NOVELTY - A sail has a 3-dimensional (3D) flexible sail part (3). A semi-rigid supporting perimeter part (1) encircles the flexible part. A pocket or sleeve is provided for the perimeter part to form a closed loop around the perimeter of the fabric part. The perimeter part folds and coils into three contiguous circles to stow the sail compactly in approximately 20 percent of its uncoiled and unfolded geometrical size.    USE - Self-assembling, self-launching sail for propelling a land-based or water-borne craft (all claimed) using the force generated from the wind. Uses include but are not limited to a small sea-craft, watercraft, kayak, paddleboard or canoe.    ADVANTAGE - The self-assembling, self-launching sail can be immediately deployed, utilized and then doused by a single user while craft is out on the water. It can be utilized without the need for any masts, booms, boom-sticks, battens, lines or securing devices. It is easily, simply and quickly de-powered in wind gusts. It can be collapsed and stowed with an 80 percent reduction in size. The sail advances the current applications of small craft sailing practices by being easier and quicker to set-up and launch. This relates to less time the paddler is required to tie, assemble, rig or otherwise deal with a sail as doing so removes their hands from the capsize-arresting paddle needed for safety. It offers advances such as greater craft stability owing to the fact that the sail provides essentially the same sailing force but with a lower center of gravity due to its light weight is less prone to upset and capsizing small watercraft such as kayaks and canoes. It is lighter in weight than any similar sized small craft sailing item which relates to less mass required to load and carry in a small kayak or other watercraft. It employs new high elastic and fracture resistant materials, as well as making use of a unique folding and coiling physical property of a circular and perimeter structure. It is lighter (less massive), simpler (less complex and complicated), and quicker in deploying and stowing. It also allows for a greater margin of personal safety. It offers technological advances in the field of small craft sailing in terms of weight, simplicity, reductions in size and personal safety.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for propelling a craft.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of the sail with the entire sail area surrounded by the perimeter part but without various attachment devices.    Perimeter part (1)    Overlap joint area (2)    3D sail part (3)    Perimeter sleeve material (4)