Replying to a comment on Zeppelins, and Why they Kick Ass
As a part of my senior design course at Cal Poly, back in the late 1980s, we designed a lighter than air system for highly cost efficient transportation around California; up the Central Valley, and around the LA basin, mostly.
Part of that study was a train, of course, and heavier than air planes that would drop passengers (and cargo) off onto a Zeppelin-ish craft (called an LTAC, as I recalled) in flight at speeds up to 200 mph. It burned alcohol (ethanol), had ten very conventional turboshaft engines, and stayed aloft on the rejected heat from those same engines. It was, essentially, a hot-air zeppelin with a 400 foot wingspan deltoid pumpkin seed.
The one I worked on could carry up to a thousand passengers and a thousand tons of cargo on a very broad, mall-like deck with multiple levels. No staterooms, but no one was expected to spend the night, either.
And that was back in the glory days of $20/bbl oil.
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