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That is an interesting idea, and I don’t know why this has been downvoted.

• TimTheTinker 7y ago
  Sounds kind of ludicrous to propose switching from helium to hydrogen in flight to save on the cost of helium. You’d still have to buy the helium (how else does it get off the ground?). Probably more if you intend to safely bring it back down.
  • 0db532a0 7y ago
    The idea I got was that for long-term flights, the helium would be used for launch, and lost helium would be replaced with hydrolysed hydrogen. Doesn’t sound too unrealistic.
    • TimTheTinker 7y ago
      That makes sense, thanks. I apologize for my acerbic ignorance in the above comment.