What Constitutes A Combustion Chamber?

We don't 'do' fuel questions, but what about this one? Should it be closed or is it 'innocent' enough? I lean towards accepting it.

Related meta: Why can't I ask my question about amateur space projects and development?

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    $\begingroup$ No offense, but this isn't really about fuel or that dangerous. $\endgroup$ – Putvi May 21 '19 at 17:22
  • $\begingroup$ @Putvi: I had the same concern as Jan when reading the question. If you edit out the "I am thinking of building" part and make it more of a theoretical design question, then it should be fine. $\endgroup$ – DrSheldon May 21 '19 at 17:26
  • $\begingroup$ I mean I'll edit it if you guys want, but people do build these things. $\endgroup$ – Putvi May 21 '19 at 17:27
  • $\begingroup$ @Putvi: I saw your edit, but it didn't quite address the amateur-building-a-rocket issue. I edited the question to make it more suitable. You are welcome to roll the change back, but you might risk other users flagging the question as dangerous. $\endgroup$ – DrSheldon May 21 '19 at 17:39

This question is about how a highly space-related technology works. We answer such questions all the time.

We close questions about how to home-make stuff, most importantly fuel. The question does not ask how you would make a combustion chamber at home. It asks how one works in principle.

I do not see any reason why that question should be closed.

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