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CSIR-National Aerospace Laboratories (CSIR-NAL) unveiled three indigenous micro and small gas turbine engines - NJ-05 with 5 kg thrust, NJ-50 with 50 kg thrust and NJ-100 with 100 kg thrust - at the SSB Auditorium, CSIR Headquarters, New Delhi.
The engines are intended for tactical unmanned aerial vehicles, drone interceptors and compact missile systems, addressing a class of propulsion India has largely imported.
The scientific team, led by Shri R. Prathapanayaka, attributed the development to advances in high-RPM turbomachinery and high-temperature combustion technologies.
Air Marshal Tejinder Singh, Chief of Integrated Defence Staff to the Chairman, Chiefs of Staff Committee (CISC), was Chief Guest; Dr N. Kalaiselvi, Director General CSIR and Secretary DSIR, and Dr Abhay A. Pashilkar, Director CSIR-NAL, also spoke.
CSIR-NAL's Director described the laboratory's evolving role as a multi-stage integrator for India's drone ecosystem, and said Indian industry including aerospace start-ups can manufacture these engines at scale.
A gas turbine runs on a continuous cycle: a compressor draws in air and raises its pressure, fuel is burnt in a combustor, and the hot high-pressure gas expands through a turbine that drives the compressor, with the remaining energy leaving as a high-velocity jet that produces thrust. In a turbojet, all the air taken in passes through the core and out of the nozzle - simple, compact and efficient at high speeds, which is why the configuration suits small missiles and fast expendable UAVs. In a turbofan, a large fan at the front pushes most of the air around the core rather than through it; this bypass air produces thrust more efficiently at subsonic speeds and much more quietly, which is why airliners use turbofans. The trade-off is frontal area and complexity, both of which a small UAV can ill afford. Thrust for these small engines is quoted in kilograms-force, as the release does with NJ-05, NJ-50 and NJ-100; large engines such as the Kaveri are quoted in kilonewtons, where one kilogram-force is about 9.8 newtons. Note also what a gas turbine buys over an electric motor and battery: chemical fuel carries far more energy per kilogram than a battery, so range, endurance and speed all improve - which is why interceptors and longer-range loitering munitions use turbines while small quadcopters do not.
Simple Analogy: A turbojet is a narrow hose at full pressure - a thin, very fast stream. A turbofan is a wide fan pushing a large volume of air gently. Both move you forward; the wide slow stream is more efficient at ordinary speeds, the narrow fast one wins when you need speed in a small package.
India's premier civil aviation research laboratory and a constituent unit of CSIR, founded on 1 June 1959 as the National Aeronautical Research Laboratory in Delhi and moved to Bengaluru from March 1960. Its aircraft programmes include the HANSA all-composite two-seat trainer, the SARAS light transport aircraft, the five-seat NM5 developed with Mahindra Aerospace, and current work on a regional transport aircraft and a solar-powered high-altitude platform.
India's largest publicly funded multidisciplinary R&D organisation, established on 26 September 1942, functioning as an autonomous body under the Department of Scientific and Industrial Research (DSIR), Ministry of Science and Technology. The Prime Minister of India is its President.
The DRDO laboratory responsible for design, development and testing of gas turbine engines for military propulsion. It developed the Kaveri engine, which fell short of the thrust-to-weight ratio the Tejas required and was formally delinked from that programme in 2008, with derivative and successor efforts continuing since.
The DRDO laboratory that develops India's unmanned aerial systems, including TAPAS-BH-201 (Rustom-II), the medium-altitude long-endurance UAV that first flew on 16 November 2016 with a demonstrated ceiling of about 28,000 feet, endurance of about 18 hours, a wingspan of 20.6 metres and a payload capacity of 350 kg. The programme also feeds technology into the Archer armed-UAV and Ghatak UCAV efforts.
The tri-service staff organisation for higher defence management, created by a government letter of 23 November 2001 on the recommendations that followed the Kargil Review Committee (set up 29 July 1999 under K. Subrahmanyam, report submitted 7 January 2000) and the Group of Ministers on national security. The post of Chief of Integrated Defence Staff to the Chairman, Chiefs of Staff Committee (CISC) - held by the Chief Guest at this event - was filled from 1 October 2001.
Provide an indigenous, all-composite two-seat trainer for Private Pilot Licence and Commercial Pilot Licence training, replacing imported trainers in India's flying schools.
Key: Developed by CSIR-NAL; the production version was launched on 29 November 2025 at CSIR-NAL, Bengaluru. Manufacture has been transferred to industry partner Pioneer Clean Amps, which is setting up a Rs 150-crore facility at Kuppam, Andhra Pradesh with capacity for up to 100 aircraft a year. The original HANSA first flew on 17 November 1993 and was DGCA-certified in 2000.
Build an indigenous light transport aircraft for regional connectivity and utility roles.
Key: Developed by CSIR-NAL; the original SARAS first flew on 29 May 2004 and is described as India's first indigenously designed and developed civilian aircraft. The 19-seater SARAS Mk-2 has completed its design phase and is moving towards prototype manufacture.
Develop an indigenous afterburning engine for Indian fighter aircraft and reduce dependence on imported military propulsion.
Key: Developed by DRDO's GTRE, Bengaluru. It was formally delinked from the Tejas programme in 2008 after falling short of the required thrust-to-weight ratio, with the aircraft continuing on the General Electric F404; derivative non-afterburning variants and successor development have continued since.
Bar the import of listed defence items after specified timelines so that they must be sourced domestically, creating assured demand for Indian manufacturers.
Key: The Ministry of Defence notified a sixth Positive Indigenisation List of 405 strategically important items with an estimated business potential of about Rs 3,070 crore, comprising 389 items of Defence Public Sector Undertakings and 16 of the Indian Coast Guard. India's defence production reached about Rs 1.51 lakh crore in 2024-25, with DPSUs contributing 71.6 per cent.
Unmanned systems that circle over a target area and strike on command - a category between a missile and a drone, whose economics depend on a propulsion unit cheap enough to be expended, which is exactly the gap small indigenous turbines address.
Countering hostile drones increasingly requires an interceptor that can outrun its target, and speed of that order needs turbine rather than electric propulsion - the NJ-50 and NJ-100 class is aimed at this role.
Engines are the classic long pole in indigenous aerospace: airframes, avionics and radars have been indigenised faster than propulsion, and export controls bite hardest on subsystems that must be replaced repeatedly.
CSIR-NAL is a civil aeronautics laboratory under a civilian ministry, yet is delivering defence propulsion - an illustration of how dual-use research capability crosses the civil-military line.
GS Paper 3 > Science and Technology > Indigenisation of Technology; Security > Defence Technology
General Awareness > Defence Technology and Organisations
General Awareness > Science and Technology, Static GK on Research Institutions
Indigenous aerospace propulsion, DRDO and CSIR laboratory pairings, and UAV programmes recur in defence and general-awareness papers, and in UPSC GS-3 science and technology.
A very small gas turbine engine, in this case rated in tens of kilograms of thrust, used to propel small unmanned aircraft and compact missiles.
A gas turbine in which all intake air passes through the core and exits as a high-velocity jet, favoured for small, fast, compact applications.
A short-to-medium range unmanned aircraft operated in direct support of field formations, as distinct from strategic long-endurance platforms.
Chief of Integrated Defence Staff to the Chairman, Chiefs of Staff Committee - the head of the tri-service HQ IDS, a post filled from 1 October 2001.