[Space] Tether string issue

Blake Barrett Blake at BlakeBarrett.net
Tue Apr 6 13:44:57 PDT 2010


Something particularly funny about the last 2 e-mails is that Brian Choate
and Christoper Lincoln are sitting 3 feet apart from each other while they
are interacting on this thread.

Blake

On Tue, Apr 6, 2010 at 1:42 PM, Christopher Lincoln <cclinco at gmail.com>wrote:

> Brian, can you pick up 300 feet of it?
>
> Christopher
>
>
> On Tue, Apr 6, 2010 at 1:38 PM, meredith scheff <satiredun at gmail.com>wrote:
>
>> anything super bright might help re:visibility, especially fluorescent.
>>
>>
>> On Tue, Apr 6, 2010 at 1:28 PM, Brian Choate <brian.choate at gmail.com>wrote:
>>
>>> If we want to use that cord I can pick up more in any length we need.
>>> There are also other colors available if we care.
>>>
>>> B.
>>>
>>>
>>> On Tue, Apr 6, 2010 at 1:19 PM, Brian Choate <brian.choate at gmail.com>wrote:
>>>
>>>> Actually we have about 150' left if we used around 50' for the last
>>>> launch.
>>>>
>>>> B.
>>>>
>>>> Christopher Lincoln wrote:
>>>> > Actually, we are already using paracord for the fail safe line.  It
>>>> > was that thicker cord that ran from the payload bus strait up the
>>>> > antena to the balloon.  We have about 50 feet or so of it left over
>>>> > from the launch.
>>>> >
>>>> > Christopher
>>>> >
>>>> > On Tue, Apr 6, 2010 at 1:01 PM, Christie Dudley <longobord at gmail.com
>>>> > <mailto:longobord at gmail.com>> wrote:
>>>> >
>>>> >     You know, paracord sound like it's made for the kinds of things
>>>> >     we're doing.  Sounds like just the thing, if not this time, next
>>>> >     time we run out of rope.  Dunno what Meredith has in mind, but I'm
>>>> >     betting it'd be easier to find than the kite string she's looking
>>>> at.
>>>> >
>>>> >     Christie
>>>> >     _______
>>>> >     "We also briefly discussed having officers replaced by very small
>>>> >     shell scripts." -- Noisebridge meeting notes 2008-06-17
>>>> >
>>>> >     The outer bounds is only the beginning.
>>>> >     http://www.flickr.com/photos/genriel/sets/72157623376093724/
>>>> >
>>>> >
>>>> >     On Tue, Apr 6, 2010 at 12:03 PM, David Stainton
>>>> >     <dstainton415 at gmail.com <mailto:dstainton415 at gmail.com>> wrote:
>>>> >
>>>> >         Greetings,
>>>> >
>>>> >         For the ephermerial project I procured a tarred braided
>>>> >         (non-rotational) thick twine from:
>>>> >
>>>> >         Coast Marine
>>>> >         398 Jefferson Street
>>>> >         San Francisco, CA 94133
>>>> >         (415) 673-1923
>>>> >
>>>> >         However you may not need anything that heavy. I think the
>>>> breaking
>>>> >         strength was around 900 pounds.
>>>> >         That is heavy stuff for such a breaking strength. These days I
>>>> use
>>>> >         paracord for almost everything. It comes
>>>> >         in several different varieties. Paracord (parachute cord) has
>>>> >         got a
>>>> >         core of straight fibers surrounded by a braided sheath. It's
>>>> >         thicker
>>>> >         than kite string but thinner than the stuff I got from Coast
>>>> >         Marine.
>>>> >         The kind I purchased from TAD Gear has a breaking strength of
>>>> 550
>>>> >         pounds.
>>>> >
>>>> >         I know for sure that you can get paracord spools (of 100 feet
>>>> >         for about $10) at:
>>>> >
>>>> >         TAD Gear
>>>> >         660 22nd St
>>>> >         San Francisco, CA 94107
>>>> >         (415) 318-8252
>>>> >
>>>> >         But also it is probably sold at various hardware stores: call
>>>> >         them first.
>>>> >
>>>> >         I hope this helps!
>>>> >
>>>> >         ~david
>>>> >
>>>> >         On Tue, Apr 6, 2010 at 11:50 AM, Christie Dudley
>>>> >         <longobord at gmail.com <mailto:longobord at gmail.com>> wrote:
>>>> >         > I don't think super-thin is important.  In fact, I
>>>> >         personally think it's a
>>>> >         > detriment and it's a potential trip hazard problem that
>>>> >         we'll have to solve,
>>>> >         > although I think we should do that regardless of the string
>>>> >         we get.
>>>> >         > The primary problem is we know the string's strength.  NASA
>>>> >         likes these
>>>> >         > numbers.  We've already given them the ones from the kite
>>>> >         string Meredith
>>>> >         > found.  We would have gone with what we already had, if we
>>>> >         could get numbers
>>>> >         > on it for NASA, but nobody could come up with that.
>>>> >         > The secondary problem is every bit of the weight of the
>>>> >         string will be
>>>> >         > adding to the payload.  I personally don't think we'll be
>>>> >         high enough that
>>>> >         > this'll be a problem, but it's not an insignificant concern.
>>>> >         > I really like that stuff that David got for Ephemerisle.
>>>> >          I've cc'd him here
>>>> >         > so maybe he might be able to share with us where he got it
>>>> >         and how much it
>>>> >         > was.  IIRC, it was pretty pricey, but came on a big spool
>>>> >         that we shouldn't
>>>> >         > need.
>>>> >         > Christie
>>>> >         > _______
>>>> >         > "We also briefly discussed having officers replaced by very
>>>> >         small shell
>>>> >         > scripts." -- Noisebridge meeting notes 2008-06-17
>>>> >         >
>>>> >         > The outer bounds is only the beginning.
>>>> >         >
>>>> http://www.flickr.com/photos/genriel/sets/72157623376093724/
>>>> >         >
>>>> >         >
>>>> >         > On Tue, Apr 6, 2010 at 11:27 AM, Brian Choate
>>>> >         <brian.choate at gmail.com <mailto:brian.choate at gmail.com>>
>>>> >         > wrote:
>>>> >         >>
>>>> >         >> Do we specifically want to have something that is very
>>>> >         thin, almost
>>>> >         >> invisible to tether? If that is not super critical we have
>>>> >         ~200 ft of cord I
>>>> >         >> picked up to use as the main payload tether.
>>>> >         >>
>>>> >         >> B.
>>>> >         >>
>>>> >         >> On Tue, Apr 6, 2010 at 9:12 AM, Christie Dudley
>>>> >         <longobord at gmail.com <mailto:longobord at gmail.com>>
>>>> >         >> wrote:
>>>> >         >>>
>>>> >         >>> You might also ask some of the knot/boat enthusiasts.
>>>> >          You're likely to
>>>> >         >>> get a lot more than you wanted to hear with advice, but
>>>> >         they can probably
>>>> >         >>> point you in the right direction.  I think Shannon is on
>>>> >         this list, but also
>>>> >         >>> David knows quite a lot about low-weight high-strength
>>>> >         stuff and where to
>>>> >         >>> get it.  The stuff he got for Ephemerisle might do quite
>>>> >         well for this
>>>> >         >>> application.
>>>> >         >>> Christie
>>>> >         >>> _______
>>>> >         >>> "We also briefly discussed having officers replaced by
>>>> >         very small shell
>>>> >         >>> scripts." -- Noisebridge meeting notes 2008-06-17
>>>> >         >>>
>>>> >         >>> The outer bounds is only the beginning.
>>>> >         >>>
>>>> http://www.flickr.com/photos/genriel/sets/72157623376093724/
>>>> >         >>>
>>>> >         >>>
>>>> >         >>> On Tue, Apr 6, 2010 at 12:31 AM, Michael C. Toren
>>>> >         <mct at toren.net <mailto:mct at toren.net>> wrote:
>>>> >         >>>>
>>>> >         >>>> On Mon, Apr 05, 2010 at 11:25:00PM -0700, meredith scheff
>>>> >         wrote:
>>>> >         >>>> > oh no!
>>>> >         >>>> > I just got an email from the kite string place that i
>>>> >         ordered out
>>>> >         >>>> > tethering
>>>> >         >>>> > line from- they are out of stock.
>>>> >         >>>> > does anyone know any local kite string resources?
>>>> >         >>>>
>>>> >         >>>> High Line Kites in Berkeley is awesome:
>>>> >         >>>>
>>>> >         >>>>    http://www.highlinekites.com/visit_us.shtml
>>>> >         >>>>
>>>> >         >>>> You'll have to wait until Thursday to see him, though.
>>>> >          I'd recommend
>>>> >         >>>> giving him a call at his office number tomorrow, to
>>>> >         confirm he'll have
>>>> >         >>>> what you want, and see if he'll maybe let you come pick
>>>> >         it up earlier.
>>>> >         >>>>
>>>> >         >>>> -mct
>>>> >         >>>> _______________________________________________
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>>>> >         >>>
>>>> >         >>>
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>>>> >         >>>
>>>> >         >>
>>>> >         >
>>>> >         >
>>>> >
>>>> >
>>>> >
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>>>> >
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>>
>>
>> --
>> doing stuff and making things
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>> brain, to acquire knowledge; ...artists are, in a sense, neurologists who
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>> them. ." -Semir Zeki
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-- 
Blake
blake at blakebarrett.net
1 559 455 7855
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