Re: Future of Orion??

On Wed, 7 Mar 2007 15:12:11 -0600, Greg D. Moore \(Strider\) wrote
(in article <LUFHh.7498$PL.4233@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>):


And don't forget that a capsule has a good chance of bringing a crew home
alive its entry flight control system fails. This was THE requirement
that took NASA from winged vehicles back to capsules during the Orbital
Space Plane program. The entry without flight control requirement has
been watered down now, but a capsule will give the crew a good shot of
surviving a passive entry.

Right up until the parachute fails to open.

Or the de-orbit burn fails.

Or the landing rockets fail to fire.

Or the pressure equalization valve fails somewhere above the stratosphere
with an unsuited crew.

Or toxic chemicals seep into the ECLSS suit loops.

Or the hatch "just blows" when the capsule is bobbing in the ocean . . . ;-

ultimately there are no truly passive systems. Just different re-entry
failures.

Forget the word "re-entry" and I'd agree with you. There are MANY failure
modes in any complex system. Why worry about just the one phase?

--
You can run on for a long time,
Sooner or later, God'll cut you down.
~Johnny Cash

.

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