Marine propulsion – Screw propeller – Having means to control flow around propeller
Patent
1977-10-17
1982-12-14
Basinger, Sherman D.
Marine propulsion
Screw propeller
Having means to control flow around propeller
114 57, 440 79, B63H 516
Patent
active
043636306
ABSTRACT:
A clear annular space is provided around the propeller shaft shroud between the aft end of the helical channel proper and the propeller disc. The helical channel is brought far enough around the shaft shroud root so that the aft end of the web formed where the helical channel becomes tangent to the outer hull skin is at an angle not exceeding 40.degree. above the horizontal and preferably not more than 35.degree.. The overall cross-sectional taper of the afterbody takes into account the shaft shrouds as well as the rest of the hull. Because it has been found that the effectiveness of helical channels in smoothing out the torque loads on propeller blades is difficult to predict and sometimes is negative, the method of establishing the configuration by model tests is important. In that method, the radial component of water flow with respect to the propeller disc may be neglected, but both the axial and the peripheral component must be considered in establishing a favorable hull configuration.
REFERENCES:
patent: 1801875 (1931-04-01), Melcher
patent: 2349286 (1944-05-01), Kreitner et al.
patent: 2729182 (1956-01-01), Tommasi
patent: 3455263 (1969-07-01), Nonnecke
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