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What are the reasons Soyuz lifespan on orbit is limited?
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Following the recent Soyuz failure news I found out that currently docked Soyuz expires in the observable future leaving the crew with no means to return back to Earth.
I would like to know what are the reasons behind Soyuz having a limited lifespan on orbit? Does it mean it's not safe to flight it after expiration date or it's not possible at all?
iss crewed-spaceflight soyuz-spacecraft return
asked 2 hours ago
Denis Kulagin
24927
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up vote
3
down vote
favorite
Following the recent Soyuz failure news I found out that currently docked Soyuz expires in the observable future leaving the crew with no means to return back to Earth.
I would like to know what are the reasons behind Soyuz having a limited lifespan on orbit? Does it mean it's not safe to flight it after expiration date or it's not possible at all?
iss crewed-spaceflight soyuz-spacecraft return
asked 2 hours ago
Denis Kulagin
24927
add a comment |Â
up vote
3
down vote
favorite
up vote
3
down vote
favorite
Following the recent Soyuz failure news I found out that currently docked Soyuz expires in the observable future leaving the crew with no means to return back to Earth.
I would like to know what are the reasons behind Soyuz having a limited lifespan on orbit? Does it mean it's not safe to flight it after expiration date or it's not possible at all?
iss crewed-spaceflight soyuz-spacecraft return
asked 2 hours ago
Denis Kulagin
24927
Following the recent Soyuz failure news I found out that currently docked Soyuz expires in the observable future leaving the crew with no means to return back to Earth.
I would like to know what are the reasons behind Soyuz having a limited lifespan on orbit? Does it mean it's not safe to flight it after expiration date or it's not possible at all?
iss crewed-spaceflight soyuz-spacecraft return
iss crewed-spaceflight soyuz-spacecraft return
asked 2 hours ago
Denis Kulagin
24927
asked 2 hours ago
Denis Kulagin
24927
asked 2 hours ago
Denis Kulagin
24927
asked 2 hours ago
Denis Kulagin
24927
asked 2 hours ago
Denis Kulagin
24927
24927
add a comment |Â
add a comment |Â
1 Answer
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Scott Manley answers this question here.
Basically, it is due to the "shelf life" of the hydrogen peroxide propellant used by the attitude control thrusters of the Soyuz descent module. When hydrogen peroxide is passed over a heated catalyst, it decomposes to water and oxygen, and releases lots of energy, so the propellant goes from liquid to steam/gas, providing the thrust. But hydrogen peroxide will also slowly break down spontaneously, so the stored propellant will gradually lose its potency.
The 200 day value is a threshold of safety: decomposition hasn't progressed too far to affect usability of the peroxide propellant to perform a controlled re-entry, landing within a targeted area.
He also goes on to describe the consequences of an uncontrolled (ballistic) re-entry - not a disaster, but definitely undesirable because of G forces imposed on the crew and unpredictability of the actual landing point.
answered 1 hour ago
Anthony X
8,69413273
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
Scott Manley answers this question here.
Basically, it is due to the "shelf life" of the hydrogen peroxide propellant used by the attitude control thrusters of the Soyuz descent module. When hydrogen peroxide is passed over a heated catalyst, it decomposes to water and oxygen, and releases lots of energy, so the propellant goes from liquid to steam/gas, providing the thrust. But hydrogen peroxide will also slowly break down spontaneously, so the stored propellant will gradually lose its potency.
The 200 day value is a threshold of safety: decomposition hasn't progressed too far to affect usability of the peroxide propellant to perform a controlled re-entry, landing within a targeted area.
He also goes on to describe the consequences of an uncontrolled (ballistic) re-entry - not a disaster, but definitely undesirable because of G forces imposed on the crew and unpredictability of the actual landing point.
answered 1 hour ago
Anthony X
8,69413273
add a comment |Â
up vote
3
down vote
Scott Manley answers this question here.
Basically, it is due to the "shelf life" of the hydrogen peroxide propellant used by the attitude control thrusters of the Soyuz descent module. When hydrogen peroxide is passed over a heated catalyst, it decomposes to water and oxygen, and releases lots of energy, so the propellant goes from liquid to steam/gas, providing the thrust. But hydrogen peroxide will also slowly break down spontaneously, so the stored propellant will gradually lose its potency.
The 200 day value is a threshold of safety: decomposition hasn't progressed too far to affect usability of the peroxide propellant to perform a controlled re-entry, landing within a targeted area.
He also goes on to describe the consequences of an uncontrolled (ballistic) re-entry - not a disaster, but definitely undesirable because of G forces imposed on the crew and unpredictability of the actual landing point.
answered 1 hour ago
Anthony X
8,69413273
add a comment |Â
up vote
3
down vote
up vote
3
down vote
Scott Manley answers this question here.
Basically, it is due to the "shelf life" of the hydrogen peroxide propellant used by the attitude control thrusters of the Soyuz descent module. When hydrogen peroxide is passed over a heated catalyst, it decomposes to water and oxygen, and releases lots of energy, so the propellant goes from liquid to steam/gas, providing the thrust. But hydrogen peroxide will also slowly break down spontaneously, so the stored propellant will gradually lose its potency.
The 200 day value is a threshold of safety: decomposition hasn't progressed too far to affect usability of the peroxide propellant to perform a controlled re-entry, landing within a targeted area.
He also goes on to describe the consequences of an uncontrolled (ballistic) re-entry - not a disaster, but definitely undesirable because of G forces imposed on the crew and unpredictability of the actual landing point.
answered 1 hour ago
Anthony X
8,69413273
Scott Manley answers this question here.
Basically, it is due to the "shelf life" of the hydrogen peroxide propellant used by the attitude control thrusters of the Soyuz descent module. When hydrogen peroxide is passed over a heated catalyst, it decomposes to water and oxygen, and releases lots of energy, so the propellant goes from liquid to steam/gas, providing the thrust. But hydrogen peroxide will also slowly break down spontaneously, so the stored propellant will gradually lose its potency.
The 200 day value is a threshold of safety: decomposition hasn't progressed too far to affect usability of the peroxide propellant to perform a controlled re-entry, landing within a targeted area.
He also goes on to describe the consequences of an uncontrolled (ballistic) re-entry - not a disaster, but definitely undesirable because of G forces imposed on the crew and unpredictability of the actual landing point.
answered 1 hour ago
Anthony X
8,69413273
edited 1 hour ago
answered 1 hour ago
Anthony X
8,69413273
answered 1 hour ago
Anthony X
8,69413273
answered 1 hour ago
Anthony X
8,69413273
8,69413273
add a comment |Â
add a comment |Â
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