[Space] Tether string issue

Christopher Lincoln cclinco at gmail.com
Tue Apr 6 13:42:20 PDT 2010


Brian, can you pick up 300 feet of it?

Christopher

On Tue, Apr 6, 2010 at 1:38 PM, meredith scheff <satiredun at gmail.com> wrote:

> 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
>>> >         >>>> _______________________________________________
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>>> >         >>>
>>> >         >>>
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>>> >         >>
>>> >         >
>>> >         >
>>> >
>>> >
>>> >
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>>>
>>
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