Hull with righting moment producing fins

Details Hull with righting moment producing fins Hull with righting moment producing fins

1975-08-08

1976-11-09

Blix, Trygve M.

Ships

Ballasting

Fins and boards

114 39, 114149, B63B 3906

Patent

active

039903842

ABSTRACT:
A boat hull including a center depending keel fin is provided and the keel fin includes an upstanding rear edge portion having a horizontally rearwardly opening transverse recess formed therein. An upstanding main fin extending generally longitudinally of the hull is oscillatably supported in the forward portion of the keel fin recess for angular displacement about an upstanding axis spaced forward of the horizontal longitudinal center of the main fin and an upstanding front-to-rear extending servo fin is oscillatably supported from the rear portion of the main fin for angular displacement relative thereto about an upstanding axis. The interior of the hull includes heel sensing drive structure operatively connected between the hull and the servo fin for displacing the latter to starboard relative to the main fin in response to starboard heeling of the hull and displacing the servo fin to port relative to the main fin in response to heeling of the hull to port. The servo fin is relatively small in effective area as compared to the area of the main fin and its displacement to port and starboard serves to oppositely displace the freely swingable main fin to starboard and port, respectively. Displacement of the main fin to port during starboard heeling of the hull during forward movement of the hull through water serves to exert a righting moment on the hull and displacement of the main fin to starboard during port heeling of the hull serves to exert a righting moment on the hull.

REFERENCES:
patent: 1574567 (1926-02-01), Flettner
patent: 2804038 (1957-08-01), Barkla
patent: 2858788 (1958-11-01), Lyman
patent: 3008442 (1961-11-01), Russell

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