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A wakesurfing boat and a hull for a wakesurfing boat. The hull includes a bottom having a preselected length extending from a bow to a stern. The bottom includes a central ridge and port and starboard ridges extending below respective port and starboard bulwarks to define a substantially M-shaped bo

A wakesurfing boat and a hull for a wakesurfing boat. The hull includes a bottom having a preselected length extending from a bow to a stern. The bottom includes a central ridge and port and starboard ridges extending below respective port and starboard bulwarks to define a substantially M-shaped bottom with concave portions to port and starboard of the central ridge. Port and starboard sponsoons extend below the port and starboard bulwarks proximate the stern. A trim wedge projects below the stern. Two rounded stern portions are provided proximate the stern. In a dynamic surfing mode, with selectively-fillable ballast tanks partially or fully flooded, water flowing through the port and starboard concave portions, combined with the ballast, increases resistance to the hull, resulting in a larger wake wave. Water passing around the structural features proximate the stern is directed toward a convergent zone in the wake, resulting in an improved wake wave shape.

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1. A wakesurfing boat comprising: a hull comprising a bow, a stern, a center of gravity CG, a port bulwark, a starboard bulwark, a length L, a beam B, a first waterline defined on the bulwarks when the hull is at rest in a body of water, and a bottom extending for a preselected length from the bow t

1. A wakesurfing boat comprising: a hull comprising a bow, a stern, a center of gravity CG, a port bulwark, a starboard bulwark, a length L, a beam B, a first waterline defined on the bulwarks when the hull is at rest in a body of water, and a bottom extending for a preselected length from the bow to the stern, the bottom comprising:a substantially central ridge extending a first depth below the hull proximate the bow, the substantially central ridge extending along the length at progressively decreasing depths below the hull to a substantially planar bottom portion midway between the bow and the stern;port and starboard ridges extending second depths below the hull proximate the respective port and starboard bulwarks, defining with the substantially central ridge a generally M-shaped cross section, with port and starboard concave portions between the substantially central ridge and the respective port and starboard ridges, the port and starboard ridges extending at progressively decreasing depths below the hull to the substantially planar bottom portion;port and starboard lateral sponson extending beneath the port and starboard bulwarks proximate the stern; anda trim wedge extending below the stern, and extending forward toward the substantially planar portion;a ballast system supported by the hull comprising a plurality of ballast tanks and a ballast watering system, the ballast tanks configured and positioned in the hull to selectively receive ballast water to trim the hull, while moving through the water, in one of at least two operating modes, the at least two operating modes including:a cruising mode, wherein the ballast tanks are substantially empty, the hull has a first trim angle and a second waterline, the hull displacing a first amount of water, and a first amount of water entering openings at the bow of the port and starboard concave portions of the generally M-shaped bottom and traversing the length in the port and starboard concave portions, combining to subject the hull to a first amount of water resistance; anda dynamic surfing mode, wherein the ballast tanks are at least partially filled or filled with ballast water, the hull has a second trim angle and a third waterline, higher on the bulwarks than the second waterline, the hull displacing a second amount of displaced water greater than the first amount of displaced water, and a second amount of water, greater than the first amount of water, entering the openings at the bow of the port and starboard concave portions of the generally M-shaped bottom and traversing the length in the port and starboard concave portions, combining to subject the hull to a second amount of water resistance greater than the first amount of water resistance;a deck; andcounter-rotating propellers. 2. The wakesurfing boat of claim 1, wherein each of the port and starboard lateral sponson has a rounded lateral edge. 3. The wakesurfing boat of claim 1, wherein a length to beam ratio (L/B) of the hull is less than 3.0. 4. The wakesurfing boat of claim 1, further comprising a third operating mode, a static surfing mode, wherein the ballast tanks are partially filled with ballast water, and the hull has a third trim angle, intermediate the first and second trim angles. 5. The wakesurfing boat of claim 1, wherein the trim wedge is configured such that when the hull is moving in the dynamic surfing mode, the trim wedge interferes with flow of water below the bottom of the hull, directing the water on port and starboard faces of the wedge to a convergent zone in the wake of the boat. 6. The wakesurfing boat of claim 1, wherein the ballast watering system includes at least one pump for adding the ballast water to, and removing the ballast water from, the ballast tanks. 7. The wakesurfing boat of claim 1, further comprising a first generally rounded stern portion below the stern and aft of the trim wedge. 8. The wakesurfing boat of claim 7, further comprising a second generally rounded portion at the stern extending from the port sponson to the starboard sponson. 9. The wakesurfing boat of claim 1, wherein the ballast tanks comprise a plurality of sets of single and dual tanks, the sets of dual tanks being positioned at generally symmetrical locations with respect to one another on the hull, and wherein at least a first set of dual tanks are positioned at least partially forward of the CG, and a single tank having a volume greater than the first set of dual tanks is positioned proximate the stern. 10. The wakesurfing boat of claim 1, wherein when the hull moves through the body of water in the cruising mode, the hull generates at least one wake wave having a first height and a first shape. 11. The wakesurfing boat of claim 10, wherein when the hull moves through the body of water in the dynamic surfing mode, as a result of the increased ballast, the increased amount of displaced water, the second amount of water passing through the port and starboard concave portions of the generally M-shaped bottom, the second greater amount of water resistance to the hull, and the water passing past the lateral sponson and the trim wedge, the hull generates at least one wake wave having a second height that is greater than the first height, and a second shape. 12. A hull for a wakesurfing boat, the hull comprising: a bow, a stern, a center of gravity CG, a port bulwark, a starboard bulwark, a length L, a beam B, a first waterline defined on the bulwarks when the hull is at rest in a body of water, and a bottom extending for a preselected length from the bow to the stern, the bottom comprising:a substantially central ridge extending a first depth below the hull proximate the bow, the substantially central ridge extending along the length at progressively decreasing depths below the hull to a substantially planar bottom portion midway between the bow and the stern;port and starboard ridges extending second depths below the hull proximate the respective port and starboard bulwarks, defining with the substantially central ridge a generally M-shaped cross section with port and starboard concave portions between the substantially central ridge and the port and starboard ridges, the port and starboard ridges extending at progressively decreasing depths below the first waterline to the substantially planar bottom portion;port and starboard lateral sponson extending beneath the port and starboard bulwarks proximate the stern; anda trim wedge extending below the stern, and extending forward toward the substantially planar portion; anda ballast system supported by the hull comprising a plurality of ballast tanks and a ballast watering system, the ballast tanks configured and positioned in the hull to selectively receive ballast water to trim the hull, while moving through the water, in one of at least two operating modes, the at least two operating modes including:a cruising mode, wherein the ballast tanks are substantially empty, the hull has a first trim angle and a second waterline, the hull displacing a first amount of water, and a first amount of water entering openings at the bow of the port and starboard concave portions of the generally M-shaped bottom, and traversing the length in the port and starboard concave portions, combining to subject the hull to a first amount of water resistance; anda dynamic surfing mode, wherein the ballast tanks are at least partially filled or filled with ballast water, the hull has a second trim angle and a third waterline, higher on the bulwarks than the second waterline, the hull displacing a second amount of displaced water greater than the first amount of displaced water, and a second amount of water, greater than the first amount of water, entering the openings at the bow of the port and starboard concave portions of the generally M-shaped bottom, and traversing the length in the port and starboard concave portions, combining to subject the hull to a second amount of water resistance greater than the first amount of water resistance. 13. The hull of claim 12, wherein each of the port and starboard lateral sponson has a rounded lateral edge. 14. The hull of claim 12, wherein a length to beam ratio (L/B) of the hull is less than 3.0. 15. The hull of claim 12, further comprising a third operating mode, a static surfing mode, wherein the ballast tanks are partially filled with ballast water, and the hull has a third trim angle, intermediate the first and second trim angles. 16. The hull of claim 12, wherein when the trim wedge is configured such that when the hull is moving in the dynamic surfing mode, the trim wedge interferes with flow of water below the bottom of the hull, directing the water on port and starboard faces of the wedge to a converging zone in the wake of the hull. 17. The hull of claim 12, wherein the ballast watering system includes at least one pump for adding the ballast water to, and removing the ballast water from, the ballast tanks. 18. The hull of claim 12, further comprising a first generally rounded stern portion below the stern and aft of the trim wedge. 19. The hull of claim 18, further comprising a second generally rounded stern portion at the stern extending from the port sponson to the starboard sponson. 20. The hull of claim 12, wherein the ballast tanks comprise a plurality of sets of single and dual tanks, the sets of dual tanks being positioned at generally symmetrical locations with respect to one another on the hull, and wherein at least a portion of a first set of dual tanks is positioned forward of the CG, and a single tank having a volume greater than the first set of dual tanks, is positioned proximate the stern. 21. The hull of claim 12, wherein when the hull moves through the body of water in the cruising mode, the hull generates at least one wake wave having a first height and a first shape. 22. The hull of claim 21, wherein when the hull moves through the body of water in the dynamic surfing mode, as a result of the increased ballast, the increased amount of displaced water, the second amount of water passing through the port and starboard concave portions of the generally M-shaped bottom, the second greater amount of water resistance to the hull, and the water passing past the sponson and the trim wedge, the hull generates at least one wake wave having a second height that is greater than the first height, and a second shape. 23. The hull of claim 12, wherein the length L is a length selected from the group consisting of the length of a yacht, the length of a cruiser, and the length of a sport boat. 24. The hull of claim 12, wherein each of the lateral sponson comprises a rounded fillet of approximately 150 mm. 25. The hull of claim 12, wherein the port and starboard concave portions are configured to suppress air from entering under the bow. 26. The wakesurfing boat of claim 1, wherein the length L is a length selected from the group consisting of the length of a yacht, the length of a cruiser, and the length of a sport boat. 27. The wakesurfing boat of claim 1, wherein each of the lateral sponson comprises a rounded fillet of approximately 150 mm. 28. The wakesurfing boat of claim 1, wherein the port and starboard concave portions of the hull bottom are configured to suppress air from entering under the bow. 29. A hull for a wakesurfing boat, the hull comprising: a bow, a stern, a center of gravity CG, a port bulwark, a starboard bulwark, a length L, a beam B, a first waterline defined on the bulwarks when the hull is at rest in a body of water, and a bottom extending for a preselected length from the bow to the stern, the bottom comprising:a substantially central ridge extending a first depth below the hull proximate the bow, the substantially central ridge extending along the length at progressively decreasing depths below the hull to a substantially planar bottom portion midway between the bow and the stern;port and starboard ridges extending second depths below the hull proximate the respective port and starboard bulwarks, defining with the substantially central ridge a generally M-shaped cross section with port and starboard concave portions between the substantially central ridge and the port and starboard ridges, the port and starboard ridges extending at progressively decreasing depths below the first waterline to the substantially planar bottom portion;port and starboard lateral rounded sponson extending beneath the port and starboard bulwarks proximate the stern, each rounded sponson comprising a rounded fillet; anda trim wedge extending below the stern, and extending forward toward the substantially planar portion;a first rounded stern portion fixed to the trim wedge aft of the trim wedge; anda second rounded stern wedge extending between the port sponson and the starboard sponson; anda ballast system supported by the hull comprising a plurality of ballast tanks and a ballast watering system, the ballast tanks configured and positioned in the hull to selectively receive ballast water to trim the hull, while moving through the water, in one of at least two operating modes, the at least two operating modes including:a cruising mode, wherein the ballast tanks are substantially empty, the hull has a first trim angle and a second waterline, the hull displacing a first amount of water, and a first amount of water entering openings at the bow of the port and starboard concave portions of the generally M-shaped bottom, and traversing the length in the port and starboard concave portions, combining to subject the hull to a first amount of water resistance; anda dynamic surfing mode, wherein the ballast tanks are at least partially filled or filled with ballast water, the hull has a second trim angle and a third waterline, higher on the bulwarks than the second waterline, the hull displacing a second amount of displaced water greater than the first amount of displaced water, and a second amount of water, greater than the first amount of water, entering the openings at the bow of the port and starboard concave portions of the generally M-shaped bottom, and traversing the length in the port and starboard concave portions, combining to subject the hull to a second amount of water resistance greater than the first amount of water resistance;wherein the port and starboard concave portions are configured to suppress air from entering under the bow; andwherein the trim wedge, the port and starboard lateral rounded sponson, and the first and second stern rounded portions, are each configured to direct water into a convergent zone in the wake of the hull.