4 ms·
Helium is comparatively expensive, but you don't expend it as part of normal flight and it doesn't migrate very quickly through modern materials. A bigger prob
by gozur88 10y ago
Helium is comparatively expensive, but you don't expend it as part of normal flight and it doesn't migrate very quickly through modern materials. A bigger problem than loss is fouling - you have to pump out the helium and purify it every so often (I think Zeppelin does it every six months).
- aaron695 10y agoHydrogen is close to free. ~$2 per 10kgs of lift if my internet calculations are correct. But I guess if helium isn't lost at a great rate, it might be a cheap part of the whole setup.