What we know about SFDR so far?
SFDR, short form for ‘Solid Fuel Ducted Ramjet’ is a propulsion technology different than that of conventional solid fuelled or liquid fuelled missiles. SFDR tech can also be termed as Air Augmented Rockets or Throttleable Ducted Rocket (TDR) or even Variable Flow Ducted Ramjet (VFDR). SFDR tech is currently being employed in Meteor (see Figure 1), a French Active Radar Guided Beyond Visual Range Air-to-Air Missile (BVRAAM) reportedly having a range of 300km, that significantly exceeds the range of any current conventional Air-to-Air missiles (AAM). Realizing what SFDR is capable of, a number of other countries have also started working on this propulsion technology, including India.