Keywords: 3194514rogallobiplane.jpg Patent clip shows Francis M Rogallo also envisioned hung-payload gliders using stiffened Rogallo wings in a BIPLANE format U S Patent 3194514 detail only a small part of the large patent 2008-02-14 Joefaust 00 49 15 February 2008 UTC Public domain all rights released PD-USGov Kite diagrams Rogallo wings |