Fast ship

Patent metadata

Field	Value
Publication number	US-9359048-B2
Application number	US-201414761175-A
Country	US
Kind code	B2
Filing date	Jan 17, 2014
Priority date	Jan 18, 2013
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A ship whereby the hull and the mechanical propulsion device are designed such that the Froude number is larger than 0.5. In the aft ship the hull has a bottom with V-shaped bottom surfaces with a deadrise angle that is less than 40 degrees and the hull has substantially vertical sides. In the hull are a passenger compartment and a trim tank. The trim tank volume is such that the weight of a filled trim tank is more than 30% of the weight of displacement of the hull with an empty trim tank, filling the trim tank with water increases the amidships immersed width with at least 10%, and the bottom surfaces have bilge keels fully immersed when the trim tank is filled with water and the bilge keels are at least in part above the water level when the trim tank is empty.

First claim

The invention claimed is:

1. A ship comprising a hull with a waterline length and a mechanical propulsion device for generating a maximum speed, whereby the hull and the propulsion device are designed such that the Froude number (v/√{g*L}) is larger than 0.5, the hull has a foreship with a bow and an aft ship with a stern, in the aft ship the hull has a bottom with V-shaped bottom surfaces that in the immersed part of the hull extend symmetrically upwards with a deadrise angle that is less than 40 degrees and above the water level the hull has substantially vertical sides, in the hull are a passenger compartment and a trim tank with a trim tank volume characterized in that the trim tank volume is such that the weight of a filled trim tank is more than 30% of the weight of displacement of the hull with an empty trim tank, that the hull is designed such that filling the trim tank with water increases the amidships immersed width or beam of the hull when stationary in the water with at least 10%, and that in the aft ship the bottom surfaces have bilge keels located such that the bilge keels are fully immersed when the trim tank is filled with water and the bilge keels are at least in part above the water level when the trim tank is empty.

2. The ship in accordance with claim 1 wherein the bilge keels are retractable.

3. The ship in accordance with claim 1 wherein when the trim tank is filled with water the bilge keels extend to a draught of more than 0.50 m or more than 4% of the immersed width or beam, whichever is less.

4. The ship in accordance with claim 1 , wherein the bilge keels extend perpendicular to the bottom surfaces with a bilge keel height of more than 0.50 m or more than 4% of the width or beam at water level, whichever is less.

5. The ship in accordance with claim 1 wherein in the downwards directed angle between the bilge keel and the bottom surface there is a rounded transition with a radius that is at least 50% of the bilge keel height and wherein the bilge keels are located such that with an empty trim tank and with a forward moving ship the bottom surfaces and the bilge keels create a downwards directed spray.

6. The ship in accordance with claim 1 wherein the bilge keels extend on each side of the hull over a length of more than 30% of the overall length.

7. The ship in accordance with claim 1 wherein the bilge keels extend on each side of the hull over a length of approximately 60% of the overall length.

8. The ship in accordance with claim 6 , wherein the bilge keels extend from the aft ship towards the foreship.

9. The ship in accordance with claim 1 wherein the trim tank comprises one or more compartments that is located amidships above the center of gravity of the hull or amidships at the sides of the ship.

10. The ship in accordance with claim 1 wherein the trim tank comprises two compartments and one trim tank compartment is located in the foreship near the bow and one trim tank compartment is located near the stern.

11. The ship in accordance with claim 1 wherein the trim tank is located at approximately the water level.

12. The ship in accordance with claim 1 wherein the passenger compartment is near the center of gravity of the hull and the passenger compartment is acoustically isolated.

13. The ship in accordance with claim 12 wherein the passenger compartment comprises passenger seats that have backrests that are reclinable to a substantially horizontal position.

14. The ship in accordance with claim 12 wherein the passenger compartment includes a visual display.

15. The ship in accordance with claim 1 wherein the trim tank is located above main deck level.

16. The ship according to claim 12 wherein said passenger compartment has an air conditioning system.

Assignees

• Univ Delft Tech

Inventors

• Keuning Jan Alexander

Classifications

• B63B2001/066

  Substantially vertical stems · CPC title

• B63B2039/067

  effecting motion dampening by means of fixed or movable resistance bodies, e.g. by bilge keels · CPC title

• B63B2003/385

  with means for controlling heeling or rolling motions, or lift, e.g. flaps, by changing geometry, or by ballast displacement · CPC title

• B63B43/06 Primary

  using ballast tanks (conduits for emptying or ballasting B63B13/00) · CPC title

• B63B2043/047

  by means of hull shapes comprising a wide hull portion near the design water line, and a slender, buoyancy providing, main hull portion extending towards the bottom · CPC title