[Space] Tether string issue

meredith scheff satiredun at gmail.com
Tue Apr 6 13:38:04 PDT 2010


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
>> >         >>>> _______________________________________________
>> >         >>>> Space mailing list
>> >         >>>> Space at lists.noisebridge.net
>> >         <mailto:Space at lists.noisebridge.net>
>> >         >>>> https://www.noisebridge.net/mailman/listinfo/space
>> >         >>>
>> >         >>>
>> >         >>> _______________________________________________
>> >         >>> Space mailing list
>> >         >>> Space at lists.noisebridge.net
>> >         <mailto:Space at lists.noisebridge.net>
>> >         >>> https://www.noisebridge.net/mailman/listinfo/space
>> >         >>>
>> >         >>
>> >         >
>> >         >
>> >
>> >
>> >
>> >     _______________________________________________
>> >     Space mailing list
>> >     Space at lists.noisebridge.net <mailto:Space at lists.noisebridge.net>
>> >     https://www.noisebridge.net/mailman/listinfo/space
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> > _______________________________________________
>> > Space mailing list
>> > Space at lists.noisebridge.net
>> > https://www.noisebridge.net/mailman/listinfo/space
>> >
>>
>>
>
> _______________________________________________
> Space mailing list
> Space at lists.noisebridge.net
> https://www.noisebridge.net/mailman/listinfo/space
>
>


-- 
doing stuff and making things
---
"The function of all art ... is an extension of the function of the visual
brain, to acquire knowledge; ...artists are, in a sense, neurologists who
study the capacities of the visual brain with techniques that are unique to
them. ." -Semir Zeki
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.noisebridge.net/pipermail/space/attachments/20100406/2f1422a2/attachment.htm 


More information about the Space mailing list