Abstract: A hull structure of nonmetallic material, in particular of a reinforced plastics material, for boats, ships, minesweepers and the like includes a preferably one-piece shell (1) and at least one deck (2, 2'). A plurality of ribs (3) are distributed along the length of the hull and extend across the corresponding transverse section of the shell (1). A plurality of transverse members (4, 4') (known as beams) extend directly underneath the deck (2, 2'). In order to give the hull greater structural strength and make it lighter, each transverse rib (3) joined to the shell (1) is connected (103, 203) to a corresponding transverse member (4, 4') joined to the deck (2, 2') and to continuous fore and aft members (15) (girders) passing in the manner of bulkheads, so as to form a single one-piece frame with the keel member.

Abstract: This invention relates to a ship having a monocoque or unitary-construction hull (1) made of a composite material having a base of suitably-reinforced plastics. According to the invention, the longitudinal strength of the hull (1) mainly derives from the monocoque or unitary-construction hull and the decks (4). Optional transverse reinforcing structures may be constituted exclusively by structural transverse bulkheads (5). The thickness of the monocoque hull (1) increases, preferably in a substantially uninterrupted manner, from the stringer area towards the keel (2). The keel (2) and the rolling chocks (3) are integral with, and made of the same material as, the monocoque hull (1). At least some tanks are constituted by cylinders (8, 8', 9) made of a plastics-based composite material and suspended, at a certain height from the bottom of the hull (1), between two successive structural transverse bulkheads (5).