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Questions tagged [methalox]

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Is an open expander cycle rocket engine driven by a gasified oxygen turbine technically feasible?

Is an open expander (bleed-off) cycle engine that uses the gasified cryogenic oxidizer instead of the gasified fuel to drive the turbo pumps technically feasible? I was thinking of a first stage open ...
Space Otter's user avatar
1 vote
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Could it be more cost-effective to refuel with on the lunar south pole produced methalox instead of refueling methalox in LEO, on the way to Mars?

In the article Prominent volcanic source of volatiles in the south polar region of the Moon it is calculated that 8 x 109 kg $CO_2$ has been vented billions of years ago by pyroclastic events in the ...
Cornelis's user avatar
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What rockets use a methalox propellant?

I’ve found that the SpaceX Raptor rocket engine and the BE-4 rocket engine use methalox (Liquid Methane and Liquid Oxygen), is there any other rocket engines that use a methalox.
Blue Skin and Glowing Red Eyes's user avatar
7 votes
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Tory Bruno mentioned "unsolvable combustion instability" of "large methane engines". What, why, how?

Relevant tweet, an hour ago: https://twitter.com/torybruno/status/1405210138189864960?s=19 a Tweeted Question: Why wasn't methane used in the 2000s, when it was readily available unlike the time ...
Anton Hengst's user avatar
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How does one determine the optimal CH4:O2 ratio in a methane-LOX rocket engine?

The SpaceX Raptor uses a 78:22 O2:CH4 ratio. It also has combustion chamber pressures higher than any other rocket engine ever built. My questions are: What's the math / chemistry that determines ...
Ron Peacetree's user avatar
14 votes
2 answers
1k views

How does SpaceX plan to deal with possible methane buildup around Starship?

Starship is going to be fueled with cryogenic liquid methane. Before launch, the vehicle will spend some time fully loaded on the launchpad. Although methane is lighter than air at normal temperature, ...
WOW 6EQUJ5's user avatar
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Has combustion of premixed LCH4 and LH2 with LOX been investigated for larger rocket engines?

I can only find two papers on blended methane/hydrogen combustion not related to internal combustion engines, and both of those (Mento et al. 2009 and Rosen et al. 2011) are very limited in scope. I ...
Anton Hengst's user avatar
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