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Spaceloft XL can reach space - 100 km - in 60 seconds

So I wonder which rockets can reach that limit fastest

Balloon-launched sounding rockets count but separately (from the moment they launch from the baloon)

Rockets launched from a winged vehicle count too.

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    $\begingroup$ Do balloon-launched sounding rockets count? $\endgroup$
    – Organic Marble
    Sep 10, 2020 at 1:18
  • $\begingroup$ Yes they do count $\endgroup$
    – Joe Jobs
    Sep 10, 2020 at 1:33
  • $\begingroup$ Does the time start when the balloon launches or when the rocket lights off from the balloon? $\endgroup$
    – Organic Marble
    Sep 10, 2020 at 1:34
  • $\begingroup$ from the moment they launch from the baloon $\endgroup$
    – Joe Jobs
    Sep 10, 2020 at 3:36
  • $\begingroup$ does a rocket launched from a winged vehicle count? $\endgroup$
    – user20636
    Sep 10, 2020 at 16:04

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I believe the winner in this department is going to be the Sprint missile. While it was not intended to go into space it would be heading up at more than Mach 10, it would reach space if nothing happened to it first. Since it was designed to reach 30km I would think most of them wouldn't burn through the remaining ablator (yes, it had a heat shield for going up) with what little is left of the atmosphere at that point.

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    $\begingroup$ I thought of that one too, but I could not confirm that one ever reached space. $\endgroup$
    – Organic Marble
    Sep 10, 2020 at 12:11
  • $\begingroup$ How quick they can reach 30 km? $\endgroup$
    – Joe Jobs
    Sep 10, 2020 at 16:21
  • $\begingroup$ @JoeJobs The flight time was expected to not exceed 15 seconds--that's not only going up but going sideways also. $\endgroup$
    – Loren Pechtel
    Sep 10, 2020 at 16:31

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