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Old March 5th 07, 03:16 AM posted to sci.space.history,sci.space.policy,sci.space.station,sci.space.shuttle
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Default The 100/10/1 Rule.

On Mar 4, 8:39?pm, Sylvia Else wrote:
Frogwatch wrote:
On Mar 4, 11:28 am, "Frogwatch" wrote:
BTW, why ssto, wouldnt tsto give better payload ratio?


It's all about the overall cost of putting payload into orbit. A TSTO
would presumably give a better payload ratio, but with extra complexity
(equals dollars) both in the vehicles themselves, and in handling the
vehicles when they're in use. So the net cost per kg in orbit may be
higher for a TSTO than for an SSTO despite the higher payload ratio.

An airliner style operation using a single vehicle per mission is very
attractive if it's achievable. After the vehicle lands, you just refuel
it, put in the next mission's payload and you're ready to launch again.

Sylvia.


well supposedly there was or is a manned DOD launcher that starts as a
airliner, then detaches to optain orbit.

the info was leaked after columbia.

it would of been a alternative return for the crew.