The Flat Earth Society
Other Discussion Boards => Technology, Science & Alt Science => Topic started by: optimisticcynic on November 02, 2010, 10:24:31 AM

So my friend is a rock climber and is thinking of going rope jumping. this involves tying a rope to to one side of a bridge, having it hang under the bridge and jumping off the other side. he asked me to come up with an equation that describes the max force experienced by the climber. the rope has a linear stretch force. so it has a nice K value. it has a max stretch of 30%. I was wondering what equations you guys could come up with? I came up with two but I made a lot of assumptions to make a nice solvable system.

So my friend is a rock climber and is thinking of going rope jumping. this involves tying a rope to to one side of a bridge, having it hang under the bridge and jumping off the other side. he asked me to come up with an equation that describes the max force experienced by the climber. the rope has a linear stretch force. so it has a nice K value. it has a max stretch of 30%. I was wondering what equations you guys could come up with? I came up with two but I made a lot of assumptions to make a nice solvable system.
Reference: http://www.bungee.com/bzapp/press/pt.html (http://www.bungee.com/bzapp/press/pt.html).

So my friend is a rock climber and is thinking of going rope jumping. this involves tying a rope to to one side of a bridge, having it hang under the bridge and jumping off the other side. he asked me to come up with an equation that describes the max force experienced by the climber. the rope has a linear stretch force. so it has a nice K value. it has a max stretch of 30%. I was wondering what equations you guys could come up with? I came up with two but I made a lot of assumptions to make a nice solvable system.
Reference: http://www.bungee.com/bzapp/press/pt.html (http://www.bungee.com/bzapp/press/pt.html).
slightly more complicated then that since with bungee jumping you jump relatively close to the point the bungee is attached to with rope jumping you are fairly far away from that point which adds up to a lot of swing and a lot more complicated system.
thanks though for the response but I do not believe that the to systems would be interchangeable.

Why would you do this if you value sweet life?

So my friend is a rock climber and is thinking of going rope jumping. this involves tying a rope to to one side of a bridge, having it hang under the bridge and jumping off the other side. he asked me to come up with an equation that describes the max force experienced by the climber. the rope has a linear stretch force. so it has a nice K value. it has a max stretch of 30%. I was wondering what equations you guys could come up with? I came up with two but I made a lot of assumptions to make a nice solvable system.
Reference: http://www.bungee.com/bzapp/press/pt.html (http://www.bungee.com/bzapp/press/pt.html).
slightly more complicated then that since with bungee jumping you jump relatively close to the point the bungee is attached to with rope jumping you are fairly far away from that point which adds up to a lot of swing and a lot more complicated system.
thanks though for the response but I do not believe that the to systems would be interchangeable.
Sorry, but I can't recommend using a regular rope. The chaos of the system could easily cause the equipment to fail at point far above nonchaotic solution. (A twist here and a kink there would mean that link there will snap open.) Bungee resolves the problem with its higher Kvalues. I'd definitely use deadweight tests several times, inspecting the equipment between each test, with a raw egg as a standin for your brain.

Why would you do this if you value sweet life?
Quoting because this is the only possible sane response to this thread.

What the fuck? Like this?
http://gizmodo.com/5164589/ropejumpingthelatestrussiansuicidesport

Why would you do this if you value sweet life?
Quoting because this is the only possible sane response to this thread.

So my friend is a rock climber and is thinking of going rope jumping. this involves tying a rope to to one side of a bridge, having it hang under the bridge and jumping off the other side. he asked me to come up with an equation that describes the max force experienced by the climber. the rope has a linear stretch force. so it has a nice K value. it has a max stretch of 30%. I was wondering what equations you guys could come up with? I came up with two but I made a lot of assumptions to make a nice solvable system.
Reference: http://www.bungee.com/bzapp/press/pt.html (http://www.bungee.com/bzapp/press/pt.html).
slightly more complicated then that since with bungee jumping you jump relatively close to the point the bungee is attached to with rope jumping you are fairly far away from that point which adds up to a lot of swing and a lot more complicated system.
thanks though for the response but I do not believe that the to systems would be interchangeable.
Sorry, but I can't recommend using a regular rope. The chaos of the system could easily cause the equipment to fail at point far above nonchaotic solution. (A twist here and a kink there would mean that link there will snap open.) Bungee resolves the problem with its higher Kvalues. I'd definitely use deadweight tests several times, inspecting the equipment between each test, with a raw egg as a standin for your brain.
we use a rock climbing rope, not a regular rope.
@saddam sort of but we use A. do it one at a time and B. there tends to be a bit more fall before the swing but right idea.