Posted on: Jan. 19th, 2006 || www.hindu.com

Put in a nutshell, the organisation has tested the scramjet (supersonic combustion ramjet) technology that uses air moving at supersonic speed (Mach 6) for ignition. The speed of sound is 750 km per second and is called Mach 1. Anything beyond Mach 1 is considered supersonic. Ramjets, on the other hand, use air at subsonic speed (below Mach 1) for ignition.
Joining the elite club
With this, India has joined the elite club comprising a handful of nations that are working on mastering the technology. The U.S., Japan, China, Russia, Australia, and some countries in Europe, according to an ISRO press release, are working on scramjet technology. But none, except the U.S., has tested it in an experimental flight.

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