India Tests Full-Scale Actively Cooled Scramjet Combustor Over 12 Minutes

India’s Defence Research and Development Organisation (DRDO) said its Defence Research & Development Laboratory (DRDL) in Hyderabad carried out a long-duration ground test of a full-scale, actively cooled scramjet combustor on Jan. 9, 2026, recording sustained performance for more than 12 minutes. The test was run at the laboratory’s Scramjet Connect Pipe Test (SCPT) Facility and was described by DRDO and the Ministry of Defence as a major technical milestone for the nation’s hypersonic propulsion programme.

The combustor under test was characterized in official statements as an “Actively Cooled Scramjet Full Scale Combustor,” and the ministry framed the result as validation of both the combustor design and the capabilities of the SCPT facility. DRDO said the achievement “provides a strong foundation for India’s Hypersonic Cruise Missile Development Programme.” Defence Minister Rajnath Singh publicly congratulated DRDO, industry partners and academia for the outcome, and senior DRDO leaders were reported to have acknowledged the teams involved.

Scramjet propulsion, short for supersonic combustion ramjet, allows an air-breathing engine to sustain combustion in supersonic airflow and is a core enabling technology for hypersonic cruise missiles that fly at speeds exceeding Mach 5. Media and ministry statements reiterated that such speeds are often cited as more than 6,100 km/h. An actively cooled combustor is designed to manage the intense thermal loads produced during prolonged high-speed operation by circulating coolant to protect internal structures, making long-duration tests critical to demonstrating durability and real-world viability.

The Jan. 9 test builds on a sequence of DRDL demonstrations in 2025. On April 25, 2025, DRDL conducted a long-duration ground test of a subscale actively cooled combustor with a reported run time of more than 1,000 seconds, and an earlier January 2025 trial logged roughly 120 seconds of sustained operation. DRDO and government accounts emphasized an incremental development path from subscale and short-duration trials to this full-scale, long-duration demonstration.

Officials credited DRDO/DRDL with leading the design and development of both the combustor and the SCPT facility, and public statements noted industry partners contributed to realising the hardware and test infrastructure, though specific private partners were not named in the announcements. The test was presented as reinforcing India’s broader hypersonic portfolio, which public reporting links to projects such as an Extended Trajectory Long Duration Hypersonic Cruise Missile under Project Vishnu, the Dhwani hypersonic glide vehicle, and other technology demonstrators.

Beyond technical validation, the DRDO presentation underscores strategic and industrial implications: developing robust ground-test infrastructure and cooled combustor technology reduces technical risk for flight demonstrations and future weaponisation, while placing India among a small number of countries advancing air-breathing hypersonic propulsion. The long-duration result will likely accelerate planning for flight tests and drive further collaboration between DRDO, industry and academia as India moves to mature hypersonic cruise missile capabilities.