# US 2009/0260561 A1 · Frictional Resistance Reduction Ship

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- Number: US 2009/0260561 A1
- Document ID: US20090260561A1
- Status: Published application
- Kind: A1
- Application number: 12/418,572
- Filed: 2009-04-04
- Published: 2009-10-22
- Earliest claimed: 2008-04-17
- Inventors: Yoshiaki Takahashi
- Web page: https://patentgrep.com/patent/US20090260561A1

## CPC

- B63B 1/38: using air bubbles or air layers {gas filled volumes (waterborne vessels travelling on air cushions B60V3/06)}
- Y02T 70/10: Measures concerning design or construction of watercraft hulls
- B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

[Problem Solved] The friction drag decreases and the friction resistance decrease ship that improves fuel cost is offered. [Means for Solving Problem] Duct 3 is divided into two or more independent chambers 5, with partition 4 according to the longitudinal direction; piping 6 is introduced in each chamber 5 and penetrates through partition 4to supply air to each chamber 5. Air is supplied by assistance compressor 7 through piping 6. Opening 8 is formed in the lateral aspect of each chamber 5, and microbubble generator 10 is installed in this opening 8.

## Claims

### Claim 1

A frictional resistance reduction ship,
along the lateral aspects of a hull of said ship, ducts for air supply are prepared almost perpendicularly from near the upper end of a hull to a bottom end,
each duct is divided by chambers which became independent along longitudinal directions.
piping for supplying air for every said chamber is introduced.
an opening is formed in said chambers.
a microbubble generator is attached to said openings.
said microbubble generator consists of a plate inserted in such opening and a wing for negative pressure generation attached to the plate, at the point which counters with wings of said plates, a window is formed which connected with the outside.

### Claim 2 (depends on 1)

A frictional resistance reduction ship according to claim 1, wherein a groove is formed at an upper stream part of the plate, in direction of movement of a ship, and the groove connects the window and the duct.

### Claim 3 (depends on 1)

An operating method of the frictional resistance reduction ship according to claim 1, wherein air-liquid interface in said air duct is depressed to a microbubble generator by the assist compressors, and discharge an air as microbubbles along a hull, using negative pressure generated by said wing with cruising of the ship and cruising the ship maintaining this state.

### Claim 4 (depends on 2)

An operating method of the frictional resistance reduction ship according to claim 2, wherein air-liquid interface in said air duct is depressed to a microbubble generator by the assist compressors, and discharge an air as microbubbles along a hull, using negative pressure generated by said wing with cruising of the ship and cruising the ship maintaining this state.