name correction
Sorry,the fella in Lubbock is Bruce Ruefer,a local designer and hang-gliding enthusiast.I might guess that he's using rip-stop nylon for the envelope.
There have been inflatable light planes since the 1950s.Looking over some of Goodyear Aerospace's patents would show you how they handle sewn-in bulkheads,formers and stringers to help 'fix' the inflated shape.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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