winding device and uncoiler (1) including a system of winding and unwinding a sail, for winding and unwinding on a sailboat asymmetric sail winding (9), said device comprising at least a tubular outer foil (4A, 4B) and one foil cable or mainsheet inner stay (3), forming said outer and foils within a set of foil that is adapted to transmit torque winding for winding said sail winding (9), which is wound on a foil coating (7) mounted on said outer foil (4A, 4B), said inner being flexible foils (3), outer (4A, 4B) and sheath (7); characterized in that said outer foil (4A, 4B) comprises a plurality of tubular segments (4A, 4B) connected and spaced apart by flexible spacer elements (42A, 42B) allowing said system coiling and uncoiling is easily folded and stored in a space put in reserve.
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