Source: PIB
Subject: Science and Technology
Context: Defence Research and Development Organisation (DRDO) successfully demonstrated Solid Fuel Ducted Ramjet (SFDR) technology from Integrated Test Range, Chandipur.
About Solid Fuel Ducted Ramjet (SFDR) Technology:
What is it?
- SFDR is an air-breathing propulsion system for missiles that uses atmospheric oxygen for combustion and solid fuel burned in a controlled manner to provide sustained thrust at supersonic speeds.
- Unlike conventional rockets, it maintains high energy throughout flight—especially in the terminal phase.
Developed by: Defence Research and Development Organisation (DRDO)
How it works?
- Initial acceleration: A nozzle-less ground booster propels the missile to the required Mach number.
- Ramjet takeover: Once sufficient speed is reached, atmospheric air is ingested and compressed by forward motion (no rotating compressors).
- Controlled combustion: Solid fuel burns steadily inside the duct as air flows through, regulated by a fuel flow controller.
- Sustained thrust: Continuous thrust keeps the missile fast and manoeuvrable till impact.
Key features
- Air-breathing propulsion: Uses atmospheric oxygen instead of carrying an onboard oxidiser, allowing more space for fuel and extending missile range.
- Sustained high-speed flight: Unlike rocket motors that burn out quickly, SFDR provides continuous thrust, maintaining supersonic speed throughout flight.
- High terminal energy: Retains high velocity in the final phase, increasing impact force and the probability of successfully destroying fast, manoeuvring targets.
- Greater manoeuvrability in end-game: Continuous thrust enables sharp evasive turns near the target, making interception by enemy countermeasures difficult.
- Reduced drag losses and improved range: Optimised airflow and sustained propulsion minimise energy loss, allowing engagement at longer distances.
- Indigenous combustion control at supersonic speeds: Stable fuel-air combustion at high Mach numbers has been successfully mastered domestically, a major technological breakthrough.
Applications:
- Long-range air-to-air missiles (BVRAAMs): Enables fighter aircraft to engage enemy jets from extended ranges while maintaining high kill effectiveness.
- Air superiority and BVR combat advantage: Allows pilots to strike first and disengage safely, shifting the balance in beyond-visual-range aerial warfare.
- Indigenisation of advanced propulsion: Reduces reliance on foreign missile technologies and strengthens India’s self-reliant defence ecosystem under Aatmanirbhar Bharat.
