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RAPTOR

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Anyone want an obsolete Indian fighter?
By David Nguyen


In March the "Tejas" completed its 500th flight test. Flying at Mach 1.4 and capable of carrying weapons on seven hard points, the Tejas is the flagship in India's long struggle to develop an indigenous light fighter aircraft. But while the technology represents a major achievement for India's aviation industry,
http://www.pakistaniforces.com/forums/questions remain whether the effort is worth the money that is being poured into it.

It is by no means certain that even the Indian Air Force, which needs to replace its aging fleet of Russian-made MiG-21s, will buy the plane over the several other light fighters it could obtain from abroad. Nor are export prospects certain given the glut of superior US, French, Swedish and other light fighter aircraft now on the world's armaments market.

The Light Combat Aircraft (LCA) program began in 1983 out of the rising need to replace the MiG-21s, which even then were becoming obsolete but still constituted the most numerous type of aircraft in the Indian Air Force's inventory. By 1990, the design for a new plane was finalized, with the aircraft adopting a cranked delta wing and tailless configuration powered by a single turbofan engine.

Five years later the designated manufacturer, Hindustan Aeronautical (HAL), unveiled two prototypes. However, because of difficulties with its flight-control system, the aircraft's first test flight was delayed another five years, until January 2001. Since then, two more prototypes have been produced, with a naval variant currently undergoing development.

Yet more than two decades since its conception, the Tejas has yet to reach production status. Instead, it continues to perform endless flight tests. Difficulties with flight controls were eventually resolved, but its power plant, the indigenous Kaveri engine, continues to be plagued with technical difficulties, the worst of which was the collapse of the engine during high-altitude tests performed at a Russian base in 2004.

The Tejas demonstrators and prototypes continue to be powered by a General Electric F404 engine, similar to the one used in the US F/A-18 and the Swedish Gripen. As a result of numerous setbacks with the Kaveri engine, India has began seeking assistance from foreign engine manufacturers, including General Electric, Pratt & Whitney and the French company Snecma.

While difficulties with its power plant could be easily resolved simply by abandoning the local engine and settling on a foreign onet, the Tejas continues to suffer from one key drawback that HAL is unlikely to overcome - its extremely limited airframe. At just 5,500 kilograms and 13 meters long, the Tejas is smaller and lighter than other lightweight aircraft such as the Gripen and the United States' F-16.

Its small size gives the aircraft a smaller radar cross-section, but at the same time limits the amount of fuel (and thus range) and room for additional avionics.

When completed, the Tejas will be comparable to the Gripen in its capabilities. But the Gripen has been operating in Swedish squadrons for nearly a decade and has already seen a new upgraded variant, the Gripen-C, being produced. Similarly, another light combat aircraft, the F-16, has been in service for nearly three decades while offering similar capabilities and numerous upgraded variants.

The capabilities the Tejas offers do not provide anything new or significant over existing light fighters that have already been flying in foreign air forces for years. In short, it is already obsolete.

Rising development costs due to continuing deficiencies in the program will ultimately produce an expensive aircraft that may only be built in limited numbers. India says it intends to export the Tejas, which would offset some of the development costs and lower overall unit costs. However, any exports would have to come after the Indian Air Force has received enough aircraft to replace the aging MiG-21 fleet and would also depend on when the Tejas could actually be produced in large numbers.

Priority in replacing the MiG-21s is high because both Mikoyan-Gurevich and HAL ceased producing new models decades ago. In the export arena, the Tejas will have to compete with established rivals such as the Gripen and both new and used F-16s, which exist in the thousands and will continue be available for export when the F-35 begins replacing them in the US and Europe.

Elsewhere, nations unable to acquire the Swedish or US aircraft because of export restrictions could easily buy the Russian MiG-29 or the larger Su-30, both of which are sold at prices well below their Western counterparts'. Most air forces using the MiG-21 have already begun replacing their fleets with the aforementioned aircraft. There is very little incentive for customers to acquire the Tejas, as better options exist.

While the potential for exports may seem dim for the Tejas, so do the prospects of placing it in service of the Indian Air Force. There is no doubt that the Tejas is superior to the aircraft it is intended to replace; however, the air force generals are not just waiting around until the Tejas comes into full production.

New Delhi should swallow its pride and cancel the program before any more money is wasted. Cancellation should have minimal impact on the air force, as the number of aircraft that will be acquired from the recent bids should be more than enough for MiG-21 replacement. The funding and experience can be applied to India's other ambitious program, the Medium Combat Aircraft. Ultimately, it is up to the government to cut its losses before the Tejas makes its 1,000th "test" flight.

David Nguyen is a University of Hawaii alumnus with a degree in political science and Asian studies.
 
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So...how does one compare the :flag: JF-17:flag: to this "tejas"? If the tejas ever enters service in the iaf in the next 20 or so years.....The JF-17 will be its likely opponent.

Intelligent replies only please. :rolleyes:
 
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read the other similar threads....the replies are there.

mods pls sent this thread to the trash bin....
 
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Light Combat Aircraft-Tejas Testing

Air Marshal P. Rajkumar, PVSM, AVSM, VM (Retd.)

Introduction

Since completion of the technology demonstration phase on March 31, 2004 the LCA program has commenced the Full Scale Engineering Development (FSED) phase in right earnest. The aim of the program now is to achieve Initial Operational Clearance (IOC) with the Multi Mode Radar (MMR) integrated with a weapons suite which will give the aircraft limited operational capability by the end of 2007 i.e. in about three years time. This article will give the reader an insight into the current status of the program while also tracing the evolution of the two Technology Demonstrator aircraft TD-1 and TD-2, and the two Prototype Vehicles PV-1 and PV-2.
TD-1

The first aircraft to be built, TD-1, suffered from all the ills that could beset any aircraft attempting to make a technology leap spanning two decades. It must be remembered that the aircraft industry in Bangalore had not attempted to design and develop a state of the art fighter since the Marut program in the early 60’s of the last century. Almost the entire workforce had their first exposure to new technologies like the fly by wire system, the glass cockpit and the composite structure while manufacturing this aircraft. There was a learning curve involved because most of the workers had to learn on the job. Numerous mistakes were made and the fuselage wing integration had to be done more than once to get things right. It was therefore not very surprising that the aircraft tipped the scales at 6,780 kg with Flight Test Instrumentation (FTI) against a targeted weight of around 6,300kg. Program managers very wisely decided to launch a weight reduction exercise.

TD-1 has the first generation glass cockpit configuration based on an Intel 80386 processor based mission computer and a dedicated display processor to drive the two Active Matrix Liquid Crystal Multi Function Displays (MFD’s) and an imported Sextant Head Up Display (HUD). Redundancy has been provided with a Control and Coding Unit (CCU) and a second display processor. Bharat Electronics designed and developed Multi Function Keyboard (MFK), a Get You Home (GUH) panel which provides the pilot with essential flight information in case of an emergency, a Multi Function Rotary (MFR) switch which enables the pilot to select radio frequencies, set altimeter settings on the HUD, select IFF frequencies, time display etc, a digital fuel and rpm strip gauge, a Function Selection Panel (FSP), a Sensor Selection Panel (SSP) and a BAE Systems SCR-300 Crash Data Recorder (CDR) make up the major part of the avionics suite. Two units developed by the Electronics and Radar Development Establishment (LRDE), the Mission Preparation and Retrieval Unit (MPRU) and the Centralised Warning Panel (CWP) complete the avionics suite.
Communication is provided by a HAL Hyderabad developed INCOM V/UHF R/T set and a standby UHF set.

Four LRUs, the Environmental Control System Controller (ECSC) electronic unit (EU), Digital Fuel Monitoring System (DFM) EU, Engine and Electrical Monitoring System (EEMS) EU and the Digital Hydraulic (DH) EU which also has a brake management computer perform the utilities system monitoring function.

For the first block of flights it was decided to fly the aircraft with a fixed gain control law for the fly by wire system. This meant the control column to control surface deflection law had a fixed linear ratio .The leading edge slats and air brakes were non functional and the aircraft wing tanks were partially refuelled giving a total of 1,800 kg of fuel. Partial fuel in the wing tanks and approximately 140 kg of ballast weight in the nose kept the CG in the mid range. This was done to give the fixed gain control law an adequate margin of safety while stabilising the unstable aerodynamic configuration. The flight envelope was restricted to Mach 0.7,610 kmph Calibrated Air Speed (CAS), 8km altitude and normal acceleration +2g.The GUH was removed and round dial pressure instruments and an angle of attack indicator were fitted to give the pilot unprocessed air data to act as a cross check for the processed information put out by the mission computer. A calibrated chase Mirage 2000 aircraft provided the pilot with a completely independent check of air data and gave him the option of a shepherded landing in case of air data problems .The Mirage 2000 chase aircraft was used for all the 12 flights of the first block.

The almost trouble free completion of the first block flights flown by Wg Cdrs Rajiv Kothiyal and Raghunathan Nambiar between January 4, 2001 and June 2, 2001 did much to boost the confidence of both the designers and the flight test team.

The aircraft was extensively reworked after this phase to make the leading edge slats and airbrakes operational. Some fuel system modifications were also carried out to increase the amount of usable fuel to as high a figure as possible. The full scheduled gain control law wherein the control column to control surface deflection is made dependent on the flight condition of the aircraft was invoked and the aircraft flew again with Gp Capt Rakesh Bhaduria at the controls on February 3, 2003 just in time to be put on static display at Aero India 2003. HAL’s preoccupation with the Intermediate Jet Trainer programme had much to do with this protracted grounding of TD-1.A golden opportunity to fast track the program was thus lost forever.

Once scheduled gains were invoked for the flight control system, envelope expansion was commenced .The flutter envelope was cautiously explored and Wg Cdr Vikram Singh went supersonic in TD-1 for the first time on August 1, 2001.The aircraft has flown 120 flights to date.

TD-2
The air intake duct was redesigned for this aircraft to make it easy to manufacture. Some weight reduction was also attempted which resulted in a weight saving of 110 kg. The airframe weighed 6,670 kg when manufactured.

The other significant change in the aircraft was the installation of the Central Scientific Instruments Organisation (CSIO) Chandigarh designed and developed HUD with 25 x 20 degrees field of view (FOV). The display processor was developed by the Aeronautical Development Establishment (ADE). The HUD is Night Vision Goggles (NVG) compatible. All the round dialled instruments were removed and the GUH was brought into operation. The aircraft originally scheduled to fly by the end of 2001 finally flew on June 2, 2002 with Wg Cdr Tarun Banerjee at the controls. The aircraft flew 61 flights with the fixed gain control law before it was grounded to make the slats and airbrakes operational. The aircraft flew with scheduled gains for the flight control system in October 2003 and has flown 150 flights to date.

PV-1
Major weight reduction was attempted during the manufacture of this aircraft’s airframe. Carbon fibre composites were extensively used in the fuselage taking the overall composite content to 45 per cent by weight and 95 per cent by surface area. The part count, which was 10,000 for TD-1’s airframe, was reduced to 7,000 in this case. The airframe weighed 6,430kg when complete which meant the weight reduction exercise had reduced 350kg of weight, a praise worthy achievement.
PV-1 represents the production standard airframe. Of the structural material used the proportion of carbon composites account for 45 per cent by weight, aluminium alloys 43 per cent, titanium alloys 5 per cent, steels 4.5per cent and other materials 2.5 per cent.
The avionics suite is the same as that of the two TD aircraft. The aircraft first flew on November 25, 2003 with Sqn Ldr Sunit Krishna at the controls and has completed 80 flights to date.

PV-2
There is a big difference between the avionics suite of the first three aircraft and the prototypes from the fourth aircraft PV-2 onwards. The distributed, integrated avionics suite in this aircraft is configured around three dual redundant MIL-STD-1553B data and two dedicated weapons buses. Central data processing is done by the open architecture computer (OAC) which is Power PC/VME64 based. It has a mezzanine card based MIL-STD-1553B, RS422 master and cursive graphics modules. Dual redundant OACs combine the functions of the mission computer, the two display processors, the CCU and the video switching unit replacing five of the LRUs on the Technology Demonstrator aircraft. The OAC has modular software written in the ADA language complying with MIL-STD-1521 and 2167A standards and will be able to generate digital maps without a separate module.

Read full article here http://frontierindia.com/content/view/19/33/

Miro
 
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