TopBand: Edmund balloons; questions
Mon, 23 Dec 1996 16:45:07 -0800
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
> From: Mark Mandelkern <email@example.com>
> To: firstname.lastname@example.org
> Subject: TopBand: Edmund balloons; questions
> Date: Monday, December 23, 1996 12:56 PM
> 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. 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
> 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?
> Mark, K5AM, DM62ni, email@example.com
> Mark Mandelkern
> Las Cruces, New Mexico, USA
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