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