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Hypersonic designs are ok but to extract most out of it, scremjt engine is required. We already have hypersonic missile like shaurya but HSTDV will be a game changer ss it will be a compact design and will fly in a relativelt depressed trajectory.

ISRO has revealed new scremjet design. May be used in such vehicles.

In my opinion, hybrid vehicles will be the future as the provide highly foel efficient flights at highly cost effective rate. Ramjet and scremjets are very and high efficiency engines.