Comment Comment by bfirsh The article fails to mention these are called "superpressure" balloons in case you're interested in reading more about them: https://en.m.wikipedia.org/wiki/Superpressure_balloonThere are some fantastic amateur projects doing similar things, such as this 11 gram payload (!) that circumnavigated the earth 6 times: http://leobodnar.com/balloons/B-64/index.html parent bfirsh 8 years ago
There are some fantastic amateur projects doing similar things, such as this 11 gram payload (!) that circumnavigated the earth 6 times: http://leobodnar.com/balloons/B-64/index.html