I don't believe there is a limit on how many launches you can do, I've hear
dof clubs launching 5-10 balloons in a single day. Your problem then is
tracking them all, and having equipment for all of them. Would be better to
integrate as much as possible. Also, you can put multiple systems on one
"launch line". Here's the issue with doing too much: You need a bigger
balloon, and won't get the altitude you want. Take this balloon, which is
nice and hefty sized: http://amzn.com/B00513FWQI . It's 30 feet in
diameter, which means it can lift ~11 lbs. However, with 11 lbs of weight
on it, it will get an altitude of 29,000 meters - MAXIMUM. It will only
lift at 1.2meters/second, which make sit an almost 7 hour flight.
Same balloon, loaded with only 4 lbs? Will go to 34,000 meters.
Same balloon loaded with only 2 lbs? 36,000 meters.
I say we decide on a balloon / desired altitude first, and then try to
build to that / better than that instituting the sensors/devices we want as
we go.
I vouch for the 1200gram, 30ft diameter balloon, going approx 30km up. This
is doable, with a launch rate of 3meters/second, and 2.5 hour fly-time and
a 4000 gram (~8.8lbs) build envelope.. This will get us plenty of altitude,
plenty of equipment in the air, and a short enough flight-time to make it
possible that it lands close to launch, and can be tracked in real-time.
Calculations made with : http://www.cusf.co.uk/calc/
-- Kyle Yankanich
On Mon, Oct 29, 2012 at 4:18 PM, andrew sooy <andrew11
...@gmail.com> wrote:
> is there a limit on to how many launches you can do because i would like
> to to send up other sensors as well to take readings.
> On Mon, Oct 29, 2012 at 4:04 PM, Kyle Yankanich <kyleyankan...@gmail.com>wrote:
>> Dave, it appears that legally speaking we can have a 6lb payload, with up
>> to two (2) separate payloads. That is to say, 12 total lbs of lift So, it's
>> totally possible to use it for a smaller payload, or with multiple
>> balloons, it all depends on how you guys want to take this. I'd personally
>> like to put as many cameras into space as is feasible for us. However, that
>> means more gas, larger balloons, more cost.
>> So, Dave, I guess if we can use that depends on if it's 8 foot inflated,
>> or an 8 foot burst. A balloon that bursts at ~8 ft, is about 4 feet
>> inflated on the ground, which is 10 oz of lift. I believe a 8ft balloon on
>> the ground can lift ~2lbs.
>> BTW, here's the US FAR Regulations for unmanned balloons
>> http://www.eoss.org/pubs/far_annotated.htm
>> -- Kyle Yankanich
>> On Mon, Oct 29, 2012 at 3:19 PM, Dave <dgsh...@gmail.com> wrote:
>>> How big a balloon do you think you'd need for what you have in mind? I
>>> think I have like an 8' diameter balloon.
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