[Space] Space Digest, Vol 16, Issue 1

Ian Eyberg ian at clicksaw.com
Fri Mar 18 16:58:14 PDT 2011


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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> >   1. hi all! (Ian Eyberg)
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> > ----------------------------------------------------------------------
> >
> > 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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