[Space] Tether string issue
Brian Choate
brian.choate at gmail.com
Tue Apr 6 20:49:21 UTC 2010
And so are you...
On Tue, Apr 6, 2010 at 1:44 PM, Blake Barrett <Blake at blakebarrett.net>wrote:
> 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
>>>>> > >>>> _______________________________________________
>>>>> > >>>> Space mailing list
>>>>> > >>>> Space at lists.noisebridge.net
>>>>> > <mailto:Space at lists.noisebridge.net>
>>>>> > >>>> https://www.noisebridge.net/mailman/listinfo/space
>>>>> > >>>
>>>>> > >>>
>>>>> > >>> _______________________________________________
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>>>>> > >>>
>>>>> > >>
>>>>> > >
>>>>> > >
>>>>> >
>>>>> >
>>>>> >
>>>>> > _______________________________________________
>>>>> > Space mailing list
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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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>>
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>
>
> --
> Blake
> blake at blakebarrett.net
> 1 559 455 7855
>
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