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[–] MaFishTacosDaBombBro 0 points 1 point (+1|-0) ago 

I'm not sure that's possible, unless a rocket were used. Weather balloons can go pretty high, but there is a limit and propellers work less and less the higher you go due to the atmosphere dwindling.

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[–] rhy [S] 0 points 1 point (+1|-0) ago 

Yes, for sub-orbital flight, propellers will no longer cut it. Later versions will have to have rockets, or some other form of propulsion.