r/worldbuilding May All Be Well 1d ago

Spacefaring Garments Visual

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u/guitarenthusiast1s 1d ago

doesn't look rigid enough to be suitable in a pressure-differential environment.

what are the shoulder and knee joint mechanisms? it doesn't look like there are any.

it looks like it would turn into a balloon in a vacuum

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u/Street-Conclusion-99 1d ago

Typically, the restrain layer is internal, that’s why it is rare to see in art. Most spacesuits are multi layer anyways, but from a practical standpoint, it keeps you from scuffing or popping the pressurized layer

My main concern would be the lack of overall sheilding, but that can be handwaved away with sci-fi unobtanium (in current times it is several layers of aluminized Mylar, protects from radiation and a little bit from micrometeors)

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u/guitarenthusiast1s 1d ago

I would expect all spacesuits to be multi-layered, but rigid joints are bulky, and it doesn't look like there's any bulk in these around the joints.

unless these are supposed to use some technology that doesn't require rigid joints?

and what kind of shielding are you talking about? ionizing radiation?

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u/Street-Conclusion-99 1d ago

Spacesuits don’t usually have rigid joints, likely for weight reasons. It’s typically a rubber garment strapped together with something called the restraint layer (prevents it from ballooning outwards) this makes it difficult to move in, like inflating a surgical glove before doing surgery, but it’s industry standard for now

In the future we might see a switch to mechanical counter pressure garments, which exert the needed pressure without using an atmosphere (like a tight compression garment), but the tech isn’t quite there yet

Yea the shielding is for ionizing radiation, but also thermal radiation (insulation), but the thin layers stacked on top of each other function as a rudimentary whipple shield to halt micrometeors

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u/guitarenthusiast1s 1d ago

I'm pretty sure the new suits (that were being developed by collins I think?) have rigid joints.

where do you get your info from? have you worked with spacesuits?

also, I don't expect suits to provide any protection from ionizing radiation, I don't think it's possible to meet both mobility and shielding requirements; the physics don't allow it

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u/HeinousTugboat 1d ago

These ones?

They do, in fact, provide some protection against radiation, too.

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u/guitarenthusiast1s 1d ago

yep, those ones; you can see that the torso, hips, and shoulders are rigid. it looks like the elbows are rigid too.

and tissue paper also provides some protection against radiation, but not enough.

ps - I'd like to put a reminder here that rediquette dictates that comments should only be downvoted if they do not contribute to the discussion

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u/HeinousTugboat 1d ago

It will also protect against radiation levels that are 150 times greater than one receives while on Earth.

Pretty solid tissue paper.

For reference, the ISS sees about 30x the radiation of the surface according to the ESA.

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u/guitarenthusiast1s 1d ago

that's not enough for long term cosmic ray exposure or any significant solar event

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u/HeinousTugboat 1d ago

It.. was enough for NASA to accept the proposal? I don't really understand your point.

also, I don't expect suits to provide any protection from ionizing radiation, I don't think it's possible to meet both mobility and shielding requirements; the physics don't allow it

The same suits you referenced do, in fact, provide a decent amount of protection from ionizing radiation. Is it "enough"? Enough for what? A couple hours in open space? A week sleeping in the suit in orbit? Clearly the ones you referenced provide enough protection for Moonwalks.

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u/guitarenthusiast1s 1d ago

yep, exactly.

they're fine for spacewalks on the order of hours (which is true for pretty much any space suit)

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u/HeinousTugboat 1d ago

Okay, and OP's suits are explicitly for short exposures and primarily ship-internal usage. So.. the amount of shielding the AxEMUs have would be fine.

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u/guitarenthusiast1s 1d ago

agreed, I'm not the one who had an issue with "the lack of overall sheilding".

that would be /u/Street-Conclusion-99

as expressed here

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u/HeinousTugboat 1d ago

As I quoted a moment ago, you asserted that physics don't allow it. Clearly they do. That's all. Street-Conclusion-99 even mentioned Unobtanium happily being able to bridge the gap, so physics wasn't even really part of the conversation to begin with.

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u/guitarenthusiast1s 23h ago

well, if physics ain't part of the equation then might as well have forcefields and not even need suits

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u/HeinousTugboat 1d ago

ps - I'd like to put a reminder here that rediquette dictates that comments should only be downvoted if they do not contribute to the discussion

It also dictates explaining your edits. :-)

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u/guitarenthusiast1s 1d ago

I did: ps means "post script", ie. an edit