h a l f b a k e r yCogito, ergo sumthin'
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ice rope walking
frigus funambulism - a new circus type skill (apologies in advance for the latin) | |
the goal is to walk barefooted across a strip of ice suspended 60 feet off the ground in a similar fashion to the traditional tightrope between platforms. what shall we say? 1/2” by 1/2” square by 40 feet in length?. it may be necessary to manufacture the ice poles in shorter lengths and fuse together
in situ as I am not sure if you can get iceboxes of the necessary dimensions quite readily.
flavoured ice poles might entice the brave to kneel mid-performance and refresh themselves.
do you think that a 30 pound black pudding would look ridiculous as a balancing pole?
specially engineered ice safety nets would look cool.
as a point of interest: in the 1850s, Jean Francois Gravelet received world acclaim for cooking and eating an omelette (complete with stove and neatly set table) on a high wire stretched over Niagara Falls
ice strength table
http://www.mass.gov/dfwele/dfw/dfwice.htm
... wish I were a mathematician (thanks to Anne who got me through my GSE) [po, Oct 04 2004, last modified Oct 05 2004]
[link]
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Ice is not strong enough. Your beam will need rebar. |
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Also, ice is not flexiable, stretcy, or a high tensile strengh material. So - no ice nets. |
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Whats the physics with the strength of ice? Seems pretty hard to me... My feet are cold though. |
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Hardness and "strength" are not directly related. Specifically, there are four aspects of what is commonly viewed as "strength", though there is no actual definition of "strength" in a material. Anyway, two aspects are hardness and toughness. Hardness is a measure of how much a material resists deforming. Toughness is a measure of it's resistance to "snapping" (materials with very low toughness tend to shatter like glass, while high toughness materials bend and stretch under force). These two are usually inversely proportional, more or less--the harder a material is, the less tough, and vice versa. |
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You've also got tensile vs. compressive strength--how much a material resists being pushed and pulled. If you pull on a rope, that's tensile strength, and if you squeeze a brick, that's compressive strength. |
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Ice has reasonable hardness--nowhere near most metals, but enough that people think of it as "hard". It also has good compressive strength. However, neither of those matter in this application--Ice has terrible toughness and tensile strength, which would be the primary concerns in this application, and because of that this structure will never support its own weight. It'll snap in half unless supported by another material. |
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And, of course, Ice exhibits NONE of the properties that are desireable in a net. |
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There are lots of other properties of materials that could factor into "strength", I've just listed the four biggest and most common ones. |
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[Po], that table is for ice on water. The water underneath supports the ice. |
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How about a simulation using HTPE
coating on the cable and slippers? |
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I know [5th] but it seemed appropriate. how thick would this ice need to be for what length? its a shame this won't work at all because the slipperiness factor seemed interesting to me as well as the coldness to the feet. oh well, back to the drawing board... |
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After it got thick enough, it probably wouldn't support its own weight. |
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Oh, it could work Po, just not with pure ice. As mentioned, if you put some rebar in it or something, it probably could work. I'm currently actually neutral on this one. |
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oh didn't I mention, there was an electrical current running through it :) |
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if it were flavoured (make mine raspberry) it would not be pure... |
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could we use stalactites? |
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why not a Teflon balance beam |
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