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Twin/ Half Ropes
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repete


Apr 2, 2003, 8:58 PM
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Registered: Feb 20, 2002
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Twin/ Half Ropes
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When you buy twin or half ropes is the price listed for one or both of the ropes?


jbrd528


Apr 2, 2003, 9:32 PM
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Registered: Oct 3, 2002
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The price is for one rope. You will pay between $250 and $350 for a twin or half rope set up.


bandycoot


Apr 2, 2003, 9:47 PM
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Registered: Nov 25, 2002
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Twin/ Half Ropes [In reply to]
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Unless you have prodeal... :D

Question, I am considering getting either twin or half ropes. As I understand it, twin you clip them both in each pro and half you clip every other. Which would the experienced recommend? I'm leaning toward twin since it's lighter and I would be using them almost purely on routes that require rappelling and you need two ropes. I prefer using single ropes...

Josh


billburning


Apr 2, 2003, 10:33 PM
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Registered: May 28, 2002
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Double ropes kick ass. What what. But that's just one drunk kids opinion. Go double. Word.


naturalhigh


Apr 2, 2003, 11:15 PM
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Twin/ Half Ropes [In reply to]
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i got my half ropes for about $160... for both...

Edelrid LiveWire 8.3mm Dry 60m... check out mec.ca

gotta love the US dolla when it goes up against the looney! :D


darkside


Apr 3, 2003, 12:21 AM
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Twin/ Half Ropes [In reply to]
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bandycoot: given your stated preferences it would seem that twins would work for you however my preference is for half ropes. To find out more about them check out this info.

naturalhigh: ah yes greenbacks and looneys, Canada may be 30% off to Americans but that is where the "toystore" is. :) Unfortunately the US distributors got upset when they realized someone was undercutting their rip-off prices and now there are some items that can't be shipped directly to the US, mainly climbing gear. Times like these, it's good to know a Canuck or two :roll:


jbrd528


Apr 3, 2003, 6:23 AM
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I have a set of Sterling half ropes. Half ropes have a lower impact forge gernerally around 6kn for 50kg and 7.5kn for 80kg. Twin ropes on the other hand have an impact force generally around 9.5 or 10kn (this is because there is about 15mm of rope going through one piece = 2 7.5mm ropes).
Half ropes are better if you climb alot of alpine routes or routes that wonder alot. Half ropes can greatly help to reduce rope drag by eliminating the zig-zag effect. The other advantage of half ropes is that if you have to you can climb on a single line, although this is not recomended. I have climbed several routes where the aproach was about 2.5 miles. It was and easy route so we decided that climbing on a single half rope would be fine.


geezergecko


Apr 3, 2003, 7:35 AM
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Two 7.5mm ropes have the same cross section area as one 10.6mm rope. 2 x Pi x Radius(double) squared = Pi x Radius(single) squared. Radius(single) = square root of (2 x Radius(double) squared). Two 7.5mm ropes have the same circumference as one 15mm rope. 2 x Pi x Diameter(double) = Pi x Diameter(single). Diameter(single) = 2 x Diameter(double). So two 7.5mm ropes have more sheath but less core than a 11mm single. Of course I could be wrong but that is just my opinion.


jbrd528


Apr 3, 2003, 8:14 AM
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In reply to:
Two 7.5mm ropes have the same cross section area as one 10.6mm rope. 2 x Pi x Radius(double) squared = Pi x Radius(single) squared. Radius(single) = square root of (2 x Radius(double) squared). Two 7.5mm ropes have the same circumference as one 15mm rope. 2 x Pi x Diameter(double) = Pi x Diameter(single). Diameter(single) = 2 x Diameter(double). So two 7.5mm ropes have more sheath but less core than a 11mm single. Of course I could be wrong but that is just my opinion.

Ahh, ok


bandycoot


Apr 3, 2003, 9:41 AM
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Twin/ Half Ropes [In reply to]
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I still have yet to hear from a pro-twin rope person out there... The area calculation may or may not be right, (I'm too lazy to do it) but they DO have higher impact forces. Maybe I should go half...

input still desired!

Josh


darkside


Apr 3, 2003, 9:53 AM
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Here is a contrary view for you in favour of twins. I still prefer half ropes but the more you know, the better informed your decision will be. Even if you decide on halves, it is still something to keep in mind.


bandycoot


Apr 3, 2003, 12:02 PM
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Thank you darkside. That was a great article! The author recommends clipping both half ropes into good pieces, but that means the impact force will be higher than the impact force of twin ropes. I guess there goes that argument against twins... :P

Josh


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