h a l f b a k e r yI CAN HAZ CROISSANTZ?
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Better to keep the tent at ambient pressure and use a zeolite-based PSA oxygen concentrator. |
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Of course, they're heavy and require mains electrical power. But don't let that bother you, it's only a matter of dragging several hundred kilos of equipment and a steel-wire armoured cable several thousand metres up a sheer, icy rock face |
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Let us know how that works out for you. |
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Ackshully, a bit of quick math and those machines produce 10x more oxygen than a person (at rest, mind) needs. So, with the addition of a CO2 scrubber, a considerably smaller unit should suffice. |
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This scheme would be great for people who wanted to make the climbing experience more in tents. |
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Compression tests for mountain climbers |
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Cite your source, [Steam]. |
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He's probably thinking of the foot pump model. |
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Yep, [QED]'s link appears to refer to a fully baked-in-
the-bag commercial version of this. |
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The idea could be developed into a useful system for mountain rescue. |
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It's wise for hikers and mountaineers to carry a "bivvy bag" - a thick plastic bag intended to provide emergency windproof and waterproof shelter. |
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For rescue teams, it would be useful to be able to carry something a bit mre effective. |
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The answer would be a sort of cylindrical single-use Zorb; made of heavy gauge plastic sheet, in a dual interleaved layer design, it would protect a victim from wind and rain, and most importantly efficiently insulate the occupant from both the air and contact from the ground. Inflated with a simple hand or foot pump, or a CO2 cartridge, it would quickly provide emergency protection. |
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Think of it as several thin airbeds, layered and rolled into a tube. |
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A hypothermic victim could be placed - bivvy bag and all - inside the device, allowing them to conserve body heat. |
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If an efficient seal were provided for the "lid", the occupant would soon suffocate. |
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I wonder how big a zorb would have to be such that terminal velocity with an occupant inside would not damage the occupant on impact with the ground. Such a zorb could be used for descent, because ascent uses up all the challenge and fun. |
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Very approximately, a 6 metre diameter sphere with a total mass 100kg would have a terminal velocity of about 4 m/s, equvalent to a fall of two metres. Given the cushioning effect of the air-filled double wall, that's easily survivable, unless you already have serious injuries; even then, it might only be excruciatingly painful. |
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8/7 - Very approximately, a 6 metre diameter sphere
with a total mass 100kg would have a terminal velocity of
about 4 m/s, equvalent to a fall of two metres. Given the
cushioning effect of the air-filled double wall, that's easily
survivable, unless you already have serious injuries; even
then, it might only be excruciatingly painful. |
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If this is accurate then this sounds like a great idea for
paratroopers, like Mars lander tech here on Earth. |
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//sounds like a great idea for paratroopers// |
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Not really. Once the sphere is inflated (or if you exit
the aircraft with it already inflated), you have no
directional control. In contrast, a square 'chute is
effectively a personal glider with a fairly decent
glide slope and high manoeuverability. |
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Clearly what's needed is the zorb plus a catapult to assure your climber doesn't get hung up on the mountain on the way down. For greater flinging capacity the zorb need not be inflated until the person to be conveyed is some distance away. |
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... thus ensuring that apart from their injuries and any other medical issues, they are also in serious need of a shower and a change of underwear. |
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/Once the sphere is inflated (or if you exit the aircraft with it already inflated), you have no directional control/ |
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It should be possible to control the ball by putting English on it. People can roll about in zorbs by walking up the inner circle, causing the outer to roll. In freefall, it should be possible to rapidly spin the relatively light outer sphere with a motor which pushes off against the comparative massive inner sphere (with rider), thus changing the trajectory of the slowly falling zorb. |
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The Magnus effect <link> will certainly deliver steering impulse, but will demand a sophisticated inertial guidance platform, fast-acting drives, and an energy source. Keeping the core level while rotating the outer shell, where both are composed of thin, flexible material, is non-trivial. |
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Got your energy source right here: a windmill. When a thing is falling it experiences a lot of wind, and tapping that wind for energy would slow the fall even more, which would be good. A problem is that making the zorb a toroid with a windmill in the center would displace the rider, who presumably would be safest in the center. Maybe they can learn to get along? |
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/sophisticated hoo-haw/
There will be a driver instead. If something is going too much one way, the driver will go the other way until the too much is cancelled out, then back off on the other way part. |
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