A frame may comprise a plurality of interlocking tab-and-slot frame members forming a three-dimensional structure. A removable stringer may be designed into one or more of the interlocking tab-and-slot frame members. The stringers may be removed after positioning and welding of tab-and slot frame members together. Notches may also be designed into and formed as additional features of a tab-and-slot frame member. Notches may serve as a guide for bending tab-and-slot frame members and in the creation of tabs and/or slots of the tab-and-slot frame members.

A frame may comprise a plurality of interlocking tab-and-slot frame members forming a three-dimensional structure. A removable stringer may be designed into one or more of the interlocking tab-and-slot frame members. The stringers may be removed after positioning and welding of tab-and slot frame members together. Notches may also be designed into and formed as additional features of a tab-and-slot frame member. Notches may serve as a guide for bending tab-and-slot frame members and in the creation of tabs and/or slots of the tab-and-slot frame members.

A system for mounting equipment to a vessel's hull is disclosed. The system comprises a first stringer and a second stringer, where each stringer is attachable to the inside of the vessel's hull. The system also includes a layer of adhesive attaching both stringers to the inside of the vessels hull. Both stringers have a top cap for attaching equipment. Additionally, each stringer has a first vertical side wall connected to a first end of the top cap, a second vertical side wall connected to a second end of the top cap, and two flanged portions. A first flanged portion connects to a lower end of the first vertical side wall, and a second flanged portion connects to a lower end of the second vertical side wall. The system has an open side portion at the bottom end of both stringers.

The invention preferably relates to a method for stiffening a sheet element. In this regard, the method preferably comprises a first step of providing stiffening modules comprising a flange and at least one web. Furthermore, the stiffening modules are preferably attached to the sheet element sequentially along a load path, wherein the stiffening modules are connected to each other via their respective flanges using connecting means and/or joining methods for a positive, frictional and/or materially bonded connection to form a stiffening structure, such that the stiffening modules have a combined effect, specifically stiffening and reinforcing the sheet element. The invention also preferably relates to a stiffening structure for a sheet element comprising a plurality of stiffening modules arranged sequentially, and to a stiffening system comprising a stiffening structure and a sheet element.

A system for mounting equipment to a vessel's hull is disclosed. The system comprises a first stringer and a second stringer, where each stringer is attachable to the inside of the vessel's hull. The system also includes a layer of adhesive attaching both stringers to the inside of the vessels hull. Both stringers have a top cap for attaching equipment. Additionally, each stringer has a first vertical side wall connected to a first end of the top cap, a second vertical side wall connected to a second end of the top cap, and two flanged portions. A first flanged portion connects to a lower end of the first vertical side wall, and a second flanged portion connects to a lower end of the second vertical side wall. The system has an open side portion at the bottom end of both stringers.

The present disclosure describes recreational watercraft that provide a ballast system and an open platform passenger deck. An example is an aluminum hull including a ballast system to regulate displacement by the recreational watercraft and an open platform passenger deck as an integral upper surface to the aluminum hull. Multiple sides, continuous from the aluminum hull, include a stern side, a bow side, a port side, and a starboard side that surround a perimeter of the open platform passenger deck. An inboard power plant is located within a stern portion of the aluminum hull to propel the recreational watercraft.

The present disclosure describes recreational watercraft that provide a ballast system and an open platform passenger deck. An example is an aluminum hull including a ballast system to regulate displacement by the recreational watercraft and an open platform passenger deck as an integral upper surface to the aluminum hull. Multiple sides, continuous from the aluminum hull, include a stern side, a bow side, a port side, and a starboard side that surround a perimeter of the open platform passenger deck. An inboard power plant is located within a stern portion of the aluminum hull to propel the recreational watercraft.

Recreational watercraft and methods of operating recreational watercraft are described. Recreational watercraft can include an aluminum hull, a plurality of ballast tanks, a first surface defining a first opening that extends from an interior of a ballast tank of the plurality of ballast tanks to an exterior of the hull, a valve configured to selectively open or close the first opening, and a second surface defining a second opening that is fixed permanently open and extends from an interior of the ballast tank through a bottom portion of the hull to an exterior of the hull.

Recreational watercraft and methods of operating recreational watercraft are described. Recreational watercraft can include an aluminum hull, a plurality of ballast tanks, a first surface defining a first opening that extends from an interior of a ballast tank of the plurality of ballast tanks to an exterior of the hull, a valve configured to selectively open or close the first opening, and a second surface defining a second opening that is fixed permanently open and extends from an interior of the ballast tank through a bottom portion of the hull to an exterior of the hull.

The invention relates, among other things, to a component including at least one base plate, at least one cover plate arranged on the base plate, at least one damping layer arranged between the base plate and the cover plate and at least one stiffening element. The base plate is free from the cover plate and the damping layer at least in sections on the cover plate side in a connection area, and the stiffening element is connected to the base plate and the cover plate on the cover plate side in the connection area. The invention further relates to a method for the manufacture of a component and a use of a component.