You will find herewith the design of a rig which permits to use kite sails for propulsion of boats of all sizes. The sails are easily launched, even by a novice, easy to drive and are able to run against the wind. French patent granted (May 14th, 2004 - 01 04293) US patent granted (July 19th, 2005 - 6918346) European patent granted (July 26th, 2006 - 1373065 B1).