[Space] Tether string issue
Blake Barrett
Blake at BlakeBarrett.net
Tue Apr 6 20:44:57 UTC 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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>>>
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>>
>>
>> --
>> doing stuff and making things
>> ---
>> "The function of all art ... is an extension of the function of the visual
>> brain, to acquire knowledge; ...artists are, in a sense, neurologists who
>> study the capacities of the visual brain with techniques that are unique to
>> them. ." -Semir Zeki
>>
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--
Blake
blake at blakebarrett.net
1 559 455 7855
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