TopBand: Edmund balloons; questions

[Bob Wruble]

try contacting wa7uqv, ron in the seattle area ..... he has a lot
of experience and and sells a baloon kit

73 and seasons best de bob w7gg    ex ai7b 

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> From: Mark Mandelkern <k5am@lascruces.com>
> To: topband@contesting.com
> Subject: TopBand: Edmund balloons; questions
> Date: Monday, December 23, 1996 12:56 PM
> 
> topband@contesting.com
> 
> Edmund balloons; questions
> 
> I've been using the 3 ft Edmund balloons, with
> moderate success - when the wind lets up. These
> are called weather balloons, and are said to be
> designed to burst when they reach a certain altitude.
> I filled one to 4 ft, and it behaved much better in the
> wind. (The lift increases by a factor of  2.37, while
> the wind load area increases by a factor of only
> 1.78.)
> 
> 1. What is the designed bursting altitude?
> 
> 2. What is the designed bursting size?
> 
> 3. What is the safe inflating size?
> 
> 4. I also have an Edmund 8 ft balloon which I haven't
> tried yet. I'll try inflating it to only 5 or 6 ft at first.
> (Compared to 3 ft, at 6 ft the lift increases by a factor
> of  8, while the wind load area increases by a factor
> of only 4.)
>    Has anyone used these 8 ft balloons?
> 
> 5. The simple wind load area calculations ignore the
> balloon shape. Can someone calculate the wind load
> correctly?
> 
> 6. After 2 days aloft, a 3 ft balloon shrunk down to 2
> ft. This is a loss of 70 % of the helium in 2 days. Is
> that normal?
> 
> 7. Are there better balloons available?
> 
> 73,
> 
> Mark, K5AM, DM62ni, k5am@lascruces.com
> 
> Mark Mandelkern      
> Las Cruces, New Mexico, USA 
> 
> 
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