Abstract: Hull for a high speed boat, comprising a V-shaped hull bottom and channels extending in the longitudinal direction of the hull, arranged below the waterline of the hull and adapted for ballasting with water, comprising two channels (1, 2) being arranged near the hull bottom, as structural parts of the hull below the waterline of the hull, symmetrically to the centre axis of the boat, the front portions of the channels (1, 2) being connected with air apertures (4) arranged above the waterline, the channels (1, 2) comprising substantially open outlets (3) below the waterline in the stern of the boat, such that the channels are completely or partly filled with water when the boat is stationary or moved slowly, however, filled with air when the hull planes.