Comments by "Kevin Street" (@Kevin_Street) on "Airships: The Comeback We've Been Waiting For?" video.

  1. Thank you for a fair and load-balanced examination of modern airship technology. I really like the way you explained the load-exchange problem. That, and the ever present issues that come from different choices of lifting gas, seem to be the biggest obstacles for airship development. This is probably just sci-fi thinking, but I've always wondered if it would be possible to use hot air as a lifting gas, essentially combining the airship with a hot air balloon. Another more out there idea is to use vacuum instead of a lifting gas. That is, have a giant void with no air. That would be cheaper to maintain (just pump air out of the void instead of paying for gas that has to be pumped in) and free of potential safety problems. But it comes up against the limitations of modern materials technology. Vacuum airships would need to be made from something very strong and very cheap.
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