IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0550977
(2012-07-17)
|
등록번호 |
US-8726823
(2014-05-20)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
10 |
초록
▼
A boat hull form includes a dual circular curved outer surface area that is circular concave relative to the plane of symmetry of the hull when viewed horizontally parallel with the plane of symmetry of the hull, and circular convex relative to the plane of symmetry when viewed vertically parallel w
A boat hull form includes a dual circular curved outer surface area that is circular concave relative to the plane of symmetry of the hull when viewed horizontally parallel with the plane of symmetry of the hull, and circular convex relative to the plane of symmetry when viewed vertically parallel with the plane of symmetry of the hull, with the hull outer surface area extending in a vertical sense from a lower area extending in a direction that tangentially intersects the plane of symmetry or optionally a plane extending parallel with the plane of symmetry on the same side of the plane of symmetry as the dual circular curved outer surface area and upwardly in a direction tangentially intersecting the waterline plane of the hull or a plane extending parallel to the waterline plane.
대표청구항
▼
1. A boat hull (10) having a vertical plane of symmetry (PS), a waterline plane (WP) including a waterline of the hull, and a vertical transverse beam plane (PB) including the hull beam, said hull comprising at least in part a first dual circular curved hull outer surface area (12) extending at leas
1. A boat hull (10) having a vertical plane of symmetry (PS), a waterline plane (WP) including a waterline of the hull, and a vertical transverse beam plane (PB) including the hull beam, said hull comprising at least in part a first dual circular curved hull outer surface area (12) extending at least in part below the waterline plane (WP),said first dual circular curved hull outer surface area (12) being defined by a geometric area generated as a result of sweeping an first imaginary circular curved vertically oriented arc segment (14) located on one side of the plane of symmetry (PS) and having a first arc length (L1) and a first radius (R1) centered at a first center (C1) about an imaginary axis of rotation (X) extending vertically in the beam plane (PB),said first center (C1) being located below said waterline plane (WP) outboard of the hull on a same side of the plane of symmetry (PS) as the first imaginary circular curved arc segment (14),said first imaginary axis of rotation (X) being located on an opposite side of the plane of symmetry (PS) from the first center (C1),wherein said first imaginary circular curved vertically oriented arc segment (14) and first center (C1) are initially located in said beam plane (PB), with a lower end (15) of said first imaginary circular curved vertically oriented arc segment (14) or an extension of said lower end (15) approaching said plane of symmetry (PS) or a plane (PP) extending parallel with the plane of symmetry (PS) located on the same side of the plane of symmetry as the first center (C1) tangentially and an upper end (16) of said first imaginary circular curved vertically oriented arc segment (14) or an extension of an upper end (16) of said first imaginary circular curved vertically oriented arc segment (14) tangentially approaching the waterline plane (WP) or a plane extending parallel with the waterline plane (WP),the sweeping of the first imaginary circular curved vertically oriented arc segment (14) defining the first dual circular curved hull outer surface area (12) being caused by rotating the first imaginary circular curved vertically oriented arc segment (14) forward and aft of the beam plane (PB) about said imaginary axis of rotation (X) so that the loci of the upper end (16) of the first imaginary circular curved vertically oriented arc segment (14) fore and aft of the beam plane (PB) follow a second imaginary circular curved arc segment (18) having a second radius (R2) centered at a second center (C2) that is located on said imaginary axis of rotation (X),said second center (C2) and said second imaginary curved arc segment (18) being located in the waterline plane (WP) or a plane extending parallel with said waterline plane (WP),said second radius (R2) being greater than the first radius (R1),wherein all portions of the first dual circular curved hull outer surface area (12) defined by the geometric area resulting from sweeping the first imaginary circular curved vertically oriented arc segment (14) are located on the same side of the plane of symmetry (PS);so that, said first dual circular curved hull outer surface area (12) comprises a circular curve form that is circular concave relative to the plane of symmetry (PS) when viewed horizontally parallel with the plane of symmetry (PS), and circular convex relative to the plane of symmetry (PS) when viewed vertically parallel with said plane of symmetry (PS), with said first dual circular curved hull outer surface area (12) extending in a vertical sense from a lower area at or approaching the plane of symmetry (PS) or a plane (PP) extending parallel to the plane of symmetry (PS) located on the same side of the plane of symmetry)PS) as the first center (C1), upwardly toward and approaching or intersecting the waterline plane (WP) or a plane extending parallel to said waterline plane (WP), and in a horizontal sense from an area forward of the beam plane (PB) to an area aft of the beam plane (PB). 2. The boat hull according to claim 1, including an opposite first dual circular curved hull outer surface area (12M) located on the opposite side of said plane of symmetry (PS) from said first dual circular curved hull outer surface area (12) and wherein said opposite first circular curved hull outer surface area (12M) is a mirror image of said first dual circular curved hull outer surface area (12). 3. The boat hull according to claim 2, wherein forward portions of said first and opposite dual circular curved hull outer surface areas (12, 12M) converge at the plane of symmetry (PS) forward of the beam plane (PB). 4. The boat hull according to claim 2, including a planing hull form (24) located in an area aft of said first and opposite dual circular curved hull outer surface areas (12, 12M). 5. The boat hull according to claim 4, said planing hull form (24) having a selected dead rise with a V center. 6. The boat hull according to claim 2, including bow extensions (22) of said first and opposite first dual circular curved hull outer surface areas (12, 12M) extending above the waterline plane (WP) of the boat hull over opposed forward portions of the hull. 7. The boat hull according to claim 1, including at least a second dual circular curved hull outer surface area (31) located below and inboard of said first dual circular curved hull outer surface area (12) on a same side of the plane of symmetry (PS) of the hull as said first dual circular curved hull outer surface area (12), said second dual circular curved hull surface area (31) being defined by a geometric area generated as a result of sweeping a third imaginary circular curved vertically oriented arc segment (30) located on the same side of the plane of symmetry (PS) as the first dual circular curved outer hull surface area (12) and having a third arc length (L3) and a third radius (R3) centered at third center (C3) about said imaginary axis of rotation (X),said third center (C3) being located below said waterline plane (WP) outboard of the hull on a same side of the plane of symmetry (PS) as the third imaginary circular curved vertically oriented arc segment (30),said third radius (R3) being smaller than the first radius (R1),wherein said third imaginary circular curved vertically oriented arc segment (30) and third center (C3) are initially located in said beam plane (PB), with a lower end of said third imaginary circular curved vertically oriented arc segment (30) or an extension of said lower end approaching said plane of symmetry (PS) or a plane (PP) extending parallel to said plane of symmetry (PS) located on the same side of said plane of symmetry as the third center (C3) tangentially and an upper end of said third imaginary circular curved vertically oriented arc segment (30) or an extension of an upper end of said third imaginary circular curved vertically oriented arc segment (30) tangentially approaching a plane extending parallel to and below the waterline plane (WP),the sweeping of the third imaginary circular curved vertically oriented arc segment (30) being caused by rotating the third imaginary circular curved vertically curved arc segment (30) forward and aft of the beam plane (PB) about the imaginary axis of rotation (X) so that the loci of an upper end of the third imaginary circular curved vertically oriented arc segment (30) fore and aft of the beam plane (PB) follow a fourth imaginary circular curved arc segment (L4) having a fourth radius (R4) centered at a fourth center (C4) that is located below the second center (C2) along the imaginary axis of rotation (X),said fourth radius (R4) being greater than the third radius (R3),said third imaginary circular curved vertically oriented arc segment (30) being located below and inboard of the first dual circular curved hull outer surface area (12),said fourth center (C4) and said fourth imaginary circular curved arc segment (L4) being located in a plane extending parallel with and below the waterline plane (WP),wherein all portions of the second dual circular curved hull outer surface area (31) defined by the geometric area resulting from sweeping said second imaginary circular curved vertically oriented arc segment (30) are located on the same side of the plane of symmetry (PS);so that, said second dual circular curved outer hull surface area (31) comprises a circular curve form that is circular concave relative to the plane of symmetry (PS) when viewed horizontally parallel to the plane of symmetry (PS), and circular convex relative to the plane of symmetry (PS) when viewed vertically parallel to said plane of symmetry (PS), with said second circular curved hull outer surface area (31) extending in a vertical sense from a lower area at or approaching the plane of symmetry (PS) or a plane (PP) extending parallel to said plane of symmetry located on the same side of the plane of symmetry (PS) as the third center (C3) upwardly toward and approaching or intersecting a plane extending parallel to said waterline plane (WP), and in a horizontal sense from an area forward of the beam plane (PB) to an area aft of the beam plane (PB), andwherein said second dual circular curved hull outer surface area (31) intersects at an upper edge thereof a lower edge of the first dual circular curved outer hull surface area (12) and forms with said first dual circular curved hull outer surface area (12) a continuous hull outer surface area, with the second dual circular curved outer surface area (31) being closer to the plane of symmetry (PS) than the first dual circular curved hull outer surface area (12). 8. The boat hull according to claim 7, including an opposite second dual circular curved hull outer surface area (31M) that is a mirror image of said second dual circular curved hull outer surface area (31), and that is located on the opposite side of said plane of symmetry (PS) from said second dual circular curved hull outer surface area (31). 9. The boat hull according to claim 8, wherein forward portions of said dual circular curved hull outer surface areas (12, 31) converge at the plane of symmetry (PS) forward of the beam plane (PB). 10. The boat hull according to claim 8, including a planing hull form (24) located in an area aft of said dual circular curved hull outer surface areas (12, 31). 11. The boat hull according to claim 7, including a third dual circular curved hull outer surface area (33) located below and inboard of said second dual circular curved hull outer surface area (31) on a same side of the plane of symmetry (PS) of the hull as said first and second dual circular curved hull outer surface areas (12, 31), said third dual circular curved hull outer surface area (33) being defined by a geometric area generated as a result of sweeping a fifth imaginary circular curved vertically oriented arc segment (32) located on the same side of the plane of symmetry (PS) as the first and second dual circular curved hull outer surface areas (12, 31) and having a fifth arc length (L5) having a fifth radius (R5) centered at a fifth center (C5) about said imaginary axis of rotation (X),said fifth center (C5) being located below said waterline plane (WP) outboard of the hull on a same side of the plane of symmetry (PS) as the fifth imaginary circular curved vertically oriented arc segment (32),said fifth radius (R5) being smaller than the first radius (R1);wherein said fifth imaginary circular curved vertically oriented arc segment (32) and fifth center (C5) are initially located in said beam plane (PB), with a lower end of said fifth circular arc segment or an extension of said lower end approaching said plane of symmetry (PS) or a plane (PP) extending parallel to said plane of symmetry (PS) located on the same side of the plane of symmetry as said fifth center (C5) tangentially and an upper end of said fifth imaginary circular curved vertically oriented arc segment (32) or an extension of an upper end of said third imaginary circular curved vertically oriented arc segment (32) tangentially approaching a plane extending parallel with and below the waterline plane (WP),the sweeping of the fifth imaginary circular curved vertically oriented arc segment (32) defining the third dual circular curved hull outer surface area (33) being caused by rotating the fifth imaginary circular curved vertically oriented arc segment (32) about said imaginary axis of rotation (X) forward and aft of the beam plane (PB) so that the loci of an upper end of the fifth imaginary circular curved vertically oriented arc segment (32) fore and aft of the beam plane (PB) follow a sixth imaginary circular curved arc segment (L6) having a sixth radius (R6) centered at a sixth center (C6) that is located along the imaginary axis of rotation (X) below the fourth center (C4),said fifth imaginary circular curved arc segment (32) being located below and inboard of the second circular curved hull outer surface area (31),said sixth center (C6) and said sixth imaginary circular curved arc segment (L6) being located in a plane extending parallel with and below the waterline plane (WP),said sixth center (C6) being located on an opposite side of the plane of symmetry (PS) from the fifth center (C5),said sixth radius (R6) being greater than the fifth radius (R5),wherein all portions of the third dual circular curved hull outer surface area (33) defined by the geometric area resulting from sweeping said third imaginary circular curved vertically oriented arc segment (32) are located on the same side of the plane of symmetry (PS),so that, said third dual circular curved hull outer surface area (33) comprises a circular curve form that is circular concave relative to the plane of symmetry (PS) when viewed horizontally parallel to the plane of symmetry (PS), and circular convex relative to the plane of symmetry (PS) when viewed vertically parallel to the plane of symmetry, with said third dual circular curved hull outer surface area (33) extending in a vertical sense from a lower area at or approaching the plane of symmetry (PS) or a plane (PP) extending parallel to the plane of symmetry (PS) located on the same side of the plane of symmetry (PS) as the fifth center (C5) upwardly toward and approaching or intersecting a plane extending parallel to said waterline plane, and in a horizontal sense from an area forward of the beam plane (PB) to an area aft of the beam plane (PB), andwherein said third dual circular curved hull outer surface area (33) intersects at an upper edge thereof a lower edge of the second circular curved hull outer surface area (31) and forms with said first and second circular curved hull outer surface areas (12, 31) a continuous dual circular curved hull outer surface area, with the third dual circular curved hull outer surface area (33) being closer to the plane of symmetry (PS) than the second dual circular curved hull outer surface area (31). 12. The boat hull according to claim 11, including an opposite third dual circular curved hull outer surface area (33M) that is a mirror image of said third dual circular curved hull outer surface area (33), and that is located on the opposite side of said plane of symmetry (PS) from said third dual circular curved hull outer surface area (33). 13. The boat hull according to claim 11, wherein the forward portions of said first, second and third dual circular curved hull outer surface areas (12, 31, 33) converge at the plane of symmetry (PS) forward of the beam plane (PB). 14. The boat hull according to claim 12, including a planing hull form (24) located in an area aft of said first, second and third dual circular curved hull outer surface areas (12, 31, 33). 15. A method of generating a form of a first dual circular curved outer surface area (12) of a boat hull, the hull having a waterline plane (WP), a vertical beam plane (PB) and a vertical plane of symmetry (PS), comprising the steps: sweeping an imaginary first circular curved vertically oriented arc segment (14) located on one side of the plane of symmetry (PS) and having a first arc length (L1) and a first radius (R1) centered at a first center (C1) about an imaginary axis of rotation (X) extending vertically in the beam plane (PB) to generate a geometric area defining said first dual circular curved outer surface area (12),said first center (C1) being located below said waterline plane (WP) outboard of the hull on the same side of the plane of symmetry (PS) as the first imaginary circular curved vertically oriented arc segment (14),said imaginary axis of rotation (X) being located on an opposite side of the plane of symmetry (PS) from the first center (C1)said imaginary first circular curved vertically oriented arc segment (14) and said first center (C1) initially being located in the vertical beam plane (PB), with said first imaginary circular curved vertically oriented arc segment (14) at a lower end (15) thereof, or an extension of said lower end, approaching tangentially said plane of symmetry (PS) or a plane (PP) extending parallel to said plane of symmetry (PS) located on the same side of the plane of symmetry (PS) as the first center (C1), and an upper end (16) of the first imaginary circular curved vertically oriented arc segment (14), or an extension of said upper end (16), approaching tangentially the waterline plane (WP), or a plane extending parallel with the waterline plane (WP),the sweeping of the first imaginary circular curved vertically oriented arc segment (14) being carried out so as to rotate the first imaginary circular curved vertically oriented arc segment (14) forward and aft of the beam plane (PB) so the loci of an upper end (16) of the first imaginary circular curved vertically oriented arc segment (14) forward and aft of the beam plane (PB) follow a second imaginary circular curved arc segment (18) centered at a second center (C2), said second center (C2) being located on said axis of rotation (X),said second center (C2) and said second imaginary circular curved arc segment (18) being located in the waterline plane (WP) or a plane extending parallel with said waterline plane (WP),said second radius (R2) being greater than the first radius (R1),while rotating the first imaginary circular curved vertically oriented arc segment (14) fore and aft of the beam plane (PB), maintaining all of the geometric area resulting from sweeping said first imaginary circular curved vertically oriented arc segment (14) defining the first hull outer surface (12) on the same side of the plane of symmetry (PS),so that the first dual circular curved hull outer surface area (12) is formed as a curve that is circular concave relative to the plane of symmetry (PS) when viewed horizontally parallel to the plane of symmetry (PS), and circular convex relative to the plane of symmetry (PS) when viewed vertically parallel to the plane of symmetry (WP), with said first dual circular curved hull outer surface area (12) extending in a vertical sense from a bottom area at or approaching the plane of symmetry (PS) or a plane (PP) extending parallel to the plane of symmetry (PS) located on the same side of the plane of symmetry (PS) as the first center (C1) upwardly toward and intersecting the waterline plane (WP) or a plane extending parallel with said waterline plane (WP), and in a horizontal sense from an area forward of the beam plane (PB) to an area aft of the beam plane (PB). 16. The method according to claim 15, including forming an extension (22) of the dual circular curved hull outer surface area (12) above the waterline plane (WP) at a hull bow area. 17. The method according to claim 15, including forming an opposite first dual circular curved hull outer surface area (12M) in mirror image of said first dual circular curved hull outer surface area (12) on an opposite side of the plane of symmetry (PS) from the first dual circular curved hull surface area (12). 18. The method according to claim 15, including forming forward portions of said first and opposite first dual circular curved hull outer surface areas (12, 12M) so they converge at the plane of symmetry (PS) forward of the beam plane (PB). 19. The method according to claim 18, including forming a planing hull form (24) aft of the first and opposite first dual circular curved hull outer surface areas (12, 12M)), including forming a smooth transition area along the hull between the first and opposite dual circular curved outer hull surface areas (12,12a) and the planing hull form (24). 20. The method according to claim 15, including forming a second dual circular curved hull outer surface area (31) located below and inboard of said first dual circular curved hull outer surface area (12) on a same side of the plane of symmetry (PS) of the hull as said first dual circular curved hull outer surface area (12), generating the shape of said second dual circular curved hull surface area (31) by sweeping a third imaginary circular curved vertically oriented arc segment (30) located on the same side of the plane of symmetry (PS) as the first dual circular curved hull outer surface area (12) and having a third arc length (L3) having a third radius (R3) centered at a third center (C3) about said imaginary axis of rotation (X),wherein said third center (C3) is located below said waterline plane (WP) outboard of the hull on a same side of the plane of symmetry (PS) as the third imaginary circular curved vertically oriented arc segment (30),said third radius (R3) being smaller than the first radius (R1),said third imaginary circular curved vertically oriented arc segment (30) being located below and inboard of the first hull outer surface area (14),wherein said imaginary third imaginary circular curved vertically oriented arc segment (30) and the third center (C3) are initially located in said beam plane (PB), with a lower end of said third imaginary circular curved vertically oriented arc segment (30) or an extension of said lower end approaching said plane of symmetry (PS) or plane (PP) extending parallel with said plane of symmetry (PS) located on the same side of the plane of symmetry (PS) as said third center (C3) tangentially and an upper end of said third imaginary circular curved vertically oriented arc segment (30) or an extension of an upper end of said third circular curved vertically oriented arc segment (30) tangentially approaching a plane extending parallel to and below the waterline plane (WP),causing the sweeping of the imaginary third imaginary circular curved vertically oriented arc segment (30) defining the second dual circular curved hull outer surface area (31) by rotating the third imaginary circular curved vertically oriented arc segment (30) fore and aft of the beam plane (PB) about the imaginary axis of rotation (X) so that the loci of an upper end of the third imaginary circular curved vertically oriented arc segment fore and aft of the beam plane (PB) follow a fourth imaginary circular curved arc segment (L4) having a fourth radius (R4) centered at a fourth center (C4) that is located below the second center (C2) along the imaginary axis of rotation (X),said fourth radius (R4) being greater than the third radius (R3),said fourth center (C4) and said fourth imaginary circular curved arc segment (L4) being located in a plane extending parallel with and below said waterline plane (WP),wherein all portions of the second dual circular curved hull outer surface area (31) defined by the geometric area resulting from sweeping said second imaginary circular curved vertically oriented arc segment (30) are located on the same side of the plane of symmetry (PS),so that, said second dual circular curved hull outer surface area (31) comprises a circular curve form that is circular concave relative to the plane of symmetry (PS) when viewed horizontally along the plane of symmetry (PS) and circular convex relative to the plane of symmetry (PS) when viewed vertically along the plane of symmetry (WP), with said second dual circular curved hull outer surface area (31) extending in a vertical sense from a lower area at or approaching the plane of symmetry (PS) or a plane (PP) extending parallel with said plane of symmetry (PS) located on the same side of the plane of symmetry as the third center (C3) upwardly toward and approaching or intersecting a plane extending parallel to said waterline plane, and in a horizontal sense from an area forward of the beam plane (PB) to an area aft of the beam plane (PB), andlocating said second dual circular curved hull outer surface area (31) so that it intersects at an upper edge thereof a lower edge of the first dual circular curved outer hull surface area (12) and forms with said first dual circular curved hull outer surface area (12) a continuous hull outer surface area, with the second dual circular curved hull outer surface area (31) being closer to the plane of symmetry (PS) than the first dual circular curved hull outer surface area (12). 21. The method according to claim 20, including forming an opposite second dual circular curved outer hull outer surface area (31M) in mirror image of said second dual circular curved hull outer surface area (31) on an opposite side of the plane of symmetry (PS) from the second circular curved hull outer surface area. 22. The method according to claim 20, including forming a planing hull bottom area (24) aft of the dual circular curved hull outer surface areas (12, 31), including forming a smooth transition area along the hull between the circular curved first and second dual circular curved outer hull surface areas (12, 31) and the planing hull bottom area. 23. The method according to claim 20, including forming a third dual circular curved hull outer surface area (33) located vertically below and inboard of said second dual circular curved hull outer surface area (31) on a same side of the plane of symmetry (PS) of the hull as said first and second dual circular curved hull outer surface areas (12, 31), generating the shape of said third dual circular curved hull outer surface area (31) by sweeping a fifth imaginary circular curved vertically oriented arc segment (32) located on the same side of the plane of symmetry (PS) as the first and second dual circular curved outer surface area 12, 31 having a fifth arc length (L5) having a fifth radius (R5) centered at a fifth center (C5) about said imaginary axis of rotation (X),said fifth center (C5) being below said waterline plane (WP) outboard of the hull on a same side of the plane of symmetry (PS) as the fifth imaginary circular curved arc segment (32),said fifth radius (R5) being smaller than the first radius (R1),said fifth imaginary circular curved arc segment (32) being located below and inboard of the second dual circular curved hull outer surface area (31),wherein said fifth imaginary circular curved arc segment (32) and said fifth center (C5) are initially located in said beam plane (PB), with a lower end of said fifth circular curved arc segment (32) or an extension of said lower end approaching said plane of symmetry (PS) or a plane (PP) extending parallel with said plane of symmetry (PS) located on the same side of the plane of symmetry as the fifth center (C5) tangentially and an upper end of said fifth imaginary circular curved arc segment (32) or an extension of an upper end of said fifth imaginary circular curved arc segment (32) tangentially approaching a plane extending parallel with and below the waterline plane (WP),causing sweeping of the fifth imaginary circular curved vertically oriented arc segment (32) defining the third circular curved hull outer surface area (33) by rotating the fifth imaginary circular curved vertically oriented arc segment (32) about the imaginary axis of rotation (X) forward and aft of the beam plane (PB) so that the loci of an upper end of the fifth imaginary circular curved vertically oriented arc segment (32) fore and aft of the beam plane (PB) follow a sixth imaginary circular curved arc segment (L6) having a sixth radius (R6) centered at a sixth center (C6) that is located below said fourth center (C4) along said imaginary axis of rotation (X),said sixth radius (R6) being greater than the fifth radius (R5),said sixth center (C6) and said imaginary sixth imaginary circular curved arc segment (L6) being located in a plane extending parallel with and below said waterline plane (WP),wherein all portions of the third dual circular curved hull outer surface area (33) defined by the geometric area resulting from sweeping said third imaginary circular curved arc segment (32) are located on the same side of the plane of symmetry (PS),so that, said third dual circular curved hull outer surface area (33) comprises a circular curve form that is circular concave relative to the plane of symmetry (PS) when viewed horizontally along the plane of symmetry (PS) and circular convex relative to the plane of symmetry (PS) when viewed vertically along the plane of symmetry (WP), with said third dual circular curved hull outer surface area (33) extending in a vertical sense from a lower area at or approaching the plane of symmetry (PS) or a plane (PP)extending parallel with the plane of symmetry(PS) located on the same side of the plane of symmetry as the fifth center (C5) upwardly toward and approaching or intersecting a plane extending parallel to said waterline plane, and in a horizontal sense from an area forward of the beam plane (PB) to an area aft of the beam plane (PB), andlocating said third dual circular curved hull outer surface area (33) so that it intersects at an upper edge thereof a lower edge of the second dual circular curved outer hull surface area (31) and forms with said first and second dual circular curved hull outer surface areas (12, 31) a continuous dual circular curved hull outer surface area, with the third dual circular curved hull outer surface area (33) being closer to the plane of symmetry (PS) than the second dual circular curved hull outer surface area (31). 24. The method according to claim 23, including forming an opposite third dual circular curved hull outer surface area (12bM) in mirror image of said third dual circular curved hull outer surface area (33) on an opposite side of the plane of symmetry (PS) from the third dual circular curved hull outer surface area (12b). 25. The method according to claim 24, including forming the forward portions of said dual circular curved hull outer surface areas (12, 31, 33) so they converge at the plane of symmetry (PS) forward of the beam plane (PB). 26. The method according to claim 24, including forming a planing hull form (24) located in an area aft of said dual circular curved hull outer surface areas (12, 31, 33).
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