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Jun 2, 2021
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Rahul Malhotra, Ph.D.'s avatar

From your link: “The only propulsion system that can give you hypersonic speeds is a rocket motor. Now rocket motors are not efficient. We know that because otherwise we’d all be flying to outer space. They are very expensive.” Very expensive means one can’t make a whole fleet. But one could make a few prototypes.

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Jun 2, 2021
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Rahul Malhotra, Ph.D.'s avatar

Good point. They are right to be concerned. We will probably know something one way or the other this month.

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