Half a croissant, on a plate, with a sign in front of it saying '50c'
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Multi tethered escape velocity assist

107 km long electric tether wire powers electric planes holding wire up and tether pulls at world turning speed
  [vote for,

3 of these wires anchored to one spot, and constant pull upward would prevent the rope from bending down, and would save much energy.

The structure relies only on tensility and would collapse without being continuously pulled up. But still, only a tiny rocket is then needed to send the last stage into space.

Next rockets reach the wire top independently, and reuse it.

pashute, Jan 30 2017

Launch loop https://en.wikipedia.org/wiki/Launch_loop
mentioned in my anno [notexactly, Feb 26 2017]

My idea's better. See anno https://www.youtube...watch?v=J1MAg0UAAHg
notexactly's Launch Loop link explained in a video [pashute, Jan 25 2018]


If the wire was wrapped around a helium-filled tube to make it weightless, it wouldn't need the planes. [+]
Alvin, Jan 30 2017

       If the wire was instead a looped iron pipe of diameter ~50 mm and length ~4 Mm, half of which was covered by another slightly wider non-ferrous pipe, that half of which was arched up to ~80 km above ground, and the other half of which was at ground level, and the entirety of which was pushed along at ~14 km/s by a station at each end, it wouldn't need the planes. It also wouldn't need the rocket until apogee (for circularization/perigee raising). [link]
notexactly, Feb 26 2017

       This idea is better than a launch loop, since it uses tension only, and no length structure. So until some height you would be using much cheaper airlift technology (or even LTA) and once at the top you have a triangular tether to pull you out.
pashute, Jan 25 2018


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