[AR] Aw: Re: shuttle SRBs (was Re: Re: Phenolic regression rate)
- From: Nels.Anderson@xxxxxxx
- To: arocket@xxxxxxxxxxxxx
- Date: Fri, 9 Feb 2018 13:58:37 +0100
Gesendet: Donnerstag, 08. Februar 2018 um 21:36 Uhr
Von: "William Claybaugh" <wclaybaugh2@xxxxxxxxx>
In designing an escape system one can not rely on the rocket(s) shutting
down.
I'm struggling a bit with this point, especially since a common liquid failure
mode is shutdown or loss of thrust. If one is really worried about it, how
about a backup shutdown system.
As to the best escape trajectory being off to the side, as long as the crew
capsule is mounted on top, even with a lateral abort trajectory, you're going
to have to outrun the rocket initially. But I see a couple of other problems
here. For one thing, if you want to abort sideways, you're still going to need
one heluvan acceleration if you want to get far enough sideways to avoid
passing through the still-burning booster's exhaust plume. IIRC,
non-survivability of passing through the plume is what led NASA to abandon a
Shuttle abort scenario whereby the SRBs would be let go (not so much the crew
vehicle escaping the rocket, but the rocket escaping the crew vehicle).
The other point is that you can't assume you know which way the booster is
going: a very plausible abort scenario is that the booster has developed
excessive attitude rates.
-- Nels (aka Florin)
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