A buoyant structure contains a hull. The hull has a main deck, a lower inwardly-tapering frustoconical side section that extends from the main deck, a lower generally rounded section extending from the lower inwardly-tapering frustoconical side section, a generally rounded keel, a fin-shaped appendage secured to a lower and an outer portion of an exterior of the keel, and an offloading device slidably connected to an outside surface of the hull configured for rotating around an outer circumference of the hull.

A buoyant structure has a hull having a main deck, a lower inwardly-tapering frustoconical side section that extends from the main deck, a lower generally round section extending from the lower inwardly-tapering frustroconical side section, a keel having an n-polytope shape, a plurality of separate tunnels between columns extending from the keel having an n-polytope shape and a fin-shaped appendage is secured to a lower and an outer portion of the hull. The at least one tunnel contains water at operational depth of the buoyant structure.

A buoyant structure contains a hull having a main deck, a lower inwardly-tapering frustoconical side section that extends from the main deck, a lower ellipsoidal section extending from the lower inwardly-tapering frustroconical side section, a keel having an n-polytope shape, a fin-shaped appendage secured to a lower and an outer portion of the exterior of the keel having the n-polytope shape, and a plurality of columns connected between the keel having the n-polytope shape and the main deck forming one or more tunnels between the plurality of columns.

A buoyant structure having a hull, a main deck, an upper cylindrical side section extending downwardly from the main deck, an upper frustoconical side section, a cylindrical neck, a lower ellipsoidal section that extends from the cylindrical neck, an ellipsoidal keel and a fin-shaped appendage secured to a lower and an outer portion of the exterior of the ellipsoid keel. The upper frustoconical side section located below the upper cylindrical side section and maintained to be above a water line for a transport depth and partially below the water line for an operational depth of the buoyant structure.

A vessel with three platformsan outer hull, an inner deck hull and a passenger carriage, having four independent suspension systems there between so as to accommodate for the multi axis movements of the outer hull. This multi axis suspension system spread between the three platforms will offer the passenger carriage stability against the pitch, yaw and roll rotations a vessel makes as it twists and turns going up and down the slope of a wave as well as the heave, sway and surge movements induced by the waves pushing the vessel around and or the ship sliding down the face of a wave.

A vessel with three platformsan outer hull, an inner deck hull and a passenger carriage, having four independent suspension systems there between so as to accommodate for the multi axis movements of the outer hull. This multi axis suspension system spread between the three platforms will offer the passenger carriage stability against the pitch, yaw and roll rotations a vessel makes as it twists and turns going up and down the slope of a wave as well as the heave, sway and surge movements induced by the waves pushing the vessel around and or the ship sliding down the face of a wave.

A vessel with three platformsan outer hull, an inner deck hull and a passenger carriage, having four independent suspension systems there between so as to accommodate for the multi axis movements of the outer hull. This multi axis suspension system spread between the three platforms will offer the passenger carriage stability against the pitch, yaw and roll rotations a vessel makes as it twists and turns going up and down the slope of a wave as well as the heave, sway and surge movements induced by the waves pushing the vessel around and or the ship sliding down the face of a wave.

The present disclosure relates to an unmanned floating production unit (300) and method of installing a floating production unit comprising a deck structure (301) for mounting equipment for processing hydrocarbons, and a hull structure (302) formed from a first section (303) and a second section (306), wherein the second section (306) is wider than the first section (303). The floating production unit (300) according to the present disclosure can provide a compact unit, which has dimensions which can lead to a heave natural period outside an area of significant wave energy, and as a result, it has substantially reduced and improved hydrodynamic responses. The floating production unit is configured to be small and lightweight, and can be fabricated, launched and towed to the installation site in two parts, without the requirement for heavy lifting or construction machinery, thus lowering manufacturing costs. In addition, the two parts of the floating production unit can be joined together at the installation site using a buoyancy and ballasting based technique. The floating production unit is designed to be unmanned during routine production operations, thus ensuring operating costs are low.

Methods and systems are provided for nautical stationkeeping of free-floating objects. In one example, a method includes adjusting translational motion of a body freely floating in water by rotating the body. The translational motion may be adjusted, for instance, to maintain the body within a geographic area. In certain examples, the adjustment of the translational motion may be realized via a Magnus effect induced by rotating the body. The body may be configured as, for example, a free-floating object such as a wave engine.

A method for offshore floating petroleum production, storage and offloading comprising receiving hydrocarbons from at least one of an FPSO, production risers, or wellhead on the seabed by a floating hull; processing received hydrocarbons forming hydrocarbon product in the floating hull; storing the hydrocarbon product in the floating hull; and offloading the stored hydrocarbon product. The floating hull contains a hull plan view that is circular and wherein the floating hull has a bottom surface, a top deck surface, at least three connected sections, joined in series and symmetrically configured about a vertical axis with the connected sections extending downwardly from the top deck surface toward the bottom surface. The at least three connected sections contain an upper cylindrical portion, a lower conical section, a cylindrical neck section, and a set of fins secured to the hull configured to provide hydrodynamic performance through linear and quadratic damping.