A sailboat, preferably with constrained sail, comprising a hull (22) extending along a main extension direction (X) with a lower surface (23), designated to be partly or fully submerged in water, and an upper surface (24), suitable to accommodate a helmsman (51) in a lying down position and having the head on the backrest (53, 27), a sail (55) fixed on a mast (54) along which axis (Z) extends, characterised in that said mast (54) is engaged in a support (56) directly fixed to the hull (22) and in that said hull (22) has - along the edges thereof, which extend along the axis (X), an ansa lunata (25) and an ansa lunata (26), respectively, each of which extend along the axis (Y).
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