Un amico di un mio amico arrampica con corda in kevlar...

[ULTRA_MASSI]

Mi state scoraggiando

Pensavo di usare la fune portante di una funivia....
L'unico inconveniente non è la staticità della corda, ne la difficoltà nei nodi : è che la carrucola è leggermente pesante !
Allora ho alleggerito il tutto lasciando la ruota in metallo e la carcassa in polistirolo...

[M@zzo]

"One possible solution would be to combine kevlar fibers with the nylon fibers. The core of the rope could not be strictly kevlar due to an elongation of only 2.2% (nylon has a 20% elongation). This would not give the necessary "spring" required to arrest a falling climber. However, if kevlar fibers (which are roughly 3.3 times as strong as nylon fibers[DuPont]), were added to the core in a way that allowed for elongation, then the ropes would be a lot tougher than before. In fact, water absorption probably wouldn't be a concern any more due to the increased tensile strength. If the kevlar yarn was wrapped around the nylon core of the ropes in a helical fashion and then covered with the sheath, it is quite possible that the core and mantel would slip(some slippage occurs in a standard rope[Rock and Ice]) and the kevlar would be allowed to extend until stressed. This would increase the strength of the rope, but would cause it to experience torsion during extension. Possible draw backs would be increased cost and a slightly increased linear density. These may be offset by a demand for a more reliable and rugged rope."

Mah...

[pabloj]

"One possible solution would be to combine kevlar fibers with the nylon fibers. The core of the rope could not be strictly kevlar due to an elongation of only 2.2% (nylon has a 20% elongation). This would not give the necessary "spring" required to arrest a falling climber. However, if kevlar fibers (which are roughly 3.3 times as strong as nylon fibers[DuPont]), were added to the core in a way that allowed for elongation, then the ropes would be a lot tougher than before. In fact, water absorption probably wouldn't be a concern any more due to the increased tensile strength. If the kevlar yarn was wrapped around the nylon core of the ropes in a helical fashion and then covered with the sheath, it is quite possible that the core and mantel would slip(some slippage occurs in a standard rope[Rock and Ice]) and the kevlar would be allowed to extend until stressed. This would increase the strength of the rope, but would cause it to experience torsion during extension. Possible draw backs would be increased cost and a slightly increased linear density. These may be offset by a demand for a more reliable and rugged rope."

Mah...

"Your english is better than your italian!!!"
"Denghiù, bat uot ar iù quoting?"

[M@zzo]

"One possible solution would be to combine kevlar fibers with the nylon fibers. The core of the rope could not be strictly kevlar due to an elongation of only 2.2% (nylon has a 20% elongation). This would not give the necessary "spring" required to arrest a falling climber. However, if kevlar fibers (which are roughly 3.3 times as strong as nylon fibers[DuPont]), were added to the core in a way that allowed for elongation, then the ropes would be a lot tougher than before. In fact, water absorption probably wouldn't be a concern any more due to the increased tensile strength. If the kevlar yarn was wrapped around the nylon core of the ropes in a helical fashion and then covered with the sheath, it is quite possible that the core and mantel would slip(some slippage occurs in a standard rope[Rock and Ice]) and the kevlar would be allowed to extend until stressed. This would increase the strength of the rope, but would cause it to experience torsion during extension. Possible draw backs would be increased cost and a slightly increased linear density. These may be offset by a demand for a more reliable and rugged rope."

Mah...

"Your english is better than your italian!!!"
"Denghiù, bat uot ar iù quoting?"

Sorry, te g'ha rasù!
L'ho trovato qui. http://class.et.byu.edu/mfg340/qualityreports/nylon.htm