Trawl door with moveable hydrofoil sections

A spreading device for trawl fishing, seismic survey operations or other water activities where it is desirable to keep distance between two sides of a towed device, the spreading device having at least one part, which at least one part comprises two or more foils, where the foils in use are arranged such that a first foil is arranged foremost in the intended travelling direction of the spreading device, and a last foil is arranged rearmost with respect to the intended travelling direction, and where one or more foils having one or more moveable sections are arranged on one or both sides of a stationary foil, where each foil has a front surface and a rear surface, the surfaces each being defined by two edges and two side limitations, in use being front and rear edges (leading or trailing edges), an upper and lower side limitations where the upper and lower side limitations of the two or more foils are connected to respective upper and lower frames, where an axis is defined passing through the leading edge of the first foil and the trailing edge of the last foil, and where the first foil overlaps or at least overlaps a part of all other foils, and where a second foil overlaps the last foil, where the overlap of the first foil relative to the second foil is between 50% and 90% measured along the axis and where the overlap of the second foil relative to the last foil is between 30% and 90% measured along the axis where at least one foil is stationary and where one or more sections of foil is pivotably connected to the foil comprising one or more sections, such that the one or more sections may be moved from a position where the surface of any section is flush with the surface of the foil comprising sections, to a position where the surface is out of plane with the surface of the foil comprising sections.