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 to the leading edge substantially between the opposing wingtips, wherein the trim line has a user adjustable length device that allows the user to adjust and mechanically fix the length of the trim line while the aerodynamic wing is in flight.