[AR] Soyuz and HTP (was Re: arocket Digest V11 #72)
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Thu, 20 Apr 2023 23:12:10 -0400 (EDT)
On Fri, 21 Apr 2023, John Dom wrote:
The 90 % HTP (super pure) used as monopropellant for braking the Soyuz
capsules prior/during landing is (or was) produced by EVONIK...
Small correction: the HTP is for attitude control during reentry (notably
roll control to point the capsule's lift vector as desired, for achieving
a relatively precise landing). The landing braking system uses solids.
There are several Soyuz capsules attached to the ISS for station
emergencies. All have HTP aboard. Since the peroxide concentration
diminishes with age I wonder how long it is allowed to stay up there. I
have no idea.
Six months is the nominal stay-time limit, last I heard. This might be
driven by decomposition pressure buildup; I wouldn't think the HTP would
lose strength that quickly.
Henry
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