A kite control system including an aerodynamic wing with a leading edge and first and second opposing wingtips, a control device, a first steering line secured to the first wingtip and the control device, a second steering line secured to the second wingtip and the control device, and a trim line secured...http://www.google.com.au/patents/US7621485?utm_source=gb-gplus-sharePatent US7621485 - Trim line kite control system
