Delhi-based startup D-Propulse has successfully tested an indigenous 5 kilonewton air-breathing Rotating Detonation Engine at a DRDO facility. This milestone in propulsion technology could improve engine efficiency by 15-25% for drones and missiles. Investors should track the company's progress toward its target of a flight test by December 2027 as it looks to compete with established defense suppliers.
Delhi-based aerospace startup D-Propulse successfully completed ground tests of its air-breathing Rotating Detonation Engine (RDE) at a Defence Research and Development Organisation (DRDO) facility in Hyderabad on July 21-22, 2026. The engine achieved a continuous thrust of 5 kilonewtons. This technology uses controlled, rapid detonations rather than steady combustion, which can allow for lighter and more fuel-efficient propulsion systems compared to traditional jet engines.
Advancing Indigenous Defense Technology
India has historically relied heavily on foreign imports for critical engine components, which often complicates maintenance and long-term upgrades. By developing indigenous RDE technology, D-Propulse aims to provide a domestic alternative for future unmanned aerial vehicles (UAVs), missiles, and tactical aircraft. The engine's design, which integrates an expansion aerospike, is reported to offer an efficiency improvement of 15-25% over conventional engine designs. For the broader defense sector, this reflects a shift toward supporting homegrown startups that can address specific technological gaps, potentially reducing the long-term cost of military modernization.
Startup Funding and Governance
D-Propulse was co-founded by Saurav Jha and former DRDO scientist Dr. V.K. Ramanujachari. The company has secured ₹25 crore in funding from the Indian Angel Network to support its research and development. The board includes former DRDO chief V.K. Saraswat, who serves as chairman, providing the firm with significant technical guidance. The successful test marks an important shift for the startup, which now transitions from laboratory-scale testing to more complex integration phases.
Operational Roadmap and Future Challenges
The company has set a challenging timeline for future development, with a target to conduct an initial flight test by December 2027 and complete military user trials by December 2029. Successfully meeting these targets will be the primary monitorable for the company. While the defense startup space is gaining momentum, similar to the growth observed in the Indian space sector, firms in this field face significant execution risks. These include the difficulty of scaling technology from a controlled ground environment to harsh flight conditions, the high cost of specialized manufacturing, and the stringent certification processes required by defense ministries. Investors and sector observers will watch for the company's ability to maintain its project timeline, secure follow-on funding, and demonstrate the engine's reliability under operational stress during upcoming trials.