5 ms·

Create low pressure around the legs, they puff up with blood which means less blood in other parts of the body. If you need a demonstration then google “penis p

Create low pressure around the legs, they puff up with blood which means less blood in other parts of the body. If you need a demonstration then google “penis pump”

lumost 5y ago
Iirc there is a lot of debate on the minimum g level required to avoid negative effects. Spinning people tends to make them uncomfortable and nautious. However, I'd be quite curious if the g level is actually very low. You could have a small gently rotating section of a station.
- dotancohen 5y ago
  > small gently rotating section of a station A small rotating section near the center would have extremely uncomfortable tidal effects. You want to be as far as possible from the fulcrum to reduce the tidal effects.
  - rbanffy 5y ago
    You can probably just lie down and sleep though. The tidal effects would be interesting, but I'm not sure they'd be uncomfortable. Walking would be more difficult, as you'd feel you are about to fall on your face (or back) but I don't think it's something one wouldn't be able to get used to. Wouldn't work with the 4.5 m size limit of the current ISS modules, it's barely doable with a Starship-wide module, but seems totally doable with inflatables. Bigelow was designing 12m+ wide modules and that was a limitation of the rocket fairing that was launching it. With, say, Starship, the module could be much wider.
  - lumost 5y ago
    How fast does it really need to spin? I'm not sure there have been any studies on 1/128g or less. In a 4.5 meter section 1/128g would only be 1 rotation per 30 seconds.
    - dogma1138 5y ago
      The issue is that at the average height of the astronaut the rotation speed at their head would be half of that at their feet given the 4-5m modules we can launch. I don’t know what is the maximum difference that would be tolerable but it’s not 2x for sure. So to get it down to single digit % you are looking at 200M+ or so in diameter. If it’s just for sleeping and liquid pooling at the back won’t pose a health risk then if they are lying down the diameter can be much lower but you are still probably looking at 15-20M which might be possible with inflatable modules I think 3.5-4X expansion would be quite possible with the existing inflatable modules we have.
    - dotancohen 5y ago
      A 4.5 meter section rotating at 1 rotation per 30 seconds would likely suffer very noticeable Coriolis effects.
  - CRConrad 5y ago
    You don't need humongous modules for that. Just take two normal ones and tether them together with a long strong wire.
- rtkwe 5y ago
  The tough part with making it small is the smaller the torus or device the larger the gradient of forces along a riders body which can be disorienting. Any useful G level and comfortable size would likely be larger than any existing module.

Create low pressure around the legs, they puff up with blood which means less blood in other parts of the body. If you need a demonstration then google “penis pump”

lumost 5y ago

Iirc there is a lot of debate on the minimum g level required to avoid negative effects. Spinning people tends to make them uncomfortable and nautious. However, I'd be quite curious if the g level is actually very low. You could have a small gently rotating section of a station.

dotancohen 5y ago
> small gently rotating section of a station A small rotating section near the center would have extremely uncomfortable tidal effects. You want to be as far as possible from the fulcrum to reduce the tidal effects.
- rbanffy 5y ago
  You can probably just lie down and sleep though. The tidal effects would be interesting, but I'm not sure they'd be uncomfortable. Walking would be more difficult, as you'd feel you are about to fall on your face (or back) but I don't think it's something one wouldn't be able to get used to. Wouldn't work with the 4.5 m size limit of the current ISS modules, it's barely doable with a Starship-wide module, but seems totally doable with inflatables. Bigelow was designing 12m+ wide modules and that was a limitation of the rocket fairing that was launching it. With, say, Starship, the module could be much wider.
- lumost 5y ago
  How fast does it really need to spin? I'm not sure there have been any studies on 1/128g or less. In a 4.5 meter section 1/128g would only be 1 rotation per 30 seconds.
  - dogma1138 5y ago
    The issue is that at the average height of the astronaut the rotation speed at their head would be half of that at their feet given the 4-5m modules we can launch. I don’t know what is the maximum difference that would be tolerable but it’s not 2x for sure. So to get it down to single digit % you are looking at 200M+ or so in diameter. If it’s just for sleeping and liquid pooling at the back won’t pose a health risk then if they are lying down the diameter can be much lower but you are still probably looking at 15-20M which might be possible with inflatable modules I think 3.5-4X expansion would be quite possible with the existing inflatable modules we have.
  - dotancohen 5y ago
    A 4.5 meter section rotating at 1 rotation per 30 seconds would likely suffer very noticeable Coriolis effects.
- CRConrad 5y ago
  You don't need humongous modules for that. Just take two normal ones and tether them together with a long strong wire.
rtkwe 5y ago
The tough part with making it small is the smaller the torus or device the larger the gradient of forces along a riders body which can be disorienting. Any useful G level and comfortable size would likely be larger than any existing module.