Abstract: A sailing craft having a hull with a longitudinal midplane. A primary boom is pivotally mounted on the hull for 360.degree. continuous rotation in either direction about a central vertical axis. The primary boom is connected by lines to a sail boom. At least one angled mast is mounted to the hull and extends upwardly. The mast has a top, the top is disposed approximately above the central vertical axis of the primary boom. A sail is carried by the sail boom and extends upwardly and substantially symmetrically about the central vertical axis. The sail is supported from the top of the at least one mast. The sail boom with the sail thereon has completely free 360.degree. rotation in either direction avoiding contact with the mast. The sail has flake lines swivelably connected to the top of the mast permitting rotation of the sail and flaking of the sail. A tension device maintains tension on the top of the halyard so the sail luff becomes tight when the primary boom rotates either end forward.

Abstract: A sailing craft having a center hull, a port hull and a starboard hull. The port and starboard hulls are adjustably connected to the center hull by bridge beams such that the port starboard hulls may be disposed adjacent to, or outward from, the center hull. An inverted U-shaped mast has legs angled outwardly and connected to the port and starboard hulls when the mast is erect and legs which are substantially parallel when the mast is stepped down for storage on the center hull. A primary boom is rotatably connected to the center hull and rotates through 360.degree.. An articulating boom is pivotally connected to each of the ends of the primary boom. A sail shape boom is connected to the articulating booms by a trolley on each articulating boom. The head of a sail is connected to the top of the mast and the foot of the sail is connected to the sail shape boom. The sail and booms are rotatable through 360.degree. without contacting the mast.

Abstract: A plan for a sail of a sailing craft such as a sailboat, an iceboat and a land yacht having a hull. At least one mast is mounted on an end of the hull and the mast angles upwardly over the hull. A boom is pivotably mounted approximately amidships of the hull. The boom is rotatable through 360.degree. about the mounting point, and the ends of the boom avoid contact with the at least one mast. A triangular sail has a lower edge connected to the boom and an upper corner releasably connected to the top of the at least one mast. The boom, preferably, has an upper member and a lower member. The upper member is rotatable, and the sail may be roller reefed about the upper member. A steering system for the vehicle is provided which is collocated with the controls for the sail whereby the vehicle may be controlled by one individual at a single location.