1% (0.01 atm) of the sea level pressure is a bit less pressure than at the SR-71 Blackbird's highest altitudes. If all that atmosphere was 100% oxygen (instead of 21%), would a (sc)ramjet still be able to fly in it? If not, would it be able to fly in it if Earth's gravity was lower?

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    $\begingroup$ Downvoter please explain why -1 so the question may be improved. $\endgroup$
    – Jpe61
    Oct 6 '21 at 10:44
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    $\begingroup$ @mins Alright I rephrased it so that it doesn't sound like more appropriate to space.SE. $\endgroup$
    – Giovanni
    Oct 6 '21 at 11:48
  • $\begingroup$ "This question does not show any research effort [...] or not useful". OP has not demonstrated they made any attempt at answering this question, and I don't see how this question is useful to the broader community. $\endgroup$
    – Sanchises
    Oct 8 '21 at 14:26
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    $\begingroup$ @Sanchises You're right, I made an attempt to ask the question instead. What should I have done to answer it? The question and its answer should be useful to the OP in the first place. $\endgroup$
    – Giovanni
    Oct 8 '21 at 16:47
  • $\begingroup$ Do you mean, would the engine be able to operate, or would the aircraft be able to fly? VTC as unclear. $\endgroup$
    – Ralph J
    Oct 12 '21 at 17:14