Fw: Re: [TowerTalk] Weather Balloon Source

[Dave Hachadorian]

Here's some useful info from WA7BNM on the subject that I am
forwarding to the reflector, and here's some further analysis:

Bruce says below that two 30" balloons will lift a 160 wire adequately.
That's 28,273 cubic inches of Helium.

My experiment with one 30" balloon, 14,137 cubic inches of
Helium, failed to lift the wire adequately.

One 5 foot balloon, inflated to 50", contains 65,450 cubic inches
of Helium, which should be more than enough to do the job! 

The volume of a sphere is a function of the cube of the radius,
so a slightly bigger balloon carries a lot more Helium.


Dave Hachadorian, K6LL
Big Bear, CA
K6LL@juno.com

--------- Forwarded message ----------
From: Bruce Horn <bhorn@hornucopia.com>
To: Dave Hachadorian <k6ll@juno.com>
Date: Wed, 16 Aug 2000 09:49:12 -0700
Subject: Re: [TowerTalk] Weather Balloon Source
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Hi Dave,

At 09:10 AM 8/16/00 -0600, you wrote:
>I don't know how much lift a 5-footer has.

As I recall, 1 cu ft of helium lifts 1 oz.

I use three 3ft balloons (filled to about 30 inches) to lift a 160m 
vertical made from 18 ga stranded "grounding" wire I bought at home
depot. 
Two balloons will keep it up, so I have one "insurance" balloon.

73 de Bruce, WA7BNM   (bhorn@hornucopia.com)


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