[Space] Space Digest, Vol 16, Issue 1

Ian Eyberg ian at clicksaw.com
Fri Mar 18 17:05:04 PDT 2011


sorry disregard that last xls -- for some reason I thought was
gpsls'....

their stuff is located on their website at gpsl.org

- ian

On 16:58 Fri 18 Mar     , Ian Eyberg wrote:
> ehhhh.... idk about that
> 
> 100grams are kinda puny
> 
> if you are wanting to lift 1kg you'd be better off getting a cold
> weather 1kg or 1.2kg+
> 
> you can prob. get a good 200-250grams free lift off of these and they
> prob. won't got higher than 17-18 km (near space can be loosely defined
> as 15km) -- so if you *could* link them together (which I really don't
> have exp. with) -- you'd need 4-5 at those measurements but it doesn't
> scale linerally like that when you take into account ascent rate and so
> forth
> 
> also, if you are looking at doing multiple balloons definitely check out
> the regulations first:
> 
>   http://www.chem.hawaii.edu/uham/part101.html
> 
>   (especially 101.1 (4) && part D)
> 
> check out this xls:
> 
>   http://stevegriffinenterprises.com/balloon-building/tools/74-press-alt-lift.html
> 
> also, you are not looking to go up like a rocket probably.... you want
> an avg ascent rate -- not too fast; not too slow; -- you inflate it too
> much at the beginning your balloon will prob. burst at a lower altitude
> -- prob. not what you want (but іdk)
> 
> for those 100grams you are looking at (of normal inflations) of an ascent
> rate like 250-270 m/min
> 
> - ian
> 
> On 15:06 Fri 18 Mar     , walter park wrote:
> > Thanks Ian.
> > 
> > i read, "To achieve approximately 700 grams of free lift, a 100-gram
> >  balloon  will  take  about  40  cubic feet  of helium. To achieve 900 grams
> > of free lift, a 300-gram balloon will need about 70 cubic feet of helium."
> > 
> > Does that sound right?  If so, lifting a kg requires about 2 100-gram
> > balloons?
> > 
> > 
> > 
> > 
> > 
> > On Fri, Mar 18, 2011 at 12:00, <space-request at lists.noisebridge.net> wrote:
> > 
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> > > Today's Topics:
> > >
> > >   1. hi all! (Ian Eyberg)
> > >
> > >
> > > ----------------------------------------------------------------------
> > >
> > > Message: 1
> > > Date: Thu, 17 Mar 2011 14:38:00 -0700
> > > From: Ian Eyberg <ian at clicksaw.com>
> > > Subject: [Space] hi all!
> > > To: space at lists.noisebridge.net
> > > Message-ID: <20110317213800.GA12991 at mhu>
> > > Content-Type: text/plain; charset=us-ascii
> > >
> > > hey all!
> > >
> > >  I just moved from Missouri and have been interested in diy space
> > > exploration about as long as I've been interested in space in general.
> > >
> > >  I dropped off 40? 100gram weather balloons at the space last Sat/Sun?
> > > -- feel free to get into them (I know they won't go too high or carry
> > > too much payload) but I'm sure the creative minds over there will think
> > > of something awesome to do with them.
> > >
> > >  I'm a bit of a JPAerospace fanboy and almost went to the GPSl last
> > > summer but things got held up. When it comes to space I'm intersted in
> > > more than just balloons though -- pretty much anything besides rockets
> > > (while still cool, they simply can't do what we need).
> > >
> > >  Anyways, hope to meet some of you all soon and participate as well.
> > >
> > > - ian
> > >
> > >
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> > > End of Space Digest, Vol 16, Issue 1
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> > >
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