[Space] Tether string issue

Brian Choate brian.choate at gmail.com
Tue Apr 6 13:49:21 PDT 2010


And so are you...

On Tue, Apr 6, 2010 at 1:44 PM, Blake Barrett <Blake at blakebarrett.net>wrote:

> Something particularly funny about the last 2 e-mails is that Brian Choate
> and Christoper Lincoln are sitting 3 feet apart from each other while they
> are interacting on this thread.
>
> Blake
>
>
> On Tue, Apr 6, 2010 at 1:42 PM, Christopher Lincoln <cclinco at gmail.com>wrote:
>
>> 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
>>>>> >         >>>> _______________________________________________
>>>>> >         >>>> Space mailing list
>>>>> >         >>>> Space at lists.noisebridge.net
>>>>> >         <mailto:Space at lists.noisebridge.net>
>>>>> >         >>>> https://www.noisebridge.net/mailman/listinfo/space
>>>>> >         >>>
>>>>> >         >>>
>>>>> >         >>> _______________________________________________
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>>>>> >         >>>
>>>>> >         >>
>>>>> >         >
>>>>> >         >
>>>>> >
>>>>> >
>>>>> >
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>>>>> >
>>>>> >
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>>>>> >
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>>>>>
>>>>>
>>>>
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>>>
>>>
>>> --
>>> doing stuff and making things
>>> ---
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>
>
> --
> Blake
> blake at blakebarrett.net
> 1 559 455 7855
>
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