3 ms·> Partially burned methane The raptors don’t run fuel rich, which should reduce that problem.by mr_toad 5y ago> Partially burned methane The raptors don’t run fuel rich, which should reduce that problem.nautilius 5y agoOh that’s interesting, do you have some more information or a link?ordu 5y agoAccording to the link above they do. Full-flow means to have two pre-burners one going fuel rich while other going oxygen rich. Though I'm not a rocket scientist and I'd be grateful if proven wrong.