Timeline for Maximum acceleration of minimally modified humans in acceleration fluid
Current License: CC BY-SA 4.0
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14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 12, 2023 at 3:46 | comment | added | JBH | @chaseleffers Thanks for making my point. I appreciate it. | |
| Jun 12, 2023 at 3:45 | comment | added | JBH | @BMF The question isn't about freefall.... I don't believe your comments are relevant to the OP's question. | |
| Jun 10, 2023 at 1:17 | vote | accept | chase leffers | ||
| Jun 10, 2023 at 1:15 | vote | accept | chase leffers | ||
| Jun 10, 2023 at 1:17 | |||||
| Jun 8, 2023 at 23:46 | comment | added | BMF | @JBH You feel the acceleration of a centrifuge because the force is being applied mostly to your skeleton and your flesh is dragged along for the ride. In freefall, every particle in your body gets the same gravitational accel. You can whip through a binary pair of inspiraling white dwarfs pulling tens of thousands of gees and not feel a thing (except maybe some tidal forces). | |
| Jun 8, 2023 at 16:07 | comment | added | chase leffers | @Gene, I understand what you're saying. Unfortunately, I think natural acceleration mainly applies when you're falling toward a planet, and usually you want to avoid acceleration in that case. Orbital maneuvers are a great way to slowly increase speed, but they're not really what I'm looking for here. Would you rather spend ten years meandering up to speed, or 10 minutes? | |
| Jun 8, 2023 at 15:59 | comment | added | chase leffers | @JBH, I think the confusion is about how buoyancy and gravity would affect you while submerged in a fluid. In a thought experiment, a ball of blood that's submerged in a fluid of equivalent density would experience no net force, no matter how fast you accelerated. Unfortunately, matching the density of every tissue/fluid within the human body isn't possible, as they have different densities. I'm asking at what acceleration does the differences in density begin to matter within a human body. | |
| Jun 8, 2023 at 15:39 | comment | added | AlexP | @JBH: Gene is indeed on to somethinhg; but the difference is not between external and internal, it is bnetween gravitation and everything else. Acceleration due to gravitation cannot be sensed, either by the body or by any instrument. This specialness of gravitation is what prompted Einstein to develop General Relativity. | |
| Jun 8, 2023 at 13:51 | answer | added | quarague | timeline score: 5 | |
| Jun 8, 2023 at 9:23 | comment | added | JBH | @Gene Your comment doesn't make sense in relation to the OP's question. Gravity is an externally applied force (ignoring the current debate as to whether or not gravity is a force). Can you show us an example of pilots experiencing a centrifuge that didn't feel a thing? Does your observation have any bearing on the issue of using fluids or a gel to moderate the effects of a very real acceleration that every astronaut feels and whether or not the use of such a fluid or gel would help cushion internal organs? | |
| Jun 8, 2023 at 5:22 | comment | added | Gene | Acceleration that affects everything (internal and external) does not stress the body; just like freefall in gravity, you will feel weightless. You could accelerate at a 1000Gs indefinitely in a gravity field and you wouldn't feel a thing (so long as the gradient wasn't too steep to cause undue tidal forces.) It's only when forces are externally applied and thus those forces have to be transferred through your body does acceleration get troublesome. | |
| Jun 8, 2023 at 2:43 | comment | added | JBH | ... affects the outside of the body first, so the fluid can ameliorate its effects. Acceleration affects everything at once (internal and external) just like gravity - and that can't be ameliorated. | |
| Jun 8, 2023 at 2:43 | comment | added | JBH | Immersing someone in a fluid or gel would help them survive higher pressures (e.g., diving underwater), but not really acceleration. Yes, such a fluid or gel would keep the lungs from collapsing - but you can't encapsulate the brain, heart, or any other vital organ. You can't keep blood from being forced to one side of arteries and veins. I doubt using a fluid or gel would improve human tolerance to acceleration more than a few percent - but I'm certainly not an expert. I could be wrong. But pressure ... (*Continued*) | |
| Jun 7, 2023 at 16:43 | history | asked | chase leffers | CC BY-SA 4.0 |