[FridayoLeary]

Since the Hindenburg disaster, hydrogen zeppelins have gone out of style. Probably rightly so. What non-flammable levitating gas we are left with is helium. Never mind that helium appears to be going up in price, it has twice the density of hydrogen and hence, is far less efficient. So i think zeppelins are basically dead, except for short, recreational flights.

[loudmax]

I could see a use for hydrogen filled drone zeppelins carrying cargo. Cargo typically doesn't need to travel as quickly as people do and we can take risks with cargo that we wouldn't take with people.

Also, I have a feeling that hydrogen got a disproportionally bad reputation after Hindenburg. After all, people do travel in devices that are loaded with gasoline and jet fuel, so it's not like it isn't possible to safely handle flammable material.

[FridayoLeary]

I don't know about you but i just have a nightmarish vision in my head of thousands of self - propelled incendiary devices flying around and setting cities and countrysides ablaze. Shudder. No thanks.

And your comparison of zeppelins to cars and planes is flawed. The former consists chiefly of an extremely flammable gas. Protecting it is a thin layer of canvas (which can also burn). The latter contain a relatively small container of liquid which is protected by layers of solid metal and foam and all kinds of valves.