Questions tagged [hypergolics]

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13
votes
1answer
191 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 ...
8
votes
3answers
745 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 ...
18
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 ...
6
votes
3answers
837 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 ...
3
votes
2answers
139 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 ...
1
vote
3answers
578 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?