Author Topic: why your shoelace knot is doomed to fail?  (Read 469 times)

Ruby

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why your shoelace knot is doomed to fail?
« on: April 14, 2017, 03:28:58 AM »

The science behind why your shoelace knot is doomed to fail

No matter how tight you tug, it feels like some shoelaces are doomed to come untied.

Fret no longer, as new research from the University of California, Berkeley,
has figured out the physics behind why the knots fail
and why some shoelaces are more prone to the mistake....

http://www.pbs.org/newshour/rundown/science-behind-shoelace-knot-doomed-fail/


SS369

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Re: why your shoelace knot is doomed to fail?
« Reply #1 on: April 14, 2017, 04:58:18 AM »
Thank you Ruby.

I love science articles about knots.

From the article: "The team acquired a high-speed camera and pointed it at Gregg?s shoes as she ran on a treadmill. Gregg had tied her laces with one of two knots: square (strong) knot or a granary (weak) knot. Here?s how O?Reilly described the difference between the two:"

Everyone knows that a Granary knot is always weak.  ;)

Dan_Lehman

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Re: why your shoelace knot is doomed to fail?
« Reply #2 on: April 18, 2017, 01:13:21 AM »
This makes it sound as though there's a widespread,
inevitable problem with shoe laces --and I've not ever
heard that (and marathon runners don't all wear Velcro
stuff, do they!).

For a surer knot, one can draw down the original bights
onto inserted-within-them 2nd bights which thus act
qua toggles on the originals coming untied.  This can
be done in a sort of swallow-tail orientation (i.e., so
both tails run down the shoe towards the toes, not
one so and one going away).

--dl*
====

deckhandiana

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Re: why your shoelace knot is doomed to fail?
« Reply #3 on: April 25, 2017, 09:25:26 AM »
There was a letter in The UK Times, recently, responding to a letter recommending that the lace be wound round twice clockwise when tying shoelaces.  It said: " ... he omitted the coriolis effect, failing to mention that the method works only in the northern hemisphere.".

I am still trying to work out whether he was serious or not ...


I wish they didn't make sailing shoes with square, leather laces, they are virtually impossible to a. tighten and b. keep done up.   

Diana.