US3566821A - Hull for propeller-driven vessels - Google Patents

Hull for propeller-driven vessels Download PDF

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Publication number
US3566821A
US3566821A US751483A US3566821DA US3566821A US 3566821 A US3566821 A US 3566821A US 751483 A US751483 A US 751483A US 3566821D A US3566821D A US 3566821DA US 3566821 A US3566821 A US 3566821A
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US
United States
Prior art keywords
hull
mount
stern
propeller
leading section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US751483A
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English (en)
Inventor
Herbert Schneekluth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blohm and Voss GmbH
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Blohm and Voss GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19671531561 external-priority patent/DE1531561A1/de
Application filed by Blohm and Voss GmbH filed Critical Blohm and Voss GmbH
Application granted granted Critical
Publication of US3566821A publication Critical patent/US3566821A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/08—Shape of aft part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

Definitions

  • a hull for propeller-driven vessels includes a front portion and a rear portion.
  • the rear portion includes a leading section and a trailing section. It further includes a hull plating having at opposite sides of the rear portion mutually inclined outer guide surface means constructed and arranged to effect in the region of the leading section a rearward and upward deflection of fluid streaming along the hull towards the rear portion.
  • An elongated rearwardly tapering bulge extends rearwardly from the region of the leading section of the rear portion.
  • the present invention generally relates to propeller-driven vessels, and more particularly to hulls for propeller-driven vessels.
  • a strake is one breadth of planks forming a continuous strip on the bottom or the sides of a vessel and reaching from the stem to the stern of the same.
  • stern bulges that is a bulge-shaped portion of the hull located at the stern which serves the purpose of regulating the flowstream pattern so as to reduce periodic changes in the flow delivery direction of the rotating propeller blades, and the resulting vibrations.
  • stern bulges in vessels having strake-lined hulls provide no advantages; in particular, they do not afford a significant reduction in drag resistance and a concomitant saving of drivepower requirements, even if some improvement in the flow is produced by the provision of such a stern bulge.
  • a concomitant object of the invention is to provide such a hull construction which, owing to its novel configuration, permits significant savings in drive-power requirements.
  • a hull for propeller-driven vessels which comprises a front portion, and a rear portion.
  • the front portion includes a leading section which is closer to and a trailing section which is farther spaced from the front portion.
  • the rear portion includes a hull plating having at opposite sides of the rear portion mutually.
  • inclined outer guide surface means which are constructed and arranged so as to effect in the region of the leading section of the rear portion a rearward and upward deflection of fluid which streams along the hull from the front portion thereof towards the rear portion.
  • I provide an elongated rearwardly tapering bulge which extends from the rear portion and which merges into the same in the region of the leading section thereof.
  • I prevent or counteract separation or breakup of the flow stream, as seen with respect to the width of the ships bull, in the region of the stern bulge, and this in turn results in a reduction of the hull drag resistance. This enables me to obtain a reduction in drive-power requirements for a vessel hull so constructed.
  • the bulge may have an asymmetrical cross-sectional configuration such that, if one divides the bulge by an imaginary vertical plane bisecting the bulge in longitudinal direction of the same, the bulge will have two differently dimensioned parts located at opposite sides of this plane. This a oids the disadvantages of asymmetrical operation of the propeller.
  • the bulge be bounded by an outer circumferential surface which is developable, or that it be assembled from components, such as plates, which have outer surfaces some of which are developable and some of which are planar. This makes for a particularly simple and inexpensive manufacture of the bulgemember.
  • I may also provide a cylindrical or conical intermediate member which is located intermediate the trailing end of the bulge and the propeller.
  • the propeller may be mounted directly on the trailing end of the bulge, by providing the intermediate member "I effect a more strong reduction in the drag than in the flow stream factor, and a concomitant improvement in the hydrodynamic factor of the hull. This applies, incidentally,even in ships wherein the form of the stem is different from the type here under discussion.
  • FIG. 1 is a diagrammatic side view illustrating a first embodiment of the invention.
  • FIG. 2 is a view similar to FIG. 1, but illustrating a second embodiment of the invention.
  • FIG. 1 there will be seen the stern or that portion 1 of a ship hull the remainder including the front portion of which is not shown because it is not of importance in connection with the present invention.
  • the front portion must of course be understood to be located toward the right of stern l in FIG. I.
  • the stern 1 has a flat outer skin structure, that is the hull plating la does not have strake lines and is rather provided with flat outer guide surfaces lb which are mutually inclined at opposite sides of the stem 1 and a bottom face having a substantially horizontal general plane and facing downwardly.
  • the trailing section of the stem 1 is identified by reference character A whereas the leading section is identified by reference character B.
  • the fluid boundary layer flowing rearwardly along the hull that is inthe direction towards the trailing section A from the right-hand side of the drawing, will be sharply deflected in rearward and upward direction at the forward section of the stern, that is at the upwardly inclined line constituting the forward section and identified with reference character B.
  • the stem 1 is provided with a stern bulge or propeller mount 2 which is elongated and tapers rearwardly from the forward section B in the direction towards the rearward section A.
  • the stem bulge 2 merges with the forward section B at the widest portion of the bulge 2, which latter in the illustrated embodiment is of cone shape, and thus has a developable outer circumferential surface, in the region of the section B, as indicated by the arrows 2.
  • the, base part or root indicated by the arrows 2 extends rearwardly from the forward section B at or in the region of which the fluid stream is deflected rearwardly and upwardly.
  • the propeller 3 with the propeller cap 6 is carried directly by the trailing end of the stern bulge 2.
  • a dead fin 4 of known construction is also provided extending from the upper side of the stern bulge 2 to the stem 1; this dead fin 4 improves the flow of liquid in the direction towards the propeller 3 and prevents or counteracts break up or separation of the flow between the bulge and the underside of the stern located above the bulge.
  • FIG. 2 is substantially the same as that of FIG. 1. Identical reference numerals have been used to identify identical components. Unlike the embodiment of FIG. 1, however, the embodiment of FIG. 2 shows an intermediate member 5 interposed between the propeller 3 and the trailing end 2 inches of the stern bulge 2.
  • This intermediate member 5 may be cylindrical or conical in cross-sectional configuration and can be used to advantage with certain stern shapes. As pointed out earlier, its use will further reduce the drag by an extent greater than the reduction in the flow stream factor, and the use of the intermediate member 5 is possible with advantage with hulls having various different stern forms.
  • the cross-sectional configuration of the stern bulge 2 need not be symmetrical. In fact, it may be asymmetrical, which is to say that if the stern bulge 2 is assumed to be bisected by a vertical plane in the direction of elongation of the stern bulge 2, the cross-sectional configuration of the two sections of the bulge located at opposite sides of this plane may be different. While such an arrangement is not shown in detail, being clearly evident to those having ordinary skill in the art, it is pointed out that it will serve to counteract the disadvantages resulting from asymmetrical operation of the propeller 3.
  • a hull for propeller-driven vessels comprising a bow portion, and a stern portion including a leading section closer to and a trailing section farther from said bow portion, said stern portion further including hull plating having at opposite sides of said stern portion mutually inclined outer guide surface means constructed and arranged so as to effect in the region of said leading section a rearward and upward deflection of fluid which streams along said hull from said bow portion towards said stern portion; an elongated rearwardly tapering propeller mount including a main mount portion extending from said stern portion and merging into the same in said region of said leading section, an aft mount portion and an intermediate mount portion of substantially cylindrical configuration extending rearwardly from said main mount portion between the same and said aft mount portion; and a propeller mounted on said intermediate mount portion.
  • a hull for propeller-driven vessels comprising a bow portion, anda stern portion including a leading section closer to and a trailing section farther from said bow portion, said stern portion further including hull plating having at opposite sides of said stern portion mutually inclined outer guide surface means constructed and arranged so as to effect in the region of said leading section a rearward and upward deflection of fluid which streams along said hull from said bow portion towards said stern portion; an elongated rearwardly tapering propeller mount including a main mount portion extending from said stern portion and merging into the same in said region of said leading section, an aft mount portion and an intermediate mount portion of substantially conical configuration extending rearwardly from said mount portion between the same and said aft mount portion; and a propeller mounted on said intermediate mount portion.
  • a hull as defined in claim 2, said mount having an upper side and a lower side; and further comprising a dead fin ex tending at least at one side of said mount in direction from said bow portion towards'said stern portion.
  • a hull as defined in claim 2 said amount being bounded by a developable outersurface.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Toys (AREA)
  • Bridges Or Land Bridges (AREA)
US751483A 1967-08-11 1968-08-09 Hull for propeller-driven vessels Expired - Lifetime US3566821A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671531561 DE1531561A1 (de) 1967-08-11 1967-08-11 Anordnung bei einem sich nach hinten verjuengenden Heckwulst

Publications (1)

Publication Number Publication Date
US3566821A true US3566821A (en) 1971-03-02

Family

ID=5675515

Family Applications (1)

Application Number Title Priority Date Filing Date
US751483A Expired - Lifetime US3566821A (en) 1967-08-11 1968-08-09 Hull for propeller-driven vessels

Country Status (8)

Country Link
US (1) US3566821A (enrdf_load_stackoverflow)
BE (1) BE718391A (enrdf_load_stackoverflow)
BR (1) BR6801367D0 (enrdf_load_stackoverflow)
ES (1) ES356416A1 (enrdf_load_stackoverflow)
FR (1) FR1573611A (enrdf_load_stackoverflow)
GB (1) GB1234619A (enrdf_load_stackoverflow)
IL (1) IL30397A (enrdf_load_stackoverflow)
NO (1) NO123785B (enrdf_load_stackoverflow)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US538353A (en) * 1895-04-30 Construction of vessels
GB200538A (en) * 1922-02-14 1923-07-16 Adolph Ferdinand Hamacek Improvements in ship hull contour
US2564560A (en) * 1948-09-04 1951-08-14 Ateliers Et Chantiers De Franc Hull stern
US3162168A (en) * 1962-06-22 1964-12-22 Theodore E Ferris & Sons Ship with increased cargo capacity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US538353A (en) * 1895-04-30 Construction of vessels
GB200538A (en) * 1922-02-14 1923-07-16 Adolph Ferdinand Hamacek Improvements in ship hull contour
US2564560A (en) * 1948-09-04 1951-08-14 Ateliers Et Chantiers De Franc Hull stern
US3162168A (en) * 1962-06-22 1964-12-22 Theodore E Ferris & Sons Ship with increased cargo capacity

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Vol. II, Pages 519 & 520, Hydrodynamics in Ship Design. Published by The Society of Naval Architects and Marine Engineers, New York, 6, N.Y. Vol. II, 1957. *

Also Published As

Publication number Publication date
IL30397A0 (en) 1968-09-26
NO123785B (enrdf_load_stackoverflow) 1972-01-17
BR6801367D0 (pt) 1973-01-11
GB1234619A (enrdf_load_stackoverflow) 1971-06-09
IL30397A (en) 1972-01-27
BE718391A (enrdf_load_stackoverflow) 1968-12-31
ES356416A1 (es) 1970-01-01
FR1573611A (enrdf_load_stackoverflow) 1969-07-04

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