A boat hull having a vertical plane of symmetry, a waterline plane including a waterline of the hull, and a vertical transverse beam plane including the hull beam, said hull comprising at least in part a first dual circular curved hull outer surface area extending at least in part below the waterline plane, said first dual circular curved hull outer surface area being defined by a geometric area generated as a result of sweeping an first imaginary circular curved vertically oriented arc segment located on one side of the plane of symmetry and having a first arc length and a first radius centered at a first center about an imaginary axis of rotation extending vertically in the beam plane, said first center being located below said waterline plane outboard of the hull on a same side of the plane of symmetry as the first imaginary circular curved arc segment, said first imaginary axis of rotation being located on an opposite side of the plane of symmetry from the first center, wherein said first imaginary circular curved vertically oriented arc segment and first center are initially located in said beam plane, with a lower end of said first imaginary circular curved vertically oriented arc segment or an extension of said lower end approaching said plane of symmetry or a plane extending parallel with the plane of symmetry located on the same side of the plane of symmetry as the first center tangentially and an upper end of said first imaginary circular curved vertically oriented arc segment or an extension of an upper end of said first imaginary circular curved vertically oriented arc segment tangentially approaching the waterline plane or a plane extending parallel with the waterline plane, characterized in that: the sweeping of the first imaginary circular curved vertically oriented arc segment defining the first dual circular curved hull outer surface area being caused by rotating the first imaginary circular curved vertically oriented arc segment forward and aft of the beam plane about said imaginary axis of rotation so that the loci of the upper end of the first imaginary circular curved vertically oriented arc segment fore and aft of the beam plane follow a second imaginary circular curved arc segment having a second radius centered at a second center that is located on said imaginary axis of rotation, said second center and said second imaginary curved arc segment being located in the waterline plane or a plane extending parallel with said waterline plane, said second radius being greater than the first radius, wherein all portions of the first dual circular curved hull outer surface area defined by the geometric area resulting from sweeping the first imaginary circular curved vertically oriented arc segment are located on the same side of the plane of symmetry; so that, said first dual circular curved hull outer surface area comprises a circular curve form that is circular concave relative to the plane of symmetry when viewed horizontally parallel with the plane of symmetry, and circular convex relative to the plane of symmetry when viewed vertically parallel with said plane of symmetry, with said first dual circular curved hull outer surface area extending in a vertical sense from a lower area at or approaching the plane of symmetry or a plane extending parallel to the plane of symmetry located on the same side of the plane of symmetry as the first center, upwardly toward and approaching or intersecting the waterline plane or a plane extending parallel to said waterline plane, and in a horizontal sense from an area forward of the beam plane to an area aft of the beam plane. the sweeping of the first imaginary circular curved vertically oriented arc segment defining the first dual circular curved hull outer surface area being caused by rotating the first imaginary circular curved vertically oriented arc segment forward and aft of the beam plane about said imaginary axis of rotation so that the loci of the upper end of the first imaginary circular curved vertically oriented arc segment fore and aft of the beam plane follow a second imaginary circular curved arc segment having a second radius centered at a second center that is located on said imaginary axis of rotation, said second center and said second imaginary curved arc segment being located in the waterline plane or a plane extending parallel with said waterline plane, said second radius being greater than the first radius, wherein all portions of the first dual circular curved hull outer surface area defined by the geometric area resulting from sweeping the first imaginary circular curved vertically oriented arc segment are located on the same side of the plane of symmetry; so that, said first dual circular curved hull outer surface area comprises a circular curve form that is circular concave relative to the plane of symmetry when viewed horizontally parallel with the plane of symmetry, and circular convex relative to the plane of symmetry when viewed vertically parallel with said plane of symmetry, with said first dual circular curved hull outer surface area extending in a vertical sense from a lower area at or approaching the plane of symmetry or a plane extending parallel to the plane of symmetry located on the same side of the plane of symmetry as the first center, upwardly toward and approaching or intersecting the waterline plane or a plane extending parallel to said waterline plane, and in a horizontal sense from an area forward of the beam plane to an area aft of the beam plane.