[Space] Tether string issue
Christopher Lincoln
cclinco at gmail.com
Tue Apr 6 20:42:20 UTC 2010
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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