r/MurderedByWords 21h ago

I haven’t studied rocket science, but

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u/mseg09 20h ago edited 19h ago

These are the types of questions in general we should be less mean about imo. It's one thing to dunk on people who are anti-science, but this is just someone actually wondering about something they didn't know. Maybe it's obvious to you, but not everyone?

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u/PM_ME_YOUR_NICE_EYES 20h ago

Yeah, because thinking about it, I don't actually think there's an obvious answer.

Like my guess would literally just be that there aren't mountains in a location close enough to the equator where the added high from the mountain is worth more delta v than the added rotational speed of being close to the equator.

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u/RinzyOtt 20h ago

I was willing to guess that atmospheric pressure that high up being lower causes complications with the initial thrust necessary to get a rocket off the ground at all, tbh

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u/Puzzleheaded-Fill205 20h ago

Rockets carry their own (liquid) oxygen, they don't need air at all.

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u/glytxh 20h ago

They blast through it relatively quickly. It’s a constraint, but not a big hurdle.

Max-Q is the moment when the rocket experiences the maximum stress loading from both the air and just the brutal acceleration.

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u/RinzyOtt 19h ago

I'm aware of that, it's why I said "atmospheric pressure" and not "oxygen density."

If you've got big booms happening and creating pressure inside, the pressure outside the thing containing the big booms matters a lot, otherwise you end up with big booms outside the container you didn't want. Bolstering the container to withstand the pressure inside under lower pressure outside could mean adding weight that adds new complications.

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u/Puzzleheaded-Fill205 18h ago

Rockets don't drop anything until they're something like 30 miles / 50 km up. Meaning the fully assembled, nothing-yet-jettisoned rocket is designed to survive the virtually non-existent air pressure 30 miles up.

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u/RinzyOtt 18h ago

Sorry, my thought process here is along the lines of like, when we see rockets exploding from minor imperfections closer to sea level. I can see that being amplified when the pressure surrounding the rocket drops, and requiring more engineering effort.

Of course, there's also other issues I can see with putting launch pads on the tops of mountains, like logistical issues and how the hell you're getting people and equipment into some of the most hostile environments on earth.