Questions tagged [monopropellant]

A propellant that does not require an oxidizer, it can be used alone. An exothermic reaction is started with a catalyst or by heating. Hydrazine is the most common such fuel. New ones are in development.

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6
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2answers
425 views

Is Landsat-7's propellant resupply port “robot-ready”? (Restore-L mission)

update 2020-11-20: OSAM-1 (Formerly Restore-L) Continues to Make Progress, Fuel Tank Installed note: the recent 2019 news Northrop's satellite refueling spacecraft launches on October 9th which is ...
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4answers
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Is LMP-103S truly a viable replacement for Hydrazine?

LMP-103S is the name of a new monopropellant, tested on the PRISMA mission in 2010. It's main ingredient is ADN (Ammonium Dinitramide), a strange chemical invented in the 70's in USSR and ...
5
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1answer
2k views

Would (theoretically) metastable solid metallic hydrogen even need an oxidizer?

In this answer there is discussion of some research on the potential, future use of a solid metallic hydrogen phase that would be metastable at ambient pressure as a rocket propellant. The work is ...
3
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1answer
131 views

Why would it be “less bad” for hydroxylammonium nitrate monopropellant to freeze than for hydrazine?

Answers to Is it bad if hydrazine freezes on a spacecraft? Is it always kept as liquid, or can it be safely allowed to freeze and then thawed when needed? explain that while the freezing of hydrazine ...
3
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1answer
298 views

Is there a derivative of LMP-103S, called LMP-103, that has even higher performance?

I found this PDF while searching for any and all info related to LMP-103S, which you can read more about in my related question. In the PDF, if you scroll down to page 4, you will find a chart ...
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0answers
394 views

How was the Stabilo crewed re-entry vehicle supposed to work? A tractor engine with four nozzles?

ARCA Space's webpage for the Stabilo program has a description and an image. Hydrogen peroxide monopropellant? Reaction closer to the crew than the nozzle? With thrust at the top, it seems that ...
27
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1answer
1k views

What was the result of the propellant predictions in the last chapter of “Ignition!”?

In John D. Clarke's Ignition! (1972), the author spends the last chapter making predictions about the future of liquid rocket propellants. I thought these were very interesting, but I realize the book ...
5
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1answer
557 views

Where are the “World's First Space Engines” now?

From the Wikipedia article Pioneer P-30: At an altitude of about 370 km (230 mi), the first stage separated from the second stage. When the second stage was ignited, telemetry showed abnormal burning,...
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0answers
104 views

How much fuel is left in InSight?

InSight probably landed with some fuel margin. Unless it was vented/burned on landing (maybe not a bad idea considering potential leaks down the road), is there some left ? Do we know the ISP of ...
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3answers
209 views

When would the density Isp product be an important performance metric of a propellant?

The quote NASA is testing hydroxylammonium nitrate in space which is expected to perform 50% better than standard propellants and can be allowed to freeze (hydrazine must be kept liquid). LMP-103S ...
6
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1answer
196 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 ...
5
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What “green” propellant powers Curie, the engine on RocketLab's payload kickstage?

Upon news of RocketLab's successful flight of the Electron launch vehicle, it was announced that not only had they deployed the three onboard payloads into the desired orbit, they had done so using a ...
2
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1answer
118 views

Could New Horizons' thrusters' ISP be as low as 157 sec?

A discussion below How much of a deep space spacecraft's structural mass is useless dead weight after launch? Any plans to shed it in the future? has lead to https://nssdc.gsfc.nasa.gov/nmc/...