Why hasn't this been made yet? Better than nuclear fallout
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22. Guidance during the drop is an unsolved problem - how do you make flaps that don't burn up?
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4Hypersonics are almost the same thing, it's just that instead of using rocket fuel to wind up the "gravity spring" and then release it later, you just use the rocket fuel to make the thing go fast fast
Imagine a nuclear powered ramjet... You just put a bunch of fuel inside of a tungsten crucible (so it can get very hot) and you launch it with a conventional rocket and once it's doing about mach 1 you blow the control rods out of it and let it run by heating the air...