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Flying around the world in the jet stream for ninety cents of hydrogen gas..
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DaveBev:
The radio has already flown around the world once and now is flying near Italy. The electronics are challenging but fun. The radio is carried by two party balloons filled with about 90 cents of hydrogen gas. The radio is quite light and transmits a WSPR signal which is received by Ham radio people and decoded. Electronics must work down to -40c.  If you want to know more about this hobby, it is explained here http://qrp-labs.com/flights/u4b2.html
Dave VE3KCL
janoc:
That's a pretty impressive feat, congrats!

BTW, you may want to fix the link - the final dot should be removed.
I also suggest switching to e.g. OSM for the maps because Google doesn't like people publishing stuff with their development keys - once the map starts to get a lot of hits, you will have problems.
DaveBev:
Thanks Janoc 
The balloon is forecast to fly around Corsica and then head east over Russia
SparkFly:
Very cool, I am always impressed with these superpressure flights. Can you share any more information on the balloon envelopes? I've been toying with the idea of doing my own flights, but haven't committed yet. Did you do any prestretching of the balloons? I've heard Leo Bodnar experimented with custom envelopes, but I can't seem to find any sheets of the right material/dimensions. Would love to find a supplier of that....

Hats off to you. :clap:
DaveBev:
Sparkfly on the balloons they are clear party balloons available on aliexpress. I stretch them with .6psi of dry air. If you explore the website and look for previous flights all the details are there on how to build and fly them along with tons of mistakes made on the way.
Dave
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