HacDC Spaceblimp

From HacDC Wiki

Revision as of 14:31, 20 October 2010 by Gatohaus (talk | contribs) (refined question)
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?