US3570438A - Profiled stabilizing fin for a ship - Google Patents

Profiled stabilizing fin for a ship Download PDF

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Publication number
US3570438A
US3570438A US767351A US3570438DA US3570438A US 3570438 A US3570438 A US 3570438A US 767351 A US767351 A US 767351A US 3570438D A US3570438D A US 3570438DA US 3570438 A US3570438 A US 3570438A
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United States
Prior art keywords
fin
section
stabilizing
ship
concave
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Expired - Lifetime
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US767351A
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English (en)
Inventor
Damian Mackowiak
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Individual
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Individual
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Priority claimed from PL123218A external-priority patent/PL58713B1/pl
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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 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B63B2039/067—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water effecting motion dampening by means of fixed or movable resistance bodies, e.g. by bilge keels

Definitions

  • Lavine ABSTRACT A ship with stabilizing fins either laterally extending or forming the bilge keel, which fins are fixed and which have thin leading edges, an upper surface that is concave, and a lower surface that diverges from the upper surface.
  • These fixed stabilizing fins lie in their asymmetrical or symmetrical profile disposed on the bilges along the central part of the hull of the ship, both working planes (lower and upper) of which possess a certain convergence in the direction of the ships bow.
  • the planes noted may be straight line of they can have a concave curvature.
  • each of the lower and upper working plane of the stabilizing fin whose individual rear edge heights either decrease as they near the bow of the ship along the line of the hull, or are of the same height or they may also be provided under a system of individual elementary working planes interconnected to form one integral unit, or spaced along the central part of the ships hull at a certain distance, thus producing the so-called intermittent system.
  • HG. ll shows a plan view of the central part of a ships hull with fixed stabilizing fins (stretched out beyond the ships hull outlines) of varying basic dimensions;
  • FIG. 2 is a cross section taken on line A-A of FIG. 1 showing a first embodiment of the invention
  • FIG. 3 is a similar cross section of a second embodiment
  • FIG. 4 is a similar cross section of a third embodiment
  • FIG. 5 is a cross section of a fourth embodiment
  • FIG. 6 is an elevational view of the fin as shown in FIG. 5, with a limiting plate
  • F lg. 7 is a plan view of the stabilizing fin of FIG. 6;
  • FIG. h is a similar cross section of another embodiment.
  • the disclosed profiled fixed stabilizing fins for damping the pitching and rolling of the ship installed in the central part of a ships hull ll (FIG. l) on bilges on both sides of the ship as fins 2 of length 3, width 4 and thickness 5 are characterized chiefly in that the first constructional embodiment (FIG. 2) has a two part discontinuous upper surface '7 and a two part discontinuous lower surface 6 which together define a forward section which is upwardly concave and which is of increasing thickness from the thin leading edge if) to the upper surface discontinuity line 9 which latter thereby establishes the thick rear edge of the forward section.
  • the rear edge of the forward section is located above the level of the leading edge 10, and has integral therewith the forward edge of a rear section which is downwardly concave and which is defined by the said upper and lower surfaces which converge to a thin trailing edge 8 located at about the same level as the leading edge Ml.
  • the lower and the upper concave working surfaces of the stabilizing fin 2 are symmetrically profiled relatively to a central plane ll, these surfaces 6 and 7 being convergent in the direction of the ships bow and, whose rear edges 8 and 9 are equidistant from the plane 11 and are joined by a rearwardly convex trailing edge l2.
  • the lower and the upper working surfaces 6 and 7 of the stabilizing fin 2 each comprises plural surface parts.
  • the lower surface 6 has three such parts each being concave downwardly and terminating at a rear edge 8 displaced from the central plane 11, while the upper surface 7has three such parts each concave upwardly and terminating at a rear edge 9 displaced from the central plane 11.
  • These surfaces thereby define three fin sections each having a thin forward portion and a-thicker rearward portion.
  • the rearmost fin section has a rearwardly convex trailing edge 12 joining the rear edges 8 and 9 thereof, and each fin section has the rearward portion thereof of greater thickness than the rearward portion of the fin section of it.
  • the lower and the upper surfaces 6 and 7 of the stabilizing fin 2 have substantially the same configuration as in FIG. 4, except that the rearward portion of the several fin sections are of the same thickness.
  • the lower and the upper working surfaces of the stabilizing fin 2 is similar to that in embodiment 4 (FIG. 5), but the fin 2 has on its outboard end limiting plate 13 to provide a finite width of the fin 2.
  • each fin 2 has a lower downwardly concave surface extending rearwardly from thin leading edge 10 and with a rear edge 8 displaced from plane 11, and an upper upwardly concave surface 7 extending rearwardly from thin leading edge 10 to a rear edge 9 displaced from plane ill.
  • the edges 8 and 9 are equidistant from plane 11 and are joined by flat trailing surface 12 perpendicular to plane ii.
  • the leading edge ll) of one fin 2 is spaced rearwardly by a space M from the trailing surface 12 of the fin 2 in advance thereof.
  • Each of the fins 2 is of substantially the same size and shape. This construction provides an intermittent fin system.
  • the principle of operation of the fixed stabilizing fins made in the form of bilge keels as well as extensile fin stabilizers is the following: due to the shaft of the working surfaces of the stabilizing fin 2 there is an increase in the front resistance of the fin and the angle of attack of the liquid flowing over the stabilizing fin during rolling of the ship making headway under sea-voyage conditions, which fact exerts in accordance with the basic principles of hydrodynamics direct influence on the growing profile lift and hence also on greater stabilization of rolling and pitching conditions of the ship.
  • the said type of profiled fixed stabilizing fins is always operating with the full surface of the fin acting in both directions, i.e., during the listing motion as well as during the returning of the ship to its initial state of equilibrium.
  • the profiled fixed stabilizing fins of the present invention have been subjected to laboratory verification tests which proved in full efiectiveness thereof.
  • the constructional embodiment of the profile stabilizing fin is especially suitable in the form of bilge keels where smaller floating units are involved.
  • the exemplary embodiment of the stabilizing fin as shown in FIGS. 3, 5, 6 and 8, in the form of bilge keels is effective for medium large and large floating units.
  • profiled fin development as shown in FIGS. 3 and 4 in the form of fins extended beyond the contours of the ship's hull, in both single, and multiple-finned oscillation stabilizers have a very high damping efiiciency in the case of medium large and large floating units.
  • stabilizing fin means comprises plural upper and lower surface parts defining first and second sections, the first section being upwardly concave and the upper surface part thereof being concave, said first section having a thin leading edge and a thick rear edge located at a height thereabove, said second section extending from the thick rear edge of said first section to a thin trailing edge, said second section being downwardly concave.
  • stabilizing fin means comprises plural upper and lower surface parts each diverging rearwardly from a relatively thin forward portion and with each said upper surface part being concave.
  • each fin section is of greater thickness than the rearward portion of the fin section in advance thereof.
  • said stabilizing fin means comprises plural fin sections.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Farming Of Fish And Shellfish (AREA)
US767351A 1967-10-25 1968-10-14 Profiled stabilizing fin for a ship Expired - Lifetime US3570438A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL123218A PL58713B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1967-10-25

Publications (1)

Publication Number Publication Date
US3570438A true US3570438A (en) 1971-03-16

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ID=19949767

Family Applications (1)

Application Number Title Priority Date Filing Date
US767351A Expired - Lifetime US3570438A (en) 1967-10-25 1968-10-14 Profiled stabilizing fin for a ship

Country Status (8)

Country Link
US (1) US3570438A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4910478B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1804307C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1589896A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1208523A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NO (1) NO124981B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE358601B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SU (1) SU506283A3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592299A (en) * 1984-11-07 1986-06-03 Christiansen Joseph R Ship's-vessel's rudder with reduced drag effected factors
WO1987006907A1 (en) * 1986-05-14 1987-11-19 Christiansen Joseph R Ship's-vessel's rudder with reduced drag effected factors
US8567332B1 (en) 2011-06-27 2013-10-29 The United States Of America As Represented By The Secretary Of The Navy Advanced bilge keel design
WO2014065672A1 (en) * 2013-04-18 2014-05-01 Ronny Skauen Stabilizer fin and active stabilizer system for a watercraft

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5188095A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1975-01-29 1976-08-02
JPS52146985U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1976-04-30 1977-11-08
RU2500568C1 (ru) * 2012-11-27 2013-12-10 Василий Алексеевич Фирсов Успокоитель боковой качки судна
RU2600487C1 (ru) * 2015-05-29 2016-10-20 Акционерное общество "Зеленодольское проектно-конструкторское бюро" (АО "Зеленодольское ПКБ") Решетчатый скуловой киль для судов водоизмещающего и переходного режимов движения

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE683298C (de) * 1937-08-04 1939-11-03 Hanns Freiherr Schertel Von Bu Schiffskoerper mit Auftriebsflaechen
US2408788A (en) * 1939-06-16 1946-10-08 Ludington Charles Townsend Airfoil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE683298C (de) * 1937-08-04 1939-11-03 Hanns Freiherr Schertel Von Bu Schiffskoerper mit Auftriebsflaechen
US2408788A (en) * 1939-06-16 1946-10-08 Ludington Charles Townsend Airfoil

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592299A (en) * 1984-11-07 1986-06-03 Christiansen Joseph R Ship's-vessel's rudder with reduced drag effected factors
WO1987006907A1 (en) * 1986-05-14 1987-11-19 Christiansen Joseph R Ship's-vessel's rudder with reduced drag effected factors
US8567332B1 (en) 2011-06-27 2013-10-29 The United States Of America As Represented By The Secretary Of The Navy Advanced bilge keel design
WO2014065672A1 (en) * 2013-04-18 2014-05-01 Ronny Skauen Stabilizer fin and active stabilizer system for a watercraft
US9527556B2 (en) 2013-04-18 2016-12-27 Ronny Skauen Stabilizer fin and active stabilizer system for a watercraft
RU2617159C1 (ru) * 2013-04-18 2017-04-21 Ронни СКЁУЭН Бортовой управляемый руль и активная система стабилизации для судна

Also Published As

Publication number Publication date
SU506283A3 (ru) 1976-03-05
NO124981B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-07-03
SE358601B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-08-06
DE1804307B2 (de) 1973-02-08
GB1208523A (en) 1970-10-14
DE1804307C3 (de) 1973-09-20
FR1589896A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1970-04-06
JPS4910478B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-03-11
DE1804307A1 (de) 1969-05-14

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