Vehicles which can travel at a speed which is at least 5 times the speed of sound are known as hypersonic vehicles. You can read about the Hypersonic Technology Demonstrator Vehicle (HSTDV) – unmanned scramjet technology of DRDO in the given link.
Further readings:
- Advanced Technology Vehicle – India, one of the 4 Countries To Develop Scramjet Engine
- Reusable Launch Vehicle – Technology Demonstrator (RLV – TD)
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