A twin hull foldout watercraft that quickly and easily deploys from a small mobile and portable size unit that will fit into a vehicle or stow in a closet, camper or larger boat to a dry stable watercraft that could be used with small motor, paddles, ores, stand up paddles, push poles or sail and which has all parts and accessories attached thereto. The twin hull foldout watercraft comprises a central deck, two side mounted hull flaps hingedly attached to the opposing side edges of the central deck and positionable in a vertical or horizontal position, a fore deck extension member hingedly attached to the front edge of the central deck and positionable in a vertical or horizontal position, and an aft deck extension member hingedly attached to the rear edge and which can be extended out from the rear of the central deck.

An extendable and retractable lower deck is supported by one or more longitudinally extending hulls. The lower deck slides between an extended position and a stowed position on rails that are secured to the underside of an upper deck of a houseboat, pontoon boat, tritoon boat, catamaran, floating dock, pier-supported dock or other watercraft or dock. When fully extended, the floating deck remains attached to the watercraft, and additional width may be achieved with laterally expandable panels in the lower deck. Various accessories are connected to the lower deck or to a storage hold in the hull beneath the lower deck, such as a pool liner insert, a hot tub liner insert, a slide and ladder assembly, a seat and mounting bracket assembly, a volleyball net and pole assembly, an umbrella and pole assembly, a hammock and stand assembly, a seat lift, and an expandable deck insert.

An apparatus (206), including: a support (206) having: a strut (204) with a sleeve (214) disposed at a lower end (212); and a base (200) configured to be secured to the strut via a pivot joint (210) therebetween. The base has a fin (202) configured to fit within and cooperate with the sleeve to enable the strut to pivot about an axis of rotation (220) of the pivot joint while maintaining a cant angle (222) that is less than 90 relative to the axis of rotation. The fin includes a first fin section (230) that extends circumferentially about the axis of rotation and a second fin section (232) that extends circumferentially about the axis of rotation. The second fin section is disposed axially offset from the first fin section and radially outward from the first fin section relative to the axis of rotation.

A portable and inflatable boat with self-secure and storage arrangement includes a hard shell body and an inflatable floating platform. The hard shell body includes a container unit, made of rigid material, having a concave engaging surface extended between an upper surface and a lower surface to define a concave engagement groove. The inflatable floating platform includes an inflatable floating body which has a circular outer side and a U-shape inner side which defines a U-shape mounting slot forming a convex engagement ridge along the U-shape mounting slot. After inflation, the U-shape mounting slot is configured to fittingly receive the hard shell body therein and the convex engagement ridge presses against the concave engaging surface so as to engage the hard shell body with the inflated inflatable floating body securely.

A kayak having a main body and at least one telescoping extendable insert. The extendable insert can expand out of and collapse into the main body of the kayak, allowing for the kayak to be more compact for storage and transport. The telescoping extendable inserts of the kayak latch into place when the kayak is fully extended. An automatic spring-loaded catch mechanism helps secure the telescoping extendable inserts in place before they are latched together by the user.