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Solid Fuel Ducted Ramjet (SFDR) Booster : Missile System

Solid Fuel Ducted Ramjet (SFDR) Booster : Missile System

India successfully flight tested Solid Fuel Ducted Ramjet (SFDR) Booster, a missile system, at the Integrated Test Range (ITR) in Chandipur off the Odisha coast.

  • The Defence Research and Development Organisation (DRDO) began developing SFDR first in 2017 and had conducted successful tests in 2018 and 2019 as well.


  • It is a missile propulsion technology jointly developed by India and Russia.
  • SFDR technology is a missile propulsion system based on the concept of Ramjet Engine principle.
  • A ramjet is a form of air-breathing jet engine that uses the vehicle’s forward motion to compress incoming air for combustion without a rotating compressor.
  • In a ramjet, the high pressure is produced by “ramming” external air into the combustor using the forward speed of the vehicle.
  • The external air that is brought into the propulsion system becomes the working fluid.
  • Ramjets produce thrust only when the vehicle is already moving, ramjets cannot produce thrust when the engine is stationary or static.
  • The system utilises a solid fuelled air-breathing ramjet engine.
  • Unlike solid-propellant rockets, the Ramjet takes up oxygen from the atmosphere during flight.
  • Thus, it is light in weight and can carry more fuel.
  • The SFDR has been developed by Defence Research and Development Laboratory, Hyderabad in collaboration with other DRDO laboratories such as Research Centre Imarat, Hyderabad and High Energy Materials Research Laboratory, Pune.