The present invention relates to the hydrofoil system ofsailing-trimarans which provides the following arrangement of the hydrofoils.Inclined, retractable foil is placed in a head of each outrigger, onwardsfrom the center of area of the sails and from the centre of gravity ofa trimaran. Two additional hydrofoils are arranged one by one on thestern of each outrigger so as to let them be clear of the water, if theside wind pressure effecting on the sails is low. The third additionalhydrofoil is arranged on the rudder in the stem of the central hull.
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