EP0108004B1 - Bateau de type catamaran - Google Patents

Bateau de type catamaran Download PDF

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Publication number
EP0108004B1
EP0108004B1 EP19830402027 EP83402027A EP0108004B1 EP 0108004 B1 EP0108004 B1 EP 0108004B1 EP 19830402027 EP19830402027 EP 19830402027 EP 83402027 A EP83402027 A EP 83402027A EP 0108004 B1 EP0108004 B1 EP 0108004B1
Authority
EP
European Patent Office
Prior art keywords
hull
boat
waterline
respect
vertical plane
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
Application number
EP19830402027
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0108004A1 (fr
Inventor
Xavier Peyre
Hubert Lecomte
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0108004A1 publication Critical patent/EP0108004A1/fr
Application granted granted Critical
Publication of EP0108004B1 publication Critical patent/EP0108004B1/fr
Expired legal-status Critical Current

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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
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly

Definitions

  • the present invention relates to a catamaran type boat, and more particularly the shape of its hulls.
  • catamarans have two identical hulls, and each hull is generally symmetrical with respect to a vertical plane passing through the bow and parallel to the mean plane of the whole boat. Also usually, and of course outside the areas immediately adjacent to the bow or the rear of the hull, the inner and outer walls of each hull are substantially vertical and parallel. The result for each hull is a symmetrical distribution of the bow wave raised at the front. The zone of maximum amplitude of the resulting transverse wave train, both outside and between the two hulls, is generally located beyond the rear of the boat where the energy contained in these waves disperses.
  • the present invention aims to improve the navigation performance of such a boat, seeking in particular to recover in positive action part of the energy contained in the wave train formed.
  • the invention therefore applies to a catamaran type boat, with two hulls symmetrically arranged with respect to an average vertical plane, and joined by a connecting bridge located above the waterline.
  • each hull has an asymmetry with respect to the vertical plane parallel to the mean plane of the boat and passing through the bow, with a greater and more advanced half-master torque on the inside than on the outside; further back, from the master couple, the inner wall of each hull is in the form of a helical surface with horizontal generators, with an upper generator substantially parallel to the mean plane of the boat, and a lower generator returning under the hull.
  • the shoulders of the inner and outer master couples are located respectively at about 70% and 60% of the length at the waterline; for each hull, and with respect to the vertical plane passing through its bow and parallel to the average vertical plane, the floaters of the internal and external half masters are approximately 55% and 45% of the maximum width at the waterline, respectively .
  • the catamaran is generally constituted in the usual way by two hulls 1 joined by a connecting bridge 2 which supports the superstructures.
  • the entire connecting bridge is, in normal operation, entirely above the highest level of the wave train formed by the bow hulls.
  • the hulls 1 are arranged symmetrically with respect to the vertical median plane 3, and to define the particular shape of a hull, reference is made to the vertical plane 4 passing through its bow 5 and parallel to the median plane 3.
  • FIG. 3 highlights a first characteristic of the shape of each hull, in the normal plane of the waterline.
  • This shape is asymmetrical with respect to plane 4 in that the "shoulder", that is to say the point where the wall of the hull is furthest from plane 4, is more advanced in 7 for the internal wall 8 than in 9 for the outer wall 10.
  • the corresponding half master couple that is to say this maximum distance from the shoulder to the plane 4, is more important for the inner shoulder 7 than for the outer shoulder 9.
  • the shoulders 7 and 9 are respectively distant from the transom of the hull of about 70 and 60% of the total length of the hull at the waterline.
  • the flotation widths of the internal and external half masters are approximately 55% and 45% of the maximum width of the hull, respectively.
  • FIGS. 5 and 6 represent the different couples, the longitudinal position of which is marked in FIG. 3.
  • the right part corresponds to the internal edge, between shells, and the left part to the outside.
  • FIG. 5 represents the pairs 18, 17, 16, 14 and 12 of the front part of the shell. We find there the dissymmetry of the bow and the master couple which is roughly represented by the couple 12.
  • each shell has the pair 10,8,6,4 and 0 of the rear part.
  • the inner wall of the hull takes the form of a surface of substantially helical shape which would have as its generator a substantially straight rectilinear straight line s' pressing by turning on the substantially vertical edge of the torque 10.
  • the generator In the upper position the generator is then substantially parallel to plane 4, and going down its rear part gets closer and closer to plane 4.
  • connecting bridge 2 is provided with a third axial bow 15, located clearly above the waterline. The role of this third stem will be explained later.
  • the relative position and importance of the inner and outer master couples leads to a reduction in the outside bow wave because the bow is refined on the outside.
  • the inner bow wave is amplified and controlled by the venturi shape of the channel between the two hulls, so that the transverse wave train is advanced and brought back between the hulls, with an amplitude at least double that of the external transverse waves.
  • the asymmetrical distribution of the bow wave is carried out without modifying the overall fineness of this bow, that is to say, compared to the usual symmetrical arrangements, without increasing the energy lost in this wave during advancement Of the boat. If we refer to Figure 4 we will see the general shape of the wave train formed in the channel between the two hulls.
  • the helical shape of the rear part of the hull also makes it possible to limit the sinking of the rear when the boat picks up speed.
  • the growth of the volume of submerged hull is in fact amplified by this form, which leads to a rapid but progressive limitation of sinking.
  • the third bow 15 is determined to normally not touch the body of water or even the bow wave formed by the two hulls. By cons in case of a strong tendency to pitch it comes to provide additional support at the front and therefore reduces this pitch.

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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)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
EP19830402027 1982-10-22 1983-10-19 Bateau de type catamaran Expired EP0108004B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8217714 1982-10-22
FR8217714A FR2534873A1 (fr) 1982-10-22 1982-10-22 Bateau de type catamaran

Publications (2)

Publication Number Publication Date
EP0108004A1 EP0108004A1 (fr) 1984-05-09
EP0108004B1 true EP0108004B1 (fr) 1986-10-15

Family

ID=9278508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830402027 Expired EP0108004B1 (fr) 1982-10-22 1983-10-19 Bateau de type catamaran

Country Status (3)

Country Link
EP (1) EP0108004B1 (enrdf_load_stackoverflow)
CA (1) CA1264990A (enrdf_load_stackoverflow)
FR (1) FR2534873A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111643A1 (fr) 2005-04-21 2006-10-26 Catajet Consulting Sarl Dispositif de propulsion pour bateau multi-coque tel que catamaran

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO912295L (no) * 1990-10-30 1992-05-04 Ishikawajima Harima Heavy Ind Katamaran.
SE500778C2 (sv) * 1991-01-30 1994-09-05 Stena Rederi Ab Skrov för flerskrovsfartyg
SE508677C2 (sv) * 1992-07-09 1998-10-26 Stena Rederi Ab Stampningsstabiliserat deplacementfartyg
FR2784958A1 (fr) * 1998-10-26 2000-04-28 Grange Structure navigante de type catamaran a propulsion a aubes et a motorisation electrique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3016861A (en) * 1959-09-04 1962-01-16 Woodbridge P Brown Catamarans
DE1531713A1 (de) * 1967-08-04 1970-01-15 Karl Schmilgeit Doppelrumpfboot
IT1026352B (it) * 1974-02-16 1978-09-20 Weser Ag Catamarano per trasporti oltremare
US3910214A (en) * 1974-04-18 1975-10-07 John W Holter Shallow draft catamaran
FR2485468A1 (fr) * 1980-06-27 1981-12-31 Bernard Blamengin Chalutier bicoque

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111643A1 (fr) 2005-04-21 2006-10-26 Catajet Consulting Sarl Dispositif de propulsion pour bateau multi-coque tel que catamaran
FR2884799A1 (fr) 2005-04-21 2006-10-27 Xavier Peyre Dispositif de propulsion pour bateau multi-coque tel que catamaran

Also Published As

Publication number Publication date
CA1264990A (fr) 1990-01-30
FR2534873A1 (fr) 1984-04-27
EP0108004A1 (fr) 1984-05-09
FR2534873B1 (enrdf_load_stackoverflow) 1985-03-01

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