Catamaran boat

Ships – Displacement-type hull – Multiple hulls

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Details

B63B 112

Patent

active

051880490

ABSTRACT:
A powered catamaran boat having displacement hulls (10) that provide stable boat performance. The two hulls (10) are joined by a deck structure (12), forming a tunnel (16) between the two hulls. Each of the hulls is symmetric and has a half entry angle (.theta.) less than 10.degree. at and below the water line, and a length-to-maximum beam ratio at the water line from approximately 9.88:1.0 to 10.92:1.0. The rear portion of each keel extends rearwardly and upwardly from the horizonal at an angle between approximately .80.degree. and 1.4.degree.. The ratio between the minimum vertical distance from the water line to the deck structure and the minimum width of the tunnel (16) is between 1.0:2.0 and 1.0:2.5. Additionally, each hull (10) includes a chine (50) that extends laterally outwardly from the hull a distance from approximately 3% to 6% of the maximum beam (24) of the hull at the water line.

REFERENCES:
patent: D230316 (1974-02-01), Hull
patent: D290948 (1987-07-01), Hledin
patent: 2950701 (1960-08-01), Stefani
patent: 3016861 (1962-01-01), Brown
patent: 3046926 (1962-07-01), Miller
patent: 4389958 (1983-06-01), March
patent: 4498409 (1985-02-01), Edel
patent: 4543898 (1985-10-01), Castilla
patent: 4565145 (1986-01-01), Mayall et al.
patent: 4813366 (1989-03-01), Elder
patent: 4951591 (1990-08-01), Coles
Cris-Craft Advertisement, Boating, Oct. 1984, p. 15, "Chris Cat".

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