What is the propellant mass for the Soyuz descent module?

Question

I learned some time ago that the Soyuz capsules use hydrogen peroxide as a monopropellant. I'm trying to use this fact for a chemistry question posed to my students, but I cannot find anywhere how much the descent module holds, just that it uses hydrogen peroxide.

What's the propellant mass for the Soyuz descent capsule or what's its tank capacity?

other peroxide chemistry goodies Does the Soyuz spacecraft use chemically stabilized hydrogen peroxide (H₂O₂) to remain ISS-dockable for 200+ days? and Will you be having rubber or wax with your peroxide? (hybrid engine fuel tradeoffs) and Which fuel cell fuels have been demonstrated in space? — uhoh, Feb 13 '22 at 22:33

score 10 · Accepted Answer · answered Feb 13 '22 at 21:02

10

The Soyuz Crew Operations Manual says the system holds between 29.6 and 31.4 kg of peroxide.

It also has a nice schematic of the system.

answered Feb 13 '22 at 21:02

Organic Marble

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Beautiful and timely. Thanks for saving my slides! – Lux Claridge Feb 13 '22 at 21:13

What is the propellant mass for the Soyuz descent module?

1 Answers1