A modular hydrofoil watercraft may include a plurality of modules which are releasably connectable to each other to when assembled form the modular hydrofoil watercraft. The modular hydrofoil watercraft when assembled may include a hull extending along a longitudinal center axis, a propulsion system that has a motor and a propelling member, a mast that extends downwardly from the hull and a hydrofoil connected to the mast.

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) hasalong 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).

A sail board foot repositioning system is provided. The sail board repositioning system has a plate assembly rotatably attached to the sail board top surface. The plate assembly provides foot attachment means and means for changing the orientation of the plate for a resulting desired foot orientation.

A sail board foot repositioning system is provided. The sail board repositioning system has a plate assembly rotatably attached to the sail board top surface. The plate assembly provides foot attachment means and means for changing the orientation of the plate for a resulting desired foot orientation.

The electric hydrofoil watercraft according to the invention has a thermally insulated mast, thermal insulation and vibration isolation are provided between the mast and the above-water platform by placing an insulating element between them. This increases the life of the hydrofoil and improves user experience.