12-24-2020, 07:50 AM | #11 |
Join Date: Aug 2004
Location: traveller
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Re: GURPS O'Neill Cylinder Design
You should probably do something like this in your base design for radiation protection, especially from GCRs over decades-long exposure.
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12-24-2020, 08:26 AM | #12 |
Join Date: Feb 2016
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Re: GURPS O'Neill Cylinder Design
The shielding is included in the 10 billion metric ton figure. The shielding cannot rotate at the same rate as the shell anyway, it is usually made from slag and lacks the structural strength, so it must usually rotate independently. Even at 10 billion metric tons though, the density is 0.0062 grams per cubic centimeter, so it is mostly empty space (47 cm of steel for the shell).
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12-24-2020, 02:04 PM | #13 |
Join Date: Aug 2004
Location: traveller
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Re: GURPS O'Neill Cylinder Design
That works out to ~3.6 t/m2. The 1977 NASA/Stanford study (NASA SP-413) recommended (p. 43-46) a minimum of 4.5 t/m2. If anything, our increasing understanding of radiation hazards in space since then suggests that this is too low, not too high.
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12-24-2020, 02:34 PM | #14 |
Join Date: Feb 2016
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Re: GURPS O'Neill Cylinder Design
Well, the thick atmosphere and the dirt would provide additional shielding. I would personally not mind tripling the mass to provide additional stuff, so SM+23 would not be unreasonable (30 billion metric tons). Anything less than SM+22 would be asking for trouble though.
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12-24-2020, 04:01 PM | #15 |
Join Date: Jul 2007
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Re: GURPS O'Neill Cylinder Design
Put a layer of factory farms under the main land surface. More production, upper land freed for parks, radiation shielding. Yeah you get some mutated crops or animals, but what could go wrong?
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12-24-2020, 05:15 PM | #16 | |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: GURPS O'Neill Cylinder Design
Quote:
In general I would not recommend trying to emulate a classic O'Neill cylinder and instead design an O'Neill-inspired cylindrical habitat, there are some known issues with the classic O'Neill cylinder. |
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12-24-2020, 05:49 PM | #17 | |
Join Date: May 2005
Location: Oz
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Re: GURPS O'Neill Cylinder Design
Quote:
One thing that I recommend not trying to emulate about Island Three is the windows. I calculate that you have to make nearly full used of the strength of steel to support the structure against the centrifugal effect; I don't think it would be practical to either fit windows that bore the radial strain or to support ones that didn't. If you want natural light I think you have to pass it in through the end-caps. Otherwise use artificial light.
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 12-24-2020 at 05:55 PM. |
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12-24-2020, 09:11 PM | #18 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: GURPS O'Neill Cylinder Design
Of course, if you aren't using the windows, there's no good reason for the cylinder design in the first place, you're probably best off with a torus or multi-torus configuration, as that vastly reduces the amount of material strength you need to resist internal pressure.
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12-24-2020, 09:29 PM | #19 | |
Join Date: Aug 2007
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Re: GURPS O'Neill Cylinder Design
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01-02-2021, 11:14 AM | #20 | |
Join Date: Feb 2007
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Re: GURPS O'Neill Cylinder Design
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The classic O'Neil concept of the habitats building power satellites to pay for themselves is of course nonsensical. Solar power sats probably don't make sense on their own terms, and if you're going to build them, you don't need O'Neil habs, you need the space equivalent of a line shack or an oil rig. For comparison, you don't build a chain of mansions on site if you're starting a mine in a remote region, you build efficient living modules or something along those lines, if the workers are lucky, something less if they're not. It's cheaper.
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Tags |
o'neill, o'neill cylinder, oberth cylinder, orbital habitat, space station, spaceships |
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