[Space] Tether string issue

Brian Choate brian.choate at gmail.com
Tue Apr 6 13:28:04 PDT 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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> >         <mailto:Space at lists.noisebridge.net>
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> >         >>>
> >         >>>
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> >         >>>
> >         >>
> >         >
> >         >
> >
> >
> >
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