In reply to Terry Blanton's message of Thu, 14 Apr 2005 14:06:04 -0400: Hi, [snip] >This web page: > >http://www.lr.tudelft.nl/asset/webpage/en/laddermill.php > >says to use dyneema: > >http://www.dsm.com/en_US/html/hpf/home_dyneema.htm [snip] Yes, I slipped up, and used a figure for tensile modulus instead of tensile strength. Tensile strength for kevlar is about 30 times less than tensile modulus, which puts things in a somewhat different light.
Based on the corrected figure, the longest kevlar cord that would sustain it's own weight is only 290 km. For Dyneema that would be about 305 km based on the vague data supplied on their web site, combined with data from http://www.bbriefings.com/pdf/954/DSM_tech.pdf. Consequently, to support a load of 11.5 tonne would require a Dyneema cable with a diameter of 7.7 mm. Regards, Robin van Spaandonk All SPAM goes in the trash unread.
