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Forum » Technical Questions » GPS and Transmitter » EyeFi SD Card
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Mingle Forum by cartpauj
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Anyone ever tried sending up “chloroprene” weather balloons? I am considering testing one along with regular latex balloons.
Can anyone address how you are able to track the altitude during ascent? I wanted to use an iPod Touch instead of the phone because of the mobileMe application. However, mobileMe does not track altitude - so far as I have been able to tell. Any ideas? Thanks
My high students just completed a launch in the Phoenix-Tucson area (12/9). It went 120 miles total- 50 more miles than the Wyoming predictions. The retrieval was a challenge. Our camera angle didn’t allow for many atmospheric shots, but got some great ground shots and a few planes. I estimate that altitude to be between 80-100k.
Question- anyone know of cheap, but reliable altimeters? Or is there another way to gauge altitude? I tried doing angular measurements of ground features, but not sure how reliable they are.
http://www.youtube.com/watch?v=SnRz58K16Ag
Question- How did the Icarus guys figure their altitude? I haven’t found it on the site. I don’t think they had an altimeter did they?
I am trying to figure out how to do altitude without an altimeter.
OK. So I have a 600g balloon. How much helium does it hold? I’m going to buy the helium now and do the math laters, so I need a number that’s More than what I need.
I am gearing up to build and launch a upper atmosphere observer. This will include video gps tracking and gps logging to keep track of the pay load and record its flight path. I hope to launch in late july early august. I want to use a 500 gram balloon with a burst diameter of 15 feet. I want to reach an altitude of 100 to 150 thousand feet. 1) Can this be done with that balloon? 2) How far should I inflate the balloon? 3)Pay load is about 5 to 10 pounds +/-, parachute will be a 40 inch, What is the best way to deploy the chute?
I have an answer some of your questions: 1. You will only get to about 80-90000ft if you use the 500g balloon. 2. You should inflate it to about 9-10 ft, but I am not so sure about the exact diameter. 3. Max payload weight is slightly over 2.2 lbs. I got these specs from a similar 500g balloon with a burst diameter of around 17 ft. I would suggest getting a larger balloon for your task. You can look up “weather balloon” on ebay and there are a few large (2000+ gram) military surplus balloons up for sale for about $35 each. Getting enough helium in such large balloons would be expensive, but if that’ s not a problem for you, buying a surplus one would be the best bet.