(57) A wakesurfing boat (10) and a hull (12) for a wakesurfing boat. The hull (12) includes
a bow (14), a stern (16), port and starboard bulwarks (17, 18), and a bottom (20)
having a preselected length extending from the bow to the stem. The bottom is configured
with a substantially central ridge (22) and port and starboard ridges (24, 25) extending
below the respective port and starboard bulwarks (17, 18) to define a substantially
M-shaped bottom in cross section with concave portions (26, 27) to port and starboard
of the substantially central ridge (22). Port and starboard laterally rounded sponsoons
(30, 32) extend below the respective port and starboard bulwarks (17, 18) proximate
the stern. A trim wedge (35) projects below the stem. A first rounded stern portion
(38) extends below the stern aft of the trim wedge, and a second rounded stern portion
(39) extends from the port sponsoon to the starboard sponsoon. Ballast tanks (40),
supported by the hull, are selectively fillable with ballast water.
In a dynamic surfing mode, with ballast tanks (40) partially or fully flooded, increased
water flowing through the port and starboard concave portions, combined with increased
ballast, and increased displaced water, increases water resistance to the hull, resulting
in a larger wake wave. Water passing around the rounded lateral spontoons, past the
wedge trim, and past the first and second rounded portions of the stern is directed
toward a convergent zone in the wake, resulting in an improved wake wave shape.
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