About: http://webisa.webdatacommons.org/231661895

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Its not really based on the wind pushing on the lower inside surface as such except if the wing is backstalled.They put tell-tails on the upper surface of sails to help keep the flow laminar.
http://www.w3.org/ns/prov#wasQuotedFrom	kiteforum.com