Foil arrangement for a boat and a method for installing the same

A hydrofoil arrangement for a boat comprising a hull, the hydrofoil arrangement comprising:

• a fastening device arranged to be fastened on an outside of the hull in a position below a waterline of the hull when the hull does not move through the water;
• a pivot point arranged at a stern of the hull;
• a first rigid element, the first rigid element being elongated and having a first end and a second end, the first rigid element further being arranged to be pivotally connected at the first end to the pivot point so that the first rigid element can pivot in a first pivot plane to a first pivot position where the first rigid element is fastened to the hull by means of the fastening device as well as to a second pivot position where the first rigid element is not fastened to the hull by means of the fastening device, the first pivot plane being substantially vertical and substantially parallel to a forward direction of the boat;
• a second rigid element, the second rigid element being elongated and comprising a first end and a second end, the first end of the second rigid element being connected to the second end of the first rigid element, the second rigid element being arranged to extend at an angle to the first rigid element when the first rigid element is fastened to the fastening device so that the second end of the second rigid element is at a vertical distance from the hull;
• and
• a main hydrofoil, fastened to the second end of the second rigid element,
• wherein the first rigid element can be pivoted from the first position so that its second end moves downwards and backwards, and thereafter upwards and further backwards, to a third position where its second end is arranged stern of the hull.