http://sites.google.com/site/wingskatesailpict/
http://home.swipnet.se/ansar/s.html
see also,
http://blog.modernmechanix.com/skim-over-the-ice-with-a-skaters-sail/#more
http://www.youtube.com/watch?v=4yVWg7-KFe0
http://www.youtube.com/watch?v=2emgfAowqDo
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