Questions tagged [hypergolics]

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14
votes
1answer
273 views

What is the MXP-351 storable bipropellant?

Masten Space Systems has a proprietary hypergolic bipropellant called MXP-351 intended for use in the XL-1 lunar lander. We seem to know the following information: Non-cryogenic, with storage life of ...
1
vote
3answers
611 views

Is nitrous oxide hypergolic with anything reasonably safe and obtainable?

Can I start an amateur rocket using nitrous oxide as either oxidizer or monopropellant, using a hypergolic slug of something reasonable for use by an amateur rocketeer? What substance could it be?
3
votes
2answers
147 views

Would symmetrical dimethylhydrazine work as a hypergolic fuel?

Hydrazine and its various derivatives have been used as hypergolic fuels. hydrazine monomethylhydrazine (MMH) unsymmetrical dimethyl hydrazine (UDMH) Aerozine 50 is a mixture of 50% hydrazine and ...
19
votes
2answers
1k views

What was the reason to use different fuel for the Apollo Service Module propulsion system and reaction control system?

The Apollo Lunar Module LM used the same fuel/oxidizer combination (Aerozine 50 fuel / nitrogen tetroxide (N2O4) oxidizer) for both descent and ascent stage engines and reaction control system. This ...
8
votes
4answers
1k views

How difficult is it to convert a hypergolic based Moon human lander to a cryogenic one?

Recently a study performed by Aerojet Rocketdyne indicated that in order to achieve a 2024 landing using storable propellants will be required. Given that NASA is looking to reduce program risk in any ...
1
vote
1answer
96 views

Is present-day plumbing technology enough to make refueling of hypergol rockets safe? What about only in space?

Sadly, all of the currently commonly used chemical rocket fuels that are either hypergolic or storable are horribly toxic/corrosive/explosive. RP-1 is so safe you can pour it out of a gas can, but ...
6
votes
3answers
874 views

Exhaust products of hypergolic propellants

On videos of Soyuz docking to ISS we can see exhaust from the control engines (if background is dark enough). For example here Soyuz TMA-19M docked to ISS at ...
5
votes
1answer
161 views

What's up with the lack of subminiature chemical rockets?

Not long ago, I was researching the scaling of converging-diverging de Laval nozzles to subminiature (1.5 mm throat diameter) dimensions for a non-rocket application, and later on studied the ...
8
votes
3answers
751 views

How reliable are pressure fed hypergolic engines?

A fair amount of "what-if" discussion surrounds rocket engine failure at critical points in various crewed missions -- lunar ascent and trans-Earth injection on lunar landing missions, retrorocket ...
4
votes
1answer
215 views

Are there any hypergolic solid/liquid fuel combinations?

Could the principal of hypergolic fuels be applied to hybrid rockets? And if so, are there any known hypergolic solid/liquid combinations?
2
votes
1answer
117 views

Hypergolic Propellant Combination

Is Rocket Grade Hydrogen Peroxide and Liquid Hydrogen a hypergolic propellant combination? I recall, seeing the combination somewhere on the www, however I couldn't retrace the source where I saw it.
6
votes
1answer
174 views

Rocket engine propellant/cycle combinations

I am trying to determine typical relationships between engine mass and performance for various types of engines, so I'm looking for a broad spectrum of examples to extrapolate from. I'm segregating ...
3
votes
0answers
152 views

Hypergolic slugs with gaseous reactants

Based on points raised in this question about hypergolic slugs. My understanding of a hypergolic slug is that it is a solid or a liquid on a paper patch placed in the combustion chamber and it will ...
3
votes
1answer
159 views

Why were hypergolics tanks vented manually?

As I'm reading "Ignition!" I'm finding one point baffling: vapor pressure being such a big deal. Outgassing of both fuels and oxidizers would cause dangerous pressure build-up. The book describes the ...