India successfully tested an indigenously-developed hypersonic technology demonstrator vehicle (HSTDV) powered by a scramjet (supersonic-combustion ramjet) engine on September 07, 2020. This test is an essential step towards building next-generation hypersonic cruise missiles.
The latest Sukhoi T-50 prototype, PAK-FA, a twin-engine fifth-generation stealth jet fighter, aborted a takeoff at the recently held MAKS Air Show outside Moscow on 21 August 2011 after four days of successful demo flights. While two prototypes of PAK-FA have cumulatively made 48 flights since 29 January 2010, it will be important to know the reasons for this mishap.