[Space] Tether string issue
Brian Choate
brian.choate at gmail.com
Tue Apr 6 20:28:04 UTC 2010
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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