Ships – Displacement-type hull – Screw propeller type
Patent
1982-03-30
1985-09-03
Blix, Trygve M.
Ships
Displacement-type hull
Screw propeller type
114162, 440 66, B63B 108
Patent
active
045385378
ABSTRACT:
An asymmetric aftbody for the hull of a ship having a twisted shape operative to achieve higher efficiency at practically all aftbody block coefficients by improving water flow and adapted to provide a shape wherein the tangential components of the wake are distributed as favorably as possible over the entire propeller circumference, the aftbody having an upper part above the propeller shaft which is combined with a part of the hull below the propeller shaft, the sectional areas of the hull having a bulbous or a U-shaped configuration with the center lines of the sectional areas being inclined away from the vertical longitudinal plane through the propeller center in opposite directions to that of propeller rotation such that when seen from aft the bulbous or U-shaped stern below the propeller shaft forms an angle of inclination with the vertical longitudinal plane in a direction opposite to that of propeller rotation.
REFERENCES:
patent: 3455263 (1969-07-01), Nonnecke
patent: 3635186 (1972-01-01), German
patent: 4309172 (1982-01-01), Narita et al.
patent: 4363630 (1982-12-01), Di Vigano
Avila Stephen P.
Blix Trygve M.
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