[Space] Tether string issue
Brian Choate
brian.choate at gmail.com
Tue Apr 6 20:19:51 UTC 2010
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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