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Posted to sci.astro:<br /><br />--------------------------------------------------------------------------------<br /><br />From: rgregoryclark@yahoo.com (Robert Clark)<br />Newsgroups: sci.astro,sci.physics,sci.space.policy,sci.materials<br />Subject: Can we now build the space elevator?<br />NNTP-Posting-Host: 151.201.154.19<br />Message-ID: <832ea96d.0408290701.4b861045@posting.google.com /><br /><br />============================================================<br />From: Robert Clark (rgregoryclark@yahoo.com)<br />Subject: Re: beanstalks (was Re: Metallic hydrogen ...) <br />Newsgroups: sci.physics, sci.astro, sci.space.policy, sci.materials,<br />sci.energy<br />Date: 2004-06-09 02:06:53 PST <br /> <br /><br />henry@spsystems.net (Henry Spencer) wrote in message news:<HyzyFx.DIH@spsystems.net>...<br /> /> ... <br /> /> Given that the nanotubes themselves are far thinner than even a one-micron<br /> /> ribbon, any material technology that ties them together into bulky<br /> /> materials should work just as well for such ribbons, with some adjustment<br /> /> in the details of manufacturing. Even such a ribbon *is* a bulky<br /> /> material, when the fibers involved are nanotubes. <br /> /> ...<br /><br /> Tie?<br /> Hmmm. Do you think it might work to tie the ends together of the 20<br />centimeter long nanotubes already produced?<br /> Looking up some links on knots, the knotted ropes always have less<br />strength than the single, unbroken ropes. I confirmed this by testing<br />on sewing thread.<br /> Still it might be interesting to find out how strong they are<br />compared to single nanotubes.<br /><br /><br /> Bob Clark<br />============================================================<br /><br /> Testing with thread confirmed that a break always occurred where two<br />strands were tied together. However, to estimate the strength of a<br />single strand of thread, I wrapped two ends aroun <div class="Discussion_UserSignature"> </div>