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- Why use helium instead of hydrogen?
- Wouldn't you get more lift? Leakage maybe?
- Are there flight requirements other than avoiding restricted airspace?
- Do you have to notify anyone or announce the release on the radio?
I uploaded the group photograph at https://commons.wikimedia.org/wiki/File:2016_SpaceBlimp_VI_on_27_September_2016.jpg#.7B.7Bint:license-header.7D.7D on Wikimedia Commons. Geraldshields11