WO2016042527A1 - Coque pour bateaux pour vitesses élevées dans des conditions de mer irrégulières - Google Patents

Coque pour bateaux pour vitesses élevées dans des conditions de mer irrégulières Download PDF

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Publication number
WO2016042527A1
WO2016042527A1 PCT/IB2015/057202 IB2015057202W WO2016042527A1 WO 2016042527 A1 WO2016042527 A1 WO 2016042527A1 IB 2015057202 W IB2015057202 W IB 2015057202W WO 2016042527 A1 WO2016042527 A1 WO 2016042527A1
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WO
WIPO (PCT)
Prior art keywords
bow
center
hull
waterplane
abscissa
Prior art date
Application number
PCT/IB2015/057202
Other languages
English (en)
Inventor
Massimo DUO'
Original Assignee
Cantiere Navale Vittoria S.P.A.
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
Application filed by Cantiere Navale Vittoria S.P.A. filed Critical Cantiere Navale Vittoria S.P.A.
Publication of WO2016042527A1 publication Critical patent/WO2016042527A1/fr

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Classifications

    • 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
    • B63B1/06—Shape of fore part

Definitions

  • the present invention relates to a hull for boats for high speeds in irregular sea conditions.
  • the bow In traditional hulls, the bow usually has a stem with a profile on the longitudinal central plane which is curved or inclined rectilinear and radiused with a keel line substantially parallel to the waterplane.
  • the ax bow usually has a profile, on the longitudinal sectional plane of the hull, with a stem that is substantially perpendicular to the waterplane and radiused with a keel line that lies in the bow region along a curved line away from the waterplane.
  • the stem extends particularly upwardly, in so doing defining an 'ax' shape.
  • the ax bow was designed and developed mainly to reduce as far as possible the accelerations of slamming, and it certainly achieves the aim of containing as far as possible the impact of the bow on the waves, but it neglects other important aspects that cannot be disregarded in a boat, such as interior habitabil ity, increased resistance to motion in calm water, course stability, the possibility of using the prow deck exposed to the elements, and platform stabi lity.
  • the ax bow has very narrow transverse cross-sections, which are due to the sharpened contour of the ax bow, and therefore of limited capacity, while a traditional bow has more rounded transverse cross-sections, therefore with more space available for cargo and crew.
  • ax bows are very high, with consequent limitations on bow mooring operations, since the bow is always much higher than the rest of the boat and is extremely far from the quay.
  • ax bows are more indicated for high speeds while traditional bows have greater benefits for displacement speeds; by way of example, a vessel of approximately 65 m with a maximum speed of 20 knots (displacement speed) has a lower resistance with a traditional bow than with an ax bow.
  • the ax bow has a bow fin in order to limit the accelerations of the pitching motions with a moderate sea ahead, but this limits the ability to hold a course when the waves are coming from the aft quarter.
  • a further disadvantage caused by the consequences of the transverse forces described above is the increase in the rolling motion generated by the combination of pitching and yaw motions; in fact it should be noted that increasing the breadth of yaw motion combined with pitching motion generates more pronounced rolling movements which, in the event of resonance, can lead to the phenomenon of broaching i.e. of a transversely- inclined boat that cannot return to the upright position even with the aid of fins.
  • ax bows With regard to water shipped on deck, ax bows have very thin transverse cross-section forms and sides with profiles that are substantially free from flaring and are practically vertical at the point where they "cut” the water.
  • the ax bow has thin transverse cross-sections that certainly reduce, with a moderate sea ahead, the vertical accelerations; however it should be noted that this entails a considerable increase in the breadth of the pitching motions, with the consequent reduction of the maneuverability of the boat, thus obviating an essential requirement, particularly in work units and in military units, which is "platform stability", i.e. the capacity of the boat to maintain the main deck as parallel as possible to the surface of the sea.
  • platform stability i.e. the capacity of the boat to maintain the main deck as parallel as possible to the surface of the sea.
  • a boat with an ax bow favors the reduction of the vertical accelerations of slamming to the detriment of transverse accelerations, the latter being more significant for operations on board, to the detriment of other important aspects as described above.
  • a boat with an ax bow lends itself well to sailing in waters characterized by waves that are high, long and mostly regular, such as for example the northern European seas, by reducing the phenomena of slamming, in other ways, described above, the same boat with an ax bow is not the ideal solution for sailing in waters with wave formations that are very irregular in direction, height and length, such as for example in the basin of the Mediterranean Sea, where a boat with a traditional bow is capable of better performance.
  • the aim of the present invention is to provide a hull for boats for high speeds in irregular sea conditions which is capable of overcoming the above mentioned drawbacks of hulls with ax bows or traditional bows of the known type.
  • an object of the invention is to provide a hull with a bow that is more spacious and which at the same time is capable of limiting the accelerations of slamming.
  • Another object of the invention is to provide a hull that enables stable sailing with contained pitching motions.
  • Another object of the invention is to provide a hull that does not result in the drifting of the boat from the preset course.
  • Another object of the invention is to provide a hull that ensures that the decks can be used and the boat can be maneuvered at least under normal sailing conditions.
  • Another object of the invention is to provide a hull that makes it possible for the boat not to endure the phenomenon of broaching.
  • a hull for boats for high speeds in irregular sea conditions characterized in that it comprises a bow with a stem which has a profile, on the longitudinal central plane, that is curved or inclined rectilinear and radiused with a keel line which lies in the bow region along a line that diverges from the waterplane in the direction extending from the center of the boat toward the bow, so as to define a bow fin in order to limit the accelerations of pitching motions.
  • FIG. 1 is a perspective ⁇ view of a boat provided with a hull according to the invention
  • FIG. 2 is a side view of a portion of the hull according to the invention.
  • FIG. 3 is a view of the bow portion of a longitudinal body plan of a hull according to the invention.
  • FIG. 4 is the transverse body plan of a hull according to the invention.
  • FIG. 5 is a view of the bow portion of a horizontal body plan of a hull according to the invention.
  • FIG. 6 is a simplified horizontal body plan of a hull according to the invention.
  • a hull for boats for high speeds in irregular sea conditions is generally designated with the reference numeral 10.
  • the hull 10 is characterized in that it comprises a bow 1 1 with a stem 12 which has a profile, on the longitudinal central plane, clearly visible in Figures 2 and 3, that is inclined rectilinear and radiused with a keel line 13 which extends in the bow region along a line that diverges from the waterplane 14 in the direction extending from the center of the vessel toward the bow.
  • the stem 12 and the keel line are connected so as to define a bow fin 1 5 in order to limit the accelerations of the pitching motions.
  • the bow 1 1 has transverse cross-sections, for example 16, 1 7 and 18, which are slightly flared in their lower part.
  • the waterlines, for example 19, 20 and 21 , of the bow 1 1 on the horizontal body plan, as in Figure 5, at the bow fin 15, are thin and have a predominantly longitudinal extension.
  • the keel line 13 at the bow fin 15 is curved, with a concavity turned downwardly in the configuration for use of the hull 10.
  • the bow fin 1 5 reduces the effect of 'slamming' motions and, thanks to the 'streamlined' sections on the horizontal body plan, it helps in cutting through the waves, while, thanks to the slightly flared transverse cross- sections, it helps to limit splashes and the shipping of water onto the upper decks.
  • the bow 1 1 has, on the transverse body plan, a convex bow curve 22, as can clearly be seen in Figure 4.
  • the 'streamlined' bow transverse cross-sections and the convex bow curve 22 help to limit the shipping of water onto the deck.
  • FIG. 6 Another peculiarity of the hull 10 according to the invention consists in that, as shown in Figure 6, the abscissa of the center of buoyancy 23, the abscissa of the center of the waterplane 24 and the abscissa of the center of mass are proximate or substantially coincide.
  • the abscissas of the center of the waterplane 24 and of the center of mass substantially coincide, and for this reason the reference numeral 24 in Figure 6 designates a single point in which the center of the waterplane and the center of mass coincide.
  • the distance 25 on the abscissa between the center of buoyancy 23 and the center of mass, or center of the waterplane 24, is less than 1 % of the length 26 of the waterplane.
  • a hull has been devised with a bow substantially of the classic type and therefore more spacious than ax bows and at the same time capable of limiting the accelerations of slamming, thanks to the bow fin and to the streamlined sections on the transverse and horizontal body plans.
  • a hull has been devised that enables stable sailing with contained pitching motions, thanks to the bow fin and to the flared shape of the bow transverse cross-sections.
  • a hull has been devised that, thanks to the peculiar shapes described above of the body plans of the bow part, ensures that the decks can be used and the boat can be maneuvered at least under normal sailing conditions.

Abstract

La présente invention concerne une coque (10) pour bateaux pour des vitesses élevées dans des conditions de mer irrégulières, caractérisé en ce qu'il comprend une proue (11) avec une tige (12) qui présente un profil, sur le plan central longitudinal, qui est incurvé ou rectiligne incliné et arrondi avec une ligne de quille (13) qui se situe dans la région en arc le long d'une ligne qui diverge à partir de la ligne d'eau (14) dans la direction s'étendant depuis le centre du bateau vers la proue, de manière à définir une ailette de proue (15) afin de limiter les accélérations de mouvements de tangage.
PCT/IB2015/057202 2014-09-18 2015-09-18 Coque pour bateaux pour vitesses élevées dans des conditions de mer irrégulières WO2016042527A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2014A000238 2014-09-18
ITPD20140238 2014-09-18

Publications (1)

Publication Number Publication Date
WO2016042527A1 true WO2016042527A1 (fr) 2016-03-24

Family

ID=51951937

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/057202 WO2016042527A1 (fr) 2014-09-18 2015-09-18 Coque pour bateaux pour vitesses élevées dans des conditions de mer irrégulières

Country Status (1)

Country Link
WO (1) WO2016042527A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109018185A (zh) * 2017-06-08 2018-12-18 天津海之星船艇科技有限公司 一种带有斧型艏的三体槽道滑行艇

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4915048A (en) * 1987-04-28 1990-04-10 Corwin R. Horton Vessel with improved hydrodynamic performance
WO1992017366A1 (fr) * 1991-04-01 1992-10-15 Thornycroft, Giles & Co., Inc. Bateau rapide monocoque
EP1873051A1 (fr) * 2006-06-30 2008-01-02 Technische Universiteit Delft Navire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4915048A (en) * 1987-04-28 1990-04-10 Corwin R. Horton Vessel with improved hydrodynamic performance
WO1992017366A1 (fr) * 1991-04-01 1992-10-15 Thornycroft, Giles & Co., Inc. Bateau rapide monocoque
EP1873051A1 (fr) * 2006-06-30 2008-01-02 Technische Universiteit Delft Navire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109018185A (zh) * 2017-06-08 2018-12-18 天津海之星船艇科技有限公司 一种带有斧型艏的三体槽道滑行艇

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