[Space] Tether string issue
meredith scheff
satiredun at gmail.com
Tue Apr 6 20:38:04 UTC 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
>> > >>>> _______________________________________________
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>> > >>>
>> > >>>
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>> > >>
>> > >
>> > >
>> >
>> >
>> >
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