[Space] Tether string issue

Brian Choate brian.choate at gmail.com
Tue Apr 6 13:19:51 PDT 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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>         >>
>         >
>         >
>
>
>
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