Abstract: The sailing space frame of the present invention is supported by three hulls, a rudder hull a dagger board hull and an outrigger hull. The space frame also includes two mast assemblies, a fore spar, and a crew's quarters. The space frame can couple with a vessel propelled by a fossil fueled engine, and convert the combined space frame/vessel into an efficient sailing vessel that does not require fossil fuel for the trans-ocean portion of its voyage between ports. The outrigger provides sufficient stability to the sail propelled vessel so that it can carry a large enough sail area to supplant the use of the fossil fueled engine on the open ocean between ports. When entering or leaving a port the vessel uses its own engines for propulsion.

Abstract: The sailing space frame of the present invention is supported by three hulls, a rudder hull a dagger board hull and an outrigger hull. The space frame also includes two mast assemblies, a fore spar, and a crew's quarters. The space frame can couple with a vessel propelled by a fossil fueled engine, and convert the combined space frame/vessel into an efficient sailing vessel that does not require fossil fuel for the trans-ocean portion of its voyage between ports. The outrigger provides sufficient stability to the sail propelled vessel so that it can carry a large enough sail area to supplant the use of the fossil fueled engine on the open ocean between ports. When entering or leaving a port the vessel uses its own engines for propulsion.

Abstract: The sailboat of the present invention's space frame base is supported by three hulls. Each hull is allowed to rotate freely about a vertical axis intersecting one vertex of the triangular base and weathervane in the direction sailboat of the present invention motion. The direction that sailboat of the present invention moves is only constrained by an independent dagger board/canard rudder structure, whose orientation can be controlled relative to the space frame, when locked at an angle, relative to the nominal configuration. There are two masts on the sailboat each with a twin sail set. Each of said mast assemblies', orientation relative to the apparent wind, is controlled by associated canard winglets. These two masts and the fore spar complete the foldable space frame. The mast assembly angle relative to said base deck plane is changeable to enhance lift on one of said bow, starboard, or port hulls.

Abstract: A sailboat having a tetrahedral frame formed of six beams, three of which form the triangular deck with three hulls disposed at the vertices of the triangular deck extending outward from the plane of the deck. Two masts are formed by two of the three beams extending upward from the deck. The third beam completes the tetrahedral space frame structure and makes the assemblage rigid, and allows for easy folding of the sailboat space frame structure.