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I came across a meme depicting a supposedly oxygen rich, fuel rich, and "engine rich" cycle of rocket engine. However, I'm pretty sure at least one of them is incorrect listing what looks a lot like an RS-25 as "oxygen rich". I'm curious if the the other one there is correct, specifically the "Fuel Rich" one, but I couldn't figure out which type of engine it is. I've cropped just the photo to the engine of interest here:

Rocket engine firing vertically with orange-purple exhaust

Can anyone identify which engine this is? At a minimum, we can rule out anything that's come out in the last 3 years

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    $\begingroup$ I ended up figuring this out purely by chance. After writing up my question (already having tried and failed to search), I threw the cropped image into Google's image search tool, and it immediately came up. I'm not sure why I didn't think of trying that earlier. $\endgroup$ Commented Mar 21 at 3:14
  • $\begingroup$ Makes sense that an image source would find it, those black panels on the nozzle are pretty unique. $\endgroup$ Commented Mar 21 at 11:29
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    $\begingroup$ @OrganicMarble yeah, I just wasn’t expecting success, since I usually only expect to be able to search for an exact match, rather than the original from a cropped or altered image. $\endgroup$ Commented Mar 21 at 17:10

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It turns out that this is a RS-68 engine, which is a hydrolox gas-generator cycle. I think it's a fuel-rich preburner gas-generator, at least. But it's at least not a form of staged combustion cycle like the other two from the meme.

full photo of RS-68 engine from Wikipedia, from which the photo in the question was cropped

Found here: https://commons.wikimedia.org/wiki/File:RS-68_rocket_engine_test.jpg

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