Modern Rigids
There are no rigid airships flying today. The Zeppelin company refers to their NT ship as a rigid but this is a misnomer. The envelope shape is retained in part by super-pressure of the lifting gas, and so the NT is more correctly classified as a semi-rigid.
Read more about this topic: Rigid Airship
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“The medieval university looked backwards; it professed to be a storehouse of old knowledge.... The modern university looks forward, and is a factory of new knowledge.”
—Thomas Henry Huxley (1825–1895)