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Why isn't LOX/UDMH used in staged combustion rockets now-a-days?

Could 3D printing be used to achieve perfect grain geometry of solid and hybrid rocket motors?What does “self-pressurizing” mean in regards to propellant tanks?Which is overall more expensive to operate for a final rocket stage? LH2/LOX or hypergolics like UDMH/N2O4?Why is (conventional) ramjet not used for 2nd stage of rocket propulsion?Problems compressing the helium tanks inside the F9 2nd stage LOX tank at the last minute?How do rocket propellant combinations rank in terms of “brightness”?Why doesn't carbon fiber overwrapping in LOX catch fire? (watch this video first)Density of propylene when used as rocket fuel, and advantages (if any) over RP-1?Why is ethylene (ethene) not considered as a rocket fuelHow does the inter-propellant seal works in kerosene/LOX and UDMH/NTO rockets?

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4

$begingroup$

Liquid rockets usually use a propellant pair of fuel and oxidizer. I've seen some rockets from 1960's that used LOX/UDMH as propellant pair but why they are not used any more although it is mentioned that LOX/UDMH has higher performance than N2O4/UDMH but N2O4/ UDMH is used abundantly.

If there are any rockets with LOX/UDMH kindly mention them.

rockets spacecraft lox

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edited 3 hours ago

RonJohn

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add a comment | 

4

$begingroup$

Liquid rockets usually use a propellant pair of fuel and oxidizer. I've seen some rockets from 1960's that used LOX/UDMH as propellant pair but why they are not used any more although it is mentioned that LOX/UDMH has higher performance than N2O4/UDMH but N2O4/ UDMH is used abundantly.

If there are any rockets with LOX/UDMH kindly mention them.

rockets spacecraft lox

share|improve this question

edited 3 hours ago

RonJohn

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asked 16 hours ago

FARRUKH JAVEDFARRUKH JAVED

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FARRUKH JAVED is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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$endgroup$

add a comment | 

$begingroup$

Liquid rockets usually use a propellant pair of fuel and oxidizer. I've seen some rockets from 1960's that used LOX/UDMH as propellant pair but why they are not used any more although it is mentioned that LOX/UDMH has higher performance than N2O4/UDMH but N2O4/ UDMH is used abundantly.

If there are any rockets with LOX/UDMH kindly mention them.

rockets spacecraft lox

share|improve this question

edited 3 hours ago

RonJohn

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asked 16 hours ago

FARRUKH JAVEDFARRUKH JAVED

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FARRUKH JAVED is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|improve this question

edited 3 hours ago

RonJohn

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FARRUKH JAVEDFARRUKH JAVED

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edited 3 hours ago

RonJohn

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edited 3 hours ago

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edited 3 hours ago

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asked 16 hours ago

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1 Answer
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11

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N2O4/UDMH is the choice if you need a non cryogenic storable hypergolic fuel. But UDMH is toxic and carcinogenic and should be avoided if possible. LOX/UDMH is not storable and not hypergolic.

There are a lot other fuels to be combined with LOX and they are not toxic or carcinogenic and thus easier to handle. There are combinations of LOX with higher performance than LOX/UDMH.

share|improve this answer

edited 14 hours ago

answered 16 hours ago

UweUwe

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$endgroup$

• 
  
  
  

  
  14
  

  
  
  
  
  
  

  
  $begingroup$
  LOX/UDMH combines the worst of both worlds: the cooling infrastructure of cryogenic fuels, and the hazards of the storable hypergolics.
  $endgroup$
  – Dohn Joe
  16 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @DohnJoe well said, the worst of both worlds! But there are a lot of combinations of cryogenic LOX with non cryogenic storable fuels.
  $endgroup$
  – Uwe
  16 hours ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  LOX is stored below the freezing point of UDMH, which complicates your design. reddit.com/r/askscience/comments/4acvz2/…
  $endgroup$
  – Hobbes
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The bottom line is that there's always a Very Good Reason why They stopped using this or that high-performance fuel/oxidizer combo. Always.
  $endgroup$
  – RonJohn
  4 hours ago
  

  
  
  
  

add a comment | 

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11

$begingroup$

N2O4/UDMH is the choice if you need a non cryogenic storable hypergolic fuel. But UDMH is toxic and carcinogenic and should be avoided if possible. LOX/UDMH is not storable and not hypergolic.

There are a lot other fuels to be combined with LOX and they are not toxic or carcinogenic and thus easier to handle. There are combinations of LOX with higher performance than LOX/UDMH.

share|improve this answer

edited 14 hours ago

answered 16 hours ago

UweUwe

14.4k22 gold badges3939 silver badges6565 bronze badges

$endgroup$

• 
  
  
  

  
  14
  

  
  
  
  
  
  

  
  $begingroup$
  LOX/UDMH combines the worst of both worlds: the cooling infrastructure of cryogenic fuels, and the hazards of the storable hypergolics.
  $endgroup$
  – Dohn Joe
  16 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @DohnJoe well said, the worst of both worlds! But there are a lot of combinations of cryogenic LOX with non cryogenic storable fuels.
  $endgroup$
  – Uwe
  16 hours ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  LOX is stored below the freezing point of UDMH, which complicates your design. reddit.com/r/askscience/comments/4acvz2/…
  $endgroup$
  – Hobbes
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The bottom line is that there's always a Very Good Reason why They stopped using this or that high-performance fuel/oxidizer combo. Always.
  $endgroup$
  – RonJohn
  4 hours ago
  

  
  
  
  

add a comment | 

11

$begingroup$

N2O4/UDMH is the choice if you need a non cryogenic storable hypergolic fuel. But UDMH is toxic and carcinogenic and should be avoided if possible. LOX/UDMH is not storable and not hypergolic.

There are a lot other fuels to be combined with LOX and they are not toxic or carcinogenic and thus easier to handle. There are combinations of LOX with higher performance than LOX/UDMH.

share|improve this answer

edited 14 hours ago

answered 16 hours ago

UweUwe

14.4k22 gold badges3939 silver badges6565 bronze badges

$endgroup$

• 
  
  
  

  
  14
  

  
  
  
  
  
  

  
  $begingroup$
  LOX/UDMH combines the worst of both worlds: the cooling infrastructure of cryogenic fuels, and the hazards of the storable hypergolics.
  $endgroup$
  – Dohn Joe
  16 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @DohnJoe well said, the worst of both worlds! But there are a lot of combinations of cryogenic LOX with non cryogenic storable fuels.
  $endgroup$
  – Uwe
  16 hours ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  LOX is stored below the freezing point of UDMH, which complicates your design. reddit.com/r/askscience/comments/4acvz2/…
  $endgroup$
  – Hobbes
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The bottom line is that there's always a Very Good Reason why They stopped using this or that high-performance fuel/oxidizer combo. Always.
  $endgroup$
  – RonJohn
  4 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

N2O4/UDMH is the choice if you need a non cryogenic storable hypergolic fuel. But UDMH is toxic and carcinogenic and should be avoided if possible. LOX/UDMH is not storable and not hypergolic.

There are a lot other fuels to be combined with LOX and they are not toxic or carcinogenic and thus easier to handle. There are combinations of LOX with higher performance than LOX/UDMH.

share|improve this answer

edited 14 hours ago

answered 16 hours ago

UweUwe

14.4k22 gold badges3939 silver badges6565 bronze badges

$endgroup$

share|improve this answer

edited 14 hours ago

answered 16 hours ago

UweUwe

14.4k22 gold badges3939 silver badges6565 bronze badges

answered 16 hours ago

UweUwe

14.4k22 gold badges3939 silver badges6565 bronze badges

answered 16 hours ago

UweUwe

14.4k22 gold badges3939 silver badges6565 bronze badges