First few flights of my J-57 Slope Glider. It's made from 1 sheet of dollar store foam board, covered in packing tape. Site is Thornhill Broome near Malibu, California, USA.
More info here: http://jeffs.tiddlyspot.com/#J-57
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Aircalcs3 - J-57 (1 Sheet KFm SAL/Slope Wing) Made from a single sheet of Readiboard 5.4 oz KFm2...