Planing boat with foldable fairing

A planing boat having at least one hull with its vertical longitudinal center plane and at least one transom with its lower peripheral edge comprising trailing edges of bottom planing surface of said hull and side edges defining intersection of sides of boat hull with said transom, located at side extremities of said bottom trailing edges and extending substantially upward at least to the waterline of said boat in its displacement position,

• which boat is provided with at least one movable relative the hull fairing located aft of said transom and having a peripheral leading edge, which peripheral leading edge of the fairing in its lower operational position, corresponding low-speed displacement and transitional modes of the boat, is predominantly shaped to conform to, abuts upon and fits flush with the lower peripheral edge of the transom at least up to the waterline of said boat in its displacement position,
• whereas, when the boat is in its main operational high-speed planing mode or at rest, the fairing is in its upper inactive position, in which the peripheral leading edge of the fairing, like the fairing as a whole, is located higher than the trailing edges of the bottom planing surface of the hull in projection onto the transverse plane,
• wherein said fairing consists of at least two parts successively arranged along the length of the boat, while at least one after part is moveable relative to the adjacent forward part, so that by moving said after part forward, the fairing can be folded to reduce its longitudinal dimension in said upper inactive position of the fairing.