The hang glider is actually a triangle-shaped airfoil, a modified parachute (known as a flexible wing) made of nylon or Dacron fabric. The triangular shape is maintained by rigid aluminium or composite tubes and cables and is designed to allow air to flow over the surface to make the wing rise.
Also i found the video on paper hang gilder (triangle-shaped) without airfoil.I feel that we can use the idea on triangle-shaped wing.
http://www.youtube.com/watch?annotation_id=annotation_3837&v=GIVp1FZl1MM&feature=iv
Da Vinci Glider
http://www.youtube.com/watch?v=XC74ImdHaLQ&feature=related
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