A support for inclusion internally within a plastic boat body to structurally reinforce the plastic boat body is provided. The support may comprise a support plate and a support brace. Also provided is a reinforced component for a plastic boat body, comprising an interior support; and one or more plastic exterior walls. Plastic boats comprising supports and reinforced components are also provided. Further provided are associated kits, systems, and methods.

A method of making a tubular casing for an underwater device, wherein a metal ring made of aluminum is subjected to an anodizing process that produces an insulating layer of aluminum oxide that covers it externally. The ring is coupled with a mould that defines a cylindrical surface on which the following are deposited: first layers of carbon fibre to produce a first cylindrically-shaped tubular element in carbon fibre provided with an end portion that engages a first groove of the ring; a layer of syntactic material configured to transfer radial forces; and second layers of carbon fibre to produce a second cylindrically-shaped tubular element in carbon fibre that covers the syntactic layer and is provided with an end portion that engages a first groove of the ring.

A floating carrier device is configured to support at least one solar element floating on a water body, in particular an inland water body, with at least one floating body and with a carrier structure which is coupled with the floating body and is configured to transfer a support force of the at least one solar element to the at least one floating body.