Author Topic: Knot Bio: Zeppelin bend  (Read 6054 times)

Dan_Lehman

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Re: Knot Bio: Zeppelin bend
« Reply #75 on: December 15, 2017, 02:53:51 AM »
Finding some more interesting words ...
at
 http://www.sandiegouniontribune.com/sdut-airships-1932-visit-sd-brought-tragedy-2009dec05-story.html

Quote
The Akron slowly descended through thick fog until it reached clear skies at 1,200 feet. But the morning sun was expanding the helium, making the ship too buoyant. The captain, Lt. Cmdr. Charles Rosendahl, ordered the propellers turned skyward to push the airship closer to the ground.

At 11 a.m., the 400-foot docking ropes were dropped to the ground between two landing crews of sailors. Each man had to grab a trail rope and attach it to ?spiders,? fixed ground lines with wooden toggles. A separate mooring cable dropped from the nose of the Akron, which was attached the mooring mast. A winch wound the mooring cable, pulling the airship down.

I'm not sure what "cable" means --steel or fibre rope.
The account continues with the sad fatality of some
hangers-on --who eventually couldn't--, and a harrowing
story of the 3rd, who did.

Oh, dear, it's captured on film.
www.youtube.com/watch?v=NHsVcDK42VQ

Anyway, looking at this, I still don't see that one would be
tying on another rope --the landing action is something
anticipated with fully adequate gear.  What seems to be
attached are the sets of man-ropes via toggles (and which
those two unfortunate men were manning).

Egadz, it gets better : close-up (relative) of the survivor
and all the toggles gear (but no filming of the supposed
on-board sailor who was lowered to tie some line to help
stabilize the dangling sailor and by which he was winched
up, later?!) !!
www.youtube.com/watch?v=dsGoRyheOkY


--dl*
====
« Last Edit: December 15, 2017, 03:06:53 AM by Dan_Lehman »

Dan_Lehman

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Re: Knot Bio: Zeppelin bend
« Reply #76 on: December 19, 2017, 02:40:57 AM »
It is interesting to note that both the zeppelin & hunter's bends
came to their more broad popularity at about the same time,
circa 1977.  The latter has an older published-in-book date,
but the influence of that book seems not much better than
that of Bob Thrun's Potomac Caver newletter article re the former,
in 1966!

Currently, to my awareness, it looks as though Geoffrey Budworth's
The Knot Book (1983) might be what crossed the former knot into
more popular knowledge --into books (from 2 magazines and 1
obscure newsletter).


--dl*
====

Dan_Lehman

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Re: Knot Bio: Zeppelin bend
« Reply #77 on: January 13, 2018, 12:29:36 AM »
My reading of this most interesting bit of history
from the pen of CERosendahl himself (!) is that
mooring principally involved lines called "WIRES"
--which I do not see as anything remotely knottable
(whereas "cable" leaves one wondering).
And it seems by this reading, at least, the little knotting
was involved in standard mooring operations; connectors
of a mechanical kind were used, for the main wires.


--dl*
====


[
Popular Science Monthly, March 1930, p.40ff,

             "Flying with an Airship Captain"
   The Veteran Commander of Navy Dirigibles Tells
   of his Experiences in Piloting the Los Angeles

  by Lieutenant Commander Charles E. Rosendahl     
]
.
.
.
"In an attempt to tie to the mooring mast,
rough winds had jerked the ship about so violently
that a nine-sixteenth mooring cable snapped just
in time to save the framework of the ship from damage."
.
.
.
" 'Stand by for Up Ship' ropes are cast off. "
.
.
.
[pp.159-60]

"The Los Angeles provides an impromptu fireworks display
when it lands at a mooring mast.  She carries a Very light pistol,
as possible use as a distress signal, but principally used in the
mooring maneuver.  When the main cable is dropped we fire a white star.
Dropping the starboard yaw wire is accompanied by a green star.
And the port yaw wire by a red one.
This calls attention to the dropping of the wires, which may be
difficult to see, particularly at night.
The ground crew respond with the same lights as they couple
each wire to the corresponding ground wire.  The Very lights
are used both day and night, and the brilliant colored balls are
most easily seen in broad daylight.


[cf (long URLink) ]
https://books.google.com/books?id=HCoDAAAAMBAJ&pg=PA40&lpg=PA40&dq=%22mooring+cable%22+airship+los+angeles+description&source=bl&ots=THldJAf9e3&sig=uwaYZjYiE9YtFLFVZ4dgA1LEh1M&hl=en&sa=X&ved=0ahUKEwiQ-4LLvtPYAhVIY98KHexVD-cQ6AEIVzAM#v=onepage&q=%22mooring%20cable%22%20airship%20los%20angeles%20description&f=false

Popular Science
books.google.com
Popular Science gives our readers the information and tools to improve their technology and their world. The core belief that Popular Science and our readers share: The future is going to be better, and science and technology are the driving forces that will help make it better.


smirnov_wasilii

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Re: Knot Bio: Zeppelin bend
« Reply #78 on: January 14, 2018, 07:12:32 AM »
https://www.youtube.com/watch?v=c_UzV1SWo_s

I came up with this method of binding loop based on the node Zeppelin. It demonstrates the isotopic similarity of the Zeppelin and reef knots.

Я придумал такой способ вязки петли на основе узла Цеппелин. Он демонстрирует изотопическое сходство цеппелина и рифового узлов.

Twine

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Re: Knot Bio: Zeppelin bend
« Reply #79 on: January 16, 2018, 04:50:25 AM »

To kick it off, the first Knot Bio is about the Zeppelin bend.

Link to page: http://www.paci.com.au/knots.php (at #4 in the table)

This is a work-in-progress...and I of course welcome any comments, and constructive feedback.


I am not knowledgeable enough that I can give constructive feedback, but here's my comment anyway: I'm stunned by admiration. Your "Biography" of the Zeppelin knot is most thorough and exhaustive, and what I especially liked about it is that even though you don't shy away from giving much technical detail, you also make it accessible to a layman by explaining all the technical details. Great job!
"Simplicity is the ultimate sophistication" - Leonardo da Vinci

knotsaver

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Re: Knot Bio: Zeppelin bend
« Reply #80 on: January 22, 2018, 07:02:03 PM »

I came up with this method of binding loop based on the node Zeppelin. It demonstrates the isotopic similarity of the Zeppelin and reef knots.


Hi smirnov_wasilii,
your tying method is nice!
You are a magician too!  ;)
I prefer other eyes, but I like your tying method!
Thanks for sharing it.
Ciao,
s.

knot rigger

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Re: Knot Bio: Zeppelin bend
« Reply #81 on: March 21, 2018, 05:43:22 PM »

smirnov_wasilii

your method of tying a zepplin loop is fantastic, thanks for sharing

andy

DerekSmith

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Re: Knot Bio: Zeppelin bend
« Reply #82 on: August 21, 2018, 06:22:26 PM »
@ Mark,

Just found this wonderful bio.  I love the history.

Of course, as you would expect I disagree with your structural and functional analysis, but apart from that, a truly excellent story.

Derek

agent_smith

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Re: Knot Bio: Zeppelin bend
« Reply #83 on: August 22, 2018, 12:52:22 AM »
Derek, you are welcome to disagree as much as you like.

And of course, you are welcome to tender your own theory of how a Zeppelin end-to-end joining knot functions.
EDIT: In fact, you are most welcome to have your theoretical analysis inserted into the paper - and be given credit for any contribution you choose to make.

I am thinking about an update... but at the moment, I am writing an update/revision to my 'Analysis of Bowlines' paper. I have many new images and a rich source of ideas to inject into that paper.
« Last Edit: August 22, 2018, 08:38:54 AM by agent_smith »