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A vacuum airship, also known as a vacuum balloon, is a hypothetical airship that is evacuated rather than filled with a lighter-than-air gas such as hydrogen or helium. First proposed by Italian monk Francesco Lana de Terzi in 1670,〔(【引用サイトリンク】 url=http://www.faculty.fairfield.edu/jmac/sj/scientists/lana.htm )〕 the vacuum balloon would be the ultimate expression of displacement lift power. ==History== From 1886 to 1900 Arthur De Bausset attempted in vain to raise funds to construct his "vacuum-tube" airship design, but despite early support in the United States Congress, the general public was skeptical. Illinois historian Howard Scamehorn reported that Octave Chanute and Albert Francis Zahm "publicly denounced and mathematically proved the fallacy of the vacuum principle", however the author does not give his source. De Bausset published a book on his design and offered $150,000 stock in the Transcontinental Aerial Navigation Company of Chicago. His patent application was eventually denied on the basis that it was "wholly theoretical, everything being based upon calculation and nothing upon trial or demonstration." In 1921, Lavanda Armstrong discloses a composite wall structure with a vacuum chamber "surrounded by a second envelop constructed so as to hold air under pressure, the walls of the envelope being spaced from one another and tied together", including a honeycomb-like cellular structure, however leaving some uncertainty how to achieve adequate buoyancy given "walls may be made as thick and strong as desired". In 1983, David Noel discussed the use of geodesic sphere covered with plastic film and "a double balloon containing pressurized air between the skins, and a vacuum in the centre". In 1982-1985 Emmanuel Bliamptis elaborated on energy sources and use of "inflatable strut rings". In 2004-2007 Akhmeteli and Gavrilin address choice of materials ("beryllium, boron carbide ceramic, and diamond-like carbon" or aluminum) in honeycomb double layer craft to address buckling issues.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vacuum airship」の詳細全文を読む スポンサード リンク
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