DRDO tests Solid Fuel Ducted “Ramjet Technology”

What is the news?

Defence Research and Development Organization (DRDO) successfully flight-tested Solid Fuel Ducted Ramjet (SFDR) technology.

What is Solid Fuel Ducted Ramjet (SFDR)?

  • Developed by: Defence Research and Development Organization (DRDO)
  • Solid Fuel Ducted Ramjet is a missile propulsion system.
  • The system is based on the concept of the Ramjet Engine principle. It utilizes a solid fuelled air-breathing ramjet engine.

Significance of SFDR Technology:

  • The successful demonstration of the technology will enable DRDO to develop long-range air to air missiles. So far such technology is available only with a handful of countries in the world.
  • The technology can also achieve longer ranges as they do not require oxidizers as they take oxygen from the atmosphere.

What is Ramjet?

  • A ramjet is a form of air-breathing jet engine that takes up oxygen from the atmosphere during flight. Thus, it doesn’t require an oxidizer as part of the solid motor.
  • However, ramjet-powered vehicles require an assisted take-off like a rocket. It assists to accelerate it to a speed where it begins to produce thrust.
  • Further, ramjets work efficiently at supersonic speeds around Mach 3 (three times the speed of sound) and can operate up to speeds of Mach 6. But the ramjet efficiency starts to drop when the vehicle reaches hypersonic speeds.


  • The scramjet engine is an improvement over the ramjet engine. It efficiently operates at hypersonic speeds and allows supersonic combustion. Thus, it is known as Supersonic Combustion Ramjet or Scramjet.

Dual Mode Ramjet:

  • A dual-mode ramjet (DMRJ) is a type of jet engine where a ramjet transforms into a scramjet over Mach 4-8 range. It means it can efficiently operate both in subsonic and supersonic combustor modes.

Source: The Hindu

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