Loading patent…
AssigneeStolt Offshore Limited
InventorsJohn L. Coates, Richard Anzbock, Stewart K. Willis, Gerhard Strasser
Estimating the term…
There is disclosed a hull for a sea-going vessel of displacement type having a flat bottomed midship section (100) of a constant cross-section which is substantially rectangular in cross section below the water line, and a converging bow portion (200) extending from said midship section, said bow portion having a curved transition (H) between the bottom (F) thereof and each hull side, the transition (C) between bottom and sides along the bilges in said midship section being relatively sharp, and in particular of radius less than 0.5 m, for example 0.025 m. The stern section (300) shape includes two propulsion arches each formed by an inclined, substantially part-cylindrical surface (S) extending from the flat bottom aft and upward to join the transom. The hull form provides a working vessel with extremely efficient roll-damping, yet sufficient transit speed for worldwide operation. The hull form can be constructed at relatively low cost, avoiding for the most part the need to form compound curves.
A hull for a sea-going vessel of displacement type having a flat bottomed midship section of a constant cross-section which is substantially rectangular barge form below the water line cross-section, and a converging bow portion extending from said mid-ship section, said bow portion having a curved transition between the bottom thereof and each hull side, the transition between bottom and sides along the bilges in said midship section being relatively sharp, and in particular of radius less than 0.5 m.
A hull as claimed in any preceding claim, in which the stern shape includes at least one propulsion arch formed by an inclined, substantially part-cylindrical surface extending from the flat bottom aft and upward to join the transom.
A hull according to any preceding claim wherein the midship section of rectangular cross sections extends for more than half the water line length of the vessel hull.
A hull as claimed in any preceding claim, wherein the leading end of the bow portion at the water line is of bulbous or nose form, with a concave curve transition into the adjacent rearwards part of the bow portion.
A sea-going vessel having a flat bottomed midship section and a stern section provided with at least one propulsion arch formed such that water flowing to occupy the propulsion arch comes predominantly from beneath the bottom, rather than from the sides of the vessel as the vessel moves through the water.
A sea-going vessel, the hull of the vessel below the water line comprising less than five percent compound curves in surface area.
A sea-going vessel, the hull of the vessel below the water line comprising a parallel midship section and bow and stern sections, the bow section comprising less than thirty, optionally less than twenty or ten percent compound curves in surface area.
A sea-going vessel, the hull of the vessel below the water line comprising a parallel midship section and bow and stern sections, the stern section comprising less than thirty percent, optionally less than twenty or ten percent compound curves in surface area.
A hull or vessel as claimed in any preceding claim;
A hull for a sea-going vessel, with, at least below the water line a substantially rectangular midship section, in which the stern shape includes at least one propulsion arch formed by an inclined, substantially part-cylindrical surface extending from the flat bottom aft and upward to join the transom.
Dependencies are inferred from the claim text.