[balloon-makers] 21K

Model Balloons - Kasey Blunist_2004 at ballooningmail.com
Sat Oct 26 08:18:27 CDT 2002


Hi Bill and Jon,
Thank you both for the information. I guess I'll go up to something around a 30k. 

I'll check with Don about the fabric.

Thanks again
Kasey

--- "Bill Whelan" <bwhelan at sprint.ca> wrote:
>Hi Casey, and others,,,,
>I have a pattern sheet for a 21,000 cu ft balloon..... you can use it if you
>want.... I had been planning on building a aerostar design.. with long
>goes.....less sewing, I believe, but longer pieces of fabric to deal with.
>
>the 21K is a very small balloon... heat is the most destructive ingredient
>for fabric degradation when we fly..........
>
>the 21k for quick math calculations.... will lift 420lbs ???gross weight at
>250F at sea level at 58F ambient temp....since you live out in the mid west,
>you would only be able to fly on really real cool days.....Try doing a
>calculation for a inside temp of 200/220.... the balloon will not be over
>heated.... you have plenty of room incase you need to recover from a
>decent..........and
>MOST IMPORTATANT... You will need to check the burner flame for length......
>as well as the heat Plume....... you can melt the top out of a small balloon
>with one quick blast... I have seen it done....
>
>I have taken a standard burner and de-tuned the blast to only a few feet and
>cut the BTU down to 4mil.. no problem with over temping the top....
>
>I can do the temp/weight calculation for you if required......
>
>the difference in cost for 21k /30k is only a few dollars...
>
>fly safe,
>land soft
>
>wild bill EH!!!
>
>
>
>your balloon would weight  approx 35lbs+++ burner, + fuel + tank, + seat....
>----- Original Message -----
>From: "Model Balloons - Kasey" <Blunist_2004 at ballooningmail.com>
>To: <balloon-makers at mu.org>
>Sent: Friday, October 25, 2002 11:43 PM
>Subject: [balloon-makers] 21K
>
>
>> I'm planning to finally build a balloon large enough for me to fly under
>it. I think a 21,000 cuft balloon would work well for me as I'm only 120
>lbs.
>>
>>  I would like to use 1.9 oz fabric at least in the upper half to upper 2/3
>of the balloon, and then maybe 1.1 in the lower part, but I'm on a tight
>budget for buying fabric.
>>
>>  I know I can get ist quality 1.9 from Westmark for $2.90 per yard, and
>the 1.1 is $3.60 per yard. But does anyone have any 1.1 oz for less? Any
>color, doesn't really matter to me what the balloons looks like, but if
>anyone has 1.1 up to 1.9 for cheap, please let me know.
>>
>>  Also, does anyone have a gore pattern they would be willing to let me use
>for approx a 21k balloon? I'd like to keep the gores fairly simple with only
>2 or 3 horixontal cuts per gore.
>>
>> Any help or info would be great.
>>
>> ...And Soft Landings For All
>> Kasey
>>
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