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Wat is lighter than Air ?
Nothing !
better say a Vacuum
in 1670 Francesco Lana de Terzi had that Idea for a Balloons with Vacuum inside 4 big copper sphere.
of course the Technology of 17 century was not ready for this.
and with 21 century Technology ?
or is this still a stupid Idea?
source
http://airshipworld.blogspot.com/2007_09_01_archive.html
picture
http://www.rusring.net/~levin/levin3d/dz.htm
Nothing !
better say a Vacuum
in 1670 Francesco Lana de Terzi had that Idea for a Balloons with Vacuum inside 4 big copper sphere.
![Francescp%20Lana%20-%20Airship.jpg](/proxy.php?image=http%3A%2F%2Flh5.google.com%2Fairshipworld%2FRuLZoWvFg1I%2FAAAAAAAAA2I%2FCYqPrqsolDA%2Fs288%2FFrancescp%2520Lana%2520-%2520Airship.jpg&hash=4cb19c8648dd7b7ba3571bd621762522)
of course the Technology of 17 century was not ready for this.
and with 21 century Technology ?
![hh19.jpg](/proxy.php?image=http%3A%2F%2Fwww.rusring.net%2F%7Elevin%2Flevin3d%2Fhh19.jpg&hash=976582582fb9be967ebf87b213d4acff)
or is this still a stupid Idea?
source
http://airshipworld.blogspot.com/2007_09_01_archive.html
picture
http://www.rusring.net/~levin/levin3d/dz.htm