A movable platform assembly for a boat includes a support structure configured to be connected to the boat, a platform, and a horizontal translation system connecting the platform to the support structure, the horizontal translation system having a pair of main arms rotatable about respective vertical rotation axes, and a pair of main sliders sliding in a transverse direction along a main guide integral with the platform. Each main arm has a proximal end hinged to the support structure and a distal end hinged to a respective main slider. The platform is translatable between a retracted position and an extended position with respect to the support structure.

A lower deck for a watercraft is attached to and supported by an amidships hull, and an actuator slides the lower deck and amidships hull between a stowed position and an extended position on guide rails that are secured to the underside frame of the upper deck that is supported by abeam hulls. When fully extended, the lower deck remains attached to the watercraft while a portion of the lower deck's aft section and the aft end of the amidships hull remains beneath the upper deck. A pair of side beams respectively connect to a port side and a starboard side of the lower deck or the amidships hull. Sliding members, such as rollers and/or guide bars respectively connect to the guide rails, and the side beams respectively engage and slide on the sliding members.

A boat in which at least a portion of at least one of the port side and the starboard side of the hull is moveable between a first position and a second position. In the first position the moveable portion forms a generally upright portion of the port or starboard side of the hull, and, in the second position, the moveable portion forms a generally horizontal deck surface. A walkway connects a seating area within the boat to an area aft of the seating area, and at least a portion of the walkway is adjacent to the moveable portion of the port or starboard side. A first seat is positioned adjacent to at least a portion of the walkway and a removable seat is configured to be positioned over the walkway and adjacent to the first seat.

The present invention comprises a device for acting on water flow as a watercraft moves through the water. The device is generally comprised of a primary plate having two downward angled tabs and a handle. Device is installed on the stern of watercraft, preferably engaged to a prior art ladder. The angular tabs and primary plate delay a portion of the wake from reaching the surface of the water, thereby allowing time for the converging water flow from either side of the watercraft to merge more seamlessly with the wake. This convergence creates a more laminar surf wave.

Sun heats dark continents more than reflective oceans. Air moves onshore from high pressure to low. Creating wind: powering weather and storms—“hurricane-in-a-box-on-water” principles producing electricity in a marine vessel, providing Green Technology for Marine Transportation. Captured and recovered heat, offset by loss of heat, creates differential pressure conditions across multiple rotary engines. Night and day, a working fluid moves from high pressure to low; powering alternators, batteries, domestics, and in-hull electric drive trains, in a unique, lightweight exoskeleton dome shell design vessel. Disclosed vessel design advantages include: high energy collection and living space to vessel length ratio; high strength to weight ratio; high carrying capacity, downwind sailing while producing electricity; modular fabrication and shipping; and sustained hull speed in a vessel harvesting energy from the environment. The longer the vessel: the more it carries: the greater the hull speed: the faster it goes.

A retractable entry/exit system for a boat that mounts below a swim platform or other similar boat structure. The system has a main frame, a linkage, a number of step assemblies and a single actuator. The actuator is configured to move the linkage to selectively extend or retract the step assemblies. When retracted, the system is folded into a compact arrangement under the mounting structure. When extended, the step assemblies extend beyond the mounting structure, where they can be used to conveniently enter and exit the boat or as a place to rest, lounge, sit or otherwise enjoy the water. The linkage may include a bell crank assembly with integral linkage arms, as well as a pair of supplemental linkage arms. The linkage arms may be disposed toward opposite sides of the system and may be operatively coupled to step brackets that support opposite ends of each step assembly.

An attachable watercraft chair. The attachable watercraft chair includes a chair formed by a back member and a seat member that are pivotally connected. The back member has a first end placed distally to the seat member and a second end placed proximally to the seat member. A first pair of brackets are connected to the back member. The first pair of brackets have suction cups mounted on them. Also, a second pair of brackets are connected to the back member. The second pair of brackets have a support bar that spans across the back member. The attachable watercraft chair can be attached and removed from a watercraft.

A catamaran type vessel that includes two rigid side hulls connected by a connector to form a rigid form containing a usable space. The vessel contains a lowered and lifted platform together with the platform drive unit. The platform is a separate portion of the aft part of the deck, in the form of a flat frame with a usable overlay fixed on the surface of the frame. An edge of the platform in the upper position cooperates with an edge of the aft part of the deck, with the platform frame being attached to the horizontal edges of two supports. The rear vertical edge of each support is connected by axes of rotation with a pair of rigid arms in the pantograph system connected with two horizontal axes of rotation attached on the other side of the rigid arms to the vessel hull connector wall.

Boats can include a swim platform with an integrated system of steps that can be selectively deployed and retracted. Such platforms can be attached to a transom of a boat or can be fabricated as an extended portion of the boat's hull. In another embodiment, deployable steps can be integrated with a boat's hull as a side-entry door. In order to reconfigure the step system into a deployed configuration, a linkage is actuated that causes the step system to unfold, forming steps (or a seating configuration) at least partially below the water line. Since the steps can be deployed below the water line, a swimmer can more easily get on board the boat.

A cockpit extension that extends aft of a boat transom for increasing the afterdeck area of the boat. The cockpit extension includes a deck that can be accessed from the afterdeck of the boat and an under-face beneath the deck that can be above or below the water-line of the boat. The cockpit extension can also include one or more of a gunwale, inner bulkhead, and outer freeboard. A running surface can also be provided on the under-face that improves the backing down process of the boat. The boat has at least two outboard engines, attached on the port and starboard sides of the boat transom, respectively.