Prime Minister Narendra Modi on Monday applauded DRDO for successfully test firing hypersonic technology demonstrator vehicle for the first time. In a tweet, the PM said the scramjet engine developed by our scientists helped the flight achieve a speed 6 times the speed of sound. The Defence Research and Development Organisation successfully flight tested the Hypersonic Technology Demonstrator Vehicle from Dr APJ Abdul Kalam Launch Complex at Wheeler Island or HSTDV off the coast of Odisha on Monday. Defence minister Rajnath Singh, too, congratulated the DRDO.