Patent · US Expired

Fin tab device for marine vessels

US4831954A · kind A · utility

4Cited by

10References

9Claims

0Family size

Assignee

KAWASAKI JUKOGYO KABUSHIKI KAISHA · JP

Inventors

Sosuke Kinouchi · Kakogawa, JP
Hideto Yoshitake · Akashi, JP

Key dates

Filing date	Nov 6, 1987
Grant date	May 23, 1989
Priority date	—
Expiry date	Nov 6, 2007

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB63H5/16
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A fin tab device for a marine vessel driven by a propeller is provided with a fin-shaped main fin tab member and a fin-shaped sub-fin tab member, both tab members extending downwardly from a substantially planar fixing portion detachably and adjustably secured to the bottom face of a stern structure. The two tab members are in an in-line, spaced-apart, tandem relation, the sub-fin tab member projecting downwardly a shorter distance than the main fin tab member. The sub-fin tab member is at a positon between the tip circle of the propeller and the main fin tab member. Cavitation bubbles first collide with the sub-fin tab member, imparting impact force thereto, whereby the lower end portion thereof is broken while the main fin tab member is shielded and protected by the sub-fin tab member.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.