A personal watercraft includes a hull having a bottom wall and a side wall extending upwardly from the bottom wall. The bottom and side walls define an interior volume of the hull. A battery pack includes a plurality of battery modules. The battery pack is positioned within the interior volume. A flotation body is positioned within the interior volume between the battery pack and at least one of the bottom wall of the hull and the side wall of the hull.

The present disclosure generally relates to a monocoque body for an unmanned underwater vehicle (“UUV”) comprising a nose portion, a tail portion, a body interior surface, a body exterior surface. The monocoque body can be a one-piece structural shell made of fiber reinforced polymer. The UUV may further include transverse structural members.

A method, system, and apparatus for collecting waste. In one embodiment, an autonomous plastic collecting robot (APCR) device for collecting waste may include a net structure that picks up micro plastic particles dispersed in water; a tube that transports the micro plastics collected by the net structure into a main internal container; an artificial tongue for collecting larger plastics, the artificial tongue comprised of a rolling staircase with fork-like structures in placed of the stairs; a plastic degrading medium contained in the main internal container; a no-joint tail structure which acts as the primary power source for the APCR, the no-joint tail structure housing dielectric elastomer materials and a rotation shaft located between at least two electric generators.

A method, system, and apparatus for collecting waste. In one embodiment, an autonomous plastic collecting robot (APCR) device for collecting waste may include a net structure that picks up micro plastic particles dispersed in water; a tube that transports the micro plastics collected by the net structure into a main internal container; an artificial tongue for collecting larger plastics, the artificial tongue comprised of a rolling staircase with fork-like structures in placed of the stairs; a plastic degrading medium contained in the main internal container; a no-joint tail structure which acts as the primary power source for the APCR, the no-joint tail structure housing dielectric elastomer materials and a rotation shaft located between at least two electric generators.

A marine vessel hull includes an outer hull layer and an inner liner connected to the outer hull layer forming a cavity therebetween. A wireless identification device is contained within the cavity between the outer hull layer and the inner liner. The wireless identification device stores and wirelessly transmits at least one of a vessel identifier, manufacture information, and ownership information for the marine vessel.

An elastic structure anti-impact frame body for use in ships, automobiles, aircraft, trains, railcars and other moving vehicles, said frame body being a wholly or partially elastic frame, the bearing components constituting the frame body forming an arc-shape or a wave-shaped curve, and the frame body being made of an elastic material. The whole or part of the structure of the elastic structure anti-impact frame body has an elastic deformation function; on the premise that the elastic structure does not affect normal driving or bearing capacity, under the force of an impact on said frame, the frame body will elastically deform within a corresponding safe range, and can cushion and absorb the energy of the impact; the frame body, when releasing the energy of the impact, returns to the original shape, greatly improving the anti-impact security factor.

An elastic structure anti-impact frame body for use in ships, automobiles, aircraft, trains, railcars and other moving vehicles, said frame body being a wholly or partially elastic frame, the bearing components constituting the frame body forming an arc-shape or a wave-shaped curve, and the frame body being made of an elastic material. The whole or part of the structure of the elastic structure anti-impact frame body has an elastic deformation function; on the premise that the elastic structure does not affect normal driving or bearing capacity, under the force of an impact on said frame, the frame body will elastically deform within a corresponding safe range, and can cushion and absorb the energy of the impact; the frame body, when releasing the energy of the impact, returns to the original shape, greatly improving the anti-impact security factor.

An apparatus including a fine-array porous material with a specific surface area higher than 10/mm, the specific surface area depending on different pore sizes, wherein the porous material comprises a plurality of pores having a substantially uniform size with a variation of less than about 20%, wherein the size is larger than about 100 nm and smaller than about 10 cm. The high-buoyancy apparatus can be part of a water vehicle such as a boat or a submarine, and the fine-array porous material is configured to reduce friction and/or control buoyancy. A conduit is also provided employing a fine-array porous material to reduce friction and/or control buoyancy. A garment is provided taking advantage of water repellant and/or UV/IR reflection properties of the fine-array porous material.

An apparatus including a fine-array porous material with a specific surface area higher than 10/mm, the specific surface area depending on different pore sizes, wherein the porous material comprises a plurality of pores having a substantially uniform size with a variation of less than about 20%, wherein the size is larger than about 100 nm and smaller than about 10 cm. The high-buoyancy apparatus can be part of a water vehicle such as a boat or a submarine, and the fine-array porous material is configured to reduce friction and/or control buoyancy. A conduit is also provided employing a fine-array porous material to reduce friction and/or control buoyancy. A garment is provided taking advantage of water repellant and/or UV/IR reflection properties of the fine-array porous material.

A collapsible boat hull (10) with at least one bottom panel (16,18) and two side panels (12,14), and a removable transom (32) with attachment means (36) to engage the transom with the two sides of the boat hull, such that, during installation of the transom member, the attachment means initially engages with the sides of the boat, and rotation of the transom to an upright position in the boat hull retains the attachment means and the respective sides of the boat hull together. Releasable latches (42,44) at the lower edge of the transom engage with retaining members (54) on the bottom panels. Seating or cross-bracing has (100) which releasably engage with retainers on the sides of the boat.