Eugene Leitl <firstname.lastname@example.org> wrote:
To: email@example.com <firstname.lastname@example.org>
>I know nothing about tethers or orbital towers. However, what is wrong
>with hoisting rockets up to a tethered baloon (10..20 km height), and
>launching them from there?
The vast majority of the energy you spend to attain a stable orbit is in
building up your horizontal velocity relative to the ground, not fighting
gravity to gain 100+km of height.
You CAN launch from a couple km up. But it only buys you a vanishingly small
% of the total energy you have to spend.
Even if we HAD a tower right up to LEO, you would still have to spend approx
80% of the energy (something in this neighborhood anyways) to get from the
top of that tower to a stable orbit at that altitude.
This archive was generated by hypermail 2b29 : Thu Jul 27 2000 - 14:04:25 MDT