B - Operations – Transporting – 63 – B
Patent
B - Operations, Transporting
63
B
114/19
B63B 1/04 (2006.01) B63B 1/08 (2006.01)
Patent
CA 1237607
ABSTRACT This invention relates to the propulsion of self-propelled ves- sels, and in particular to the form of a ship's stern. The invention des- cribes a new and distinctive form of bulbous-shaped stern form which, unlike other stern bulbs developed to date, does not fair into the hull, instead in- tersecting it to create a sharp discontinuity between surfaces. This discon- tinuity creates a turbulent zone along the said intersection, allowing the wake to reorganize and to follow in a desired pattern the bulb's shape in the proximity of the propeller. Thus a more uniform wake field is formed within the propeller disc, consequently improving propeller efficiency and reducing propeller induced vibration. These effects, which result in improved quiet- ness and overall efficiency of a running propeller, along with other improved characteristics, have been confirmed by a preliminary series of model tests. The form of the bulb, and its attendant benefits, are described on the follow- ing pages.
500473
Allan Robert G.
Van Diepen Peter J.
Allan Robert G.
Van Diepen Peter J.
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