JRS: In article , seen in
news:sci.space.science, Greg D. Moore (Strider)
posted at Sat, 12 Jul 2003 18:09:17 :-

Yes, you do need mass to escape. You can't design a rocket that pushes UP
more than down unless it can eject mass out the back.

Goddard, IIRC, did so.

It mattereth not from where the mass is ejected; only that it be ejected
backwards.

--
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