of scientific Research, New Delhi, 1982.
10. ibid, pp 228.
11. Ibid, pp 228.
12. ibid.
13. Quarterdeck, the Indian Naval Magazine, Published by NHQ, 1997.

Thursday, August 4, 2011

Mikoyan I-2000



The new Russian fighter MiG-I-2000Development of Russia's LFI (logkiy frontovoi istrebitel) lightweight tactical fighter has been dramatically accelerated after the Russian Air Force decided it's priorities for the next 10 years.
The I-2000 (Istrebitel [fighter] 2000), is due to become operational in 2005 as Russia's basic front-line fighter. It is also likely to become the leading export product of the Russian aircraft industry. Available information on the I-2000 indicates that it will be closely comparable to the US Joint Strike Fighter,operating in both air-to-air and air-to-surface roles.
The aircraft comes from a long line of Mikoyan lightweight fighters, such as the MiG-15 and MiG-21. It is about the same size as the MiG-21 (shorter by 1.3m but wider by 4.5m), but noticeable smaller than its immediate predecessor, the MiG-29. Take-off weight is estimated at around 12 tonnes; maximum take-off weight at about 16 tonnes.
The design requirements for I-2000 call for reduced radar and infrared visibility and very high manoeuvrability, as well as short take-off and landing. The aircraft will have a blended fuselage/centre wing and a thick wing centre-section, with curved leading and trailing edges. The unusual aerodynamic configuration and powerful thrust-vectoring engines should provide excellent agility. Take-off and landing runs are short thanks to a specially designed landing gear that permits approaches at high angles of attack.
According to official sources, single and twin-engined variants of the LFI are under consideration. The graphics show a twin- engined variant with an all-new power plant. No engines of the required thrust currently exist in Russia.
The first design of a very light new-generation fighter was prepared by Mikoyan in the early 1980s, when design work also began on the heavy fighter, the MFI (sometimes known as the 1-42). The result was 'Product 33' powered by a single RD-33 engine from the MiG-29. It was of conventional design, appearing similar to the US Lockheed Martin F-16.
Although work on Product 33 became well advanced, it was not ordered due to the air force's reorientation towards multi-role aircraft - the lightweight Product 33 could be used for close air combat only. The basic Product 33 design is being offered by Mikoyan to China as the FC-1 fighter.
The only competition within Russia for the I-2000 is the S-54, developed by Sukhoi from an advanced trainer design of the early 1990s.
The S-54 is essentially a smaller, single-engined Su-35, with a more conventional layout than the I-2000. The status of the S-54 is unknown, but is thought to be in the initial stages of development. Having no real Russian Air Force support, the S-54 is intended for export as a complement to the heavy Su-27 and Su-30 aircraft sold to China and India.
It has been decided that the heavy fifth-generation MFI will not enter serial production. It will, however, begin flight tests this August as a technology demonstrator. Mikhail Korzhuyev, recently appointed Mikoyan's general director, said that flights of the MFI are now a matter of honour for the company.
The aircraft has been ready for flight tests for about five years, but grounded for lack of cash. An extensive upgrade programme for the MiG-29 is to continue in parallel with development work on the I-2000.

IMPLICATIONS OF BECOMING SIGNATORY TO NPT



Signing the NPT would force India to forswear its nuclear option. Acceding to NPT means accepting the three basic principles represented by it -- non-proliferation, disarmament, and the right only to peacefully use nuclear technology. Can a country, placed as India is, sign the NPT? More so when the very foundations of the treaty are being shaken thoroughly?
In trying to comprehend the implications, it is very important for us to look at these three following questions:
  1. What made India not sign the NPT in the first place?
  2. Has anything changed between then and now?
  3. Or whether these changes have highlighted the necessity of our accession to the treaty?
India’s objection is that the NPT creates a club of "nuclear haves" and a larger group of "nuclear have-nots" by restricting the legal possession of nuclear weapons to those states that tested them before 1967. But the treaty never explains on what ethical grounds such a distinction is valid. Secondly, while China is recognized as a nuclear ‘have’, India cannot remain a nuclear ‘have not’.
These two objections are still valid even after 40 years of the existence of the treaty. Having been an ‘unofficial’ nuclear power since 1974, India had to bear the brunt of sanctions imposed on it by the US government and had to live with the non-cooperation of the developed world for a better part of the last 40 years on science and technology front. This, in spite of our stated policy of ‘no first use’ of a nuclear weapon against any country and an impeccable non-proliferation record.
If at all there is anything that has changed in between, it is that some of the official ‘haves’ and others have indulged in proliferation. US connivance cannot be brushed aside in Israel’s nuclear program. Nor can Russia’s withIran and China’s withPakistan. Israel (a non-signatory country) has actively assisted South Africa in the 1970’s. The latter is believed to have tested a nuclear weapon in 1979. But it has subsequently destroyed its entire nuclear arsenal and joined the NPT in 1991.
Now Iran has publicly breached the treaty saying that it is only conducting its nuclear program with a view to produce nuclear energy. The suggestion becomes laughable in the light of the fact that Iran has one of the largest reserves of oil (third largest) and natural gas (fourth largest) in the world.Moreover, enriched uranium can only be used in light water reactors. Irandoesn’t possess light water reactor technology. North Korea has publicly withdrawn from the treaty in 2003 and gone ahead and tested nuclear weapons in 2006. The US and four others are trying their best to resolve the impasse with North Korea still.
None of these events necessitate or usher India into signing the NPT. So why should it sign? Having endured the sanctions regime, India had done commendably well in developing its own nuclear and space program strengths. Acceding to NPT is not a solution. Signing the nuclear deal with the US is. It will hasten the process of our development. It will make the world albeit grudgingly admit India into the club of nuclear ‘haves’. It still retains with it the benefits of a non-signatory country and is not obliged by the treaty conditions. Though being a non-signatory country, we have demonstrated a much better non-proliferation record than the ‘haves’ and other signatories.
Will signing the NPT now bring any extra benefit to India? I doubt it. We are fairly developed. Our progress on the nuclear and space fronts has made the world realize that India perhaps can be slowed down, but not stopped from developing its strengths.The deal with US will hasten the process and integrate us into the top tier countries. Singing NPT may bring these benefits with the added conditionality of forswearing the nuclear option. So, why should it oblige?

Tuesday, May 10, 2011

Ukraine’s Motor Sich modernizing An-32 engines for India

Motor Sich based in Zaporizhia has signed a $110 million contract with the Indian Air Force to modernize AI-20 engines for Antonov An-32 military cargo aircraft, a company source told Interfax.
The three-year contract was signed in late December 2009. In all, 100 engines will be modernized starting from the end of this year.
Last July Ukraine and India agreed on the repairs and modernization of 105 An-32 of the Indian Air Force. The contract worth $400 million was signed between the Indian Defense Ministry and Spetstekhnoexport, a subsidiary of Ukrspetsexport. Ukraine won an Indian tender in December 2007.
That was the second largest military technical contract in the history of independent Ukraine. The largest contract of $650 million stipulated the delivery of 320 tanks to Pakistan in 2006.
India said that was the largest contract of the Indian Air Force in recent years.
According to unofficial sources, Ukrainian military exports neared $1.4 billion in 2009, or 20% more than in 2008.
About 40% of Ukrainian military exports go to Southeast Asia and less than 20% to Russia.
Ukrspetsexport forecasted 10% growth of exports in 2009.
INDIA NEED TO MAKE AIRCRAFT ENGINES INDIGENOUSLY WITH THE HELP OF UKRAINE.SINCE INDIA IS PLANNING TO MAKE ITS OWN REGIONAL AIRCRAFT WHICH WILL BE IN SKIES WITHIN A COUPLE OF YEARS...
INDIA AND UKRAINE HAVE ALREADY SIGNED DIFFERENT PACTS IN THE FIELD OF SCIENCE AND TECH,THIS WILL BRING A BOOM TO RELATIONS BETWEEN BOTH COUNTRIES.ALSO THIS WILL HELP INDIA IN SELLING THESE AIRCRAFTS IN THE 3RD WORLD COUNTRIES WHICH WILL BE PROFITABLE FOR INDIAN ECONOMY..WITH THIS INDIA WILL BE CAPABLE TO MAKE BIGGER ENGINES MOST PROBABLY OF 270-300 KN WITH ITS OWN R&D WHICH WILL BE USED IN MANUFACTURE OF BIGGER PASSENGER AIRCRAFTS .
IN ADDITION THIS WILL AFFECT OUR NEIGHBOURS RELATION WITH UKRAINE AND INDIA COULD BE CAPABLE OF ACHIEVING NEARLY 25% OF UKRAINE TECHNOLOGICAL EXPORT ..
UKRAINE HAS ALSO GOT THE EXPERTISE IN MAKING OF CRYOGENIC ENGINES , IN WHICH INDIA IS JUVENILE..THE GSLV FAILURES SYMBOLIZES OUR KNOWLEDGE IN THE FIELD...

Thursday, May 5, 2011

Bin Laden Raid May Have Exposed Stealth Helo(AVIATION WEEK)

By Bill Sweetman william_sweetman@aviationweek.com

A previously undisclosed, classified stealth helicopter apparently was part of the U.S. task force that killed Osama bin Laden in Pakistan on May 1.
The exact type of helicopter is unknown but it appears to be a highly modified version of an H-60 Blackhawk. Photos disseminated via the European PressPhoto agency and attributed to an anonymous stringer show that the helicopter’s tail features stealth-configured shapes on the boom and the tail rotor hub fairings, swept stabilizers and a “dishpan” cover over a five-or-six-blade tail rotor. It has a silver-loaded infrared suppression finish similar to that seen on V-22s.
See AviationWeek.com/ares for some photographs.
The aircraft was damaged during the mission and abandoned. The mission team destroyed most of the airframe but its tail section landed outside the wall of the target compound and escaped demolition.
Stealth helicopter technology is not new and was applied extensively to the Boeing/Sikorsky RAH-66 Comanche, cancelled in 2004. Compared with fixed-wing stealth, more emphasis is usually placed on noise and infrared signatures.
Noise can be reduced and made less conspicuous by adding blades to the main and tail rotors. It can also be reduced by aerodynamic modifications and flight control changes that make it possible to reduce rotor rpm, particularly in forward flight below maximum speed. Infrared reduction measures are crucial - the Comanche had an elaborate system of exhaust ducts and fresh-air ejectors in its tailboom.
Radar cross-section (RCS) reduction measures include flattened and canted body sides, making landing gear and other features retractable, and adding fairings over the rotor hubs. It usually is not possible to achieve the same - you can’t make a helo as radar-stealthy as a fixed-wing airplane, but helicopters generally operate at low altitude in ground clutter. Reducing RCS also makes jamming more effective, whether from the aircraft itself or from a standoff jammer.
UH-60M File Photo: Sikorsky