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Any way to break Mach 6 with jets?


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the only way I could see it would be using gravity... if you could get into a steep climb at nearly mach 6 at nearly 30km, then your craft may briefly exceed mach 6 on the way down (below 30km, ie below the altitude where your jets cut off during the climb) before the thicker air was enough to counteract gravity.

But I doubt that can work given the terrible TWR you'd be getting at those speeds and altitudes. It gets around the absolute mach 6 propulsion limit, but not other limits

Edited by KerikBalm
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Wouldn't that violate conservation of energy?

Edit... Nevermind, conservation of energy -- mgh -- applies to identical altitudes, but I suppose mach 5.9 @ 20km on the way up = 5.9 @20km on the way down, with acceleration continuing past 20km altitude.

Edited by ExtremeSquared
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It does seem plausible, but the margins on a gravity harvesting dive are extremely tight.
The 9.8m/s^2 is overcome by the extreme difference from terminal velocity at mach6. You're looking at getting 5-6 seconds of it at best before it is outpaced by drag, which is only an extra 0.1-0.2 mach.

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Edited by ExtremeSquared
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