A boat hull having an upper hull section, a pair of spaced apart
substantially parallel elongated outer sponsons extending from a forward
portion to a stern portion of a bottom of the upper hull section, the
outer sponsons and upper hull section defining a tunnel therebetween; and
an elongated center sponson extending along the bottom of the upper hull
and positioned in the tunnel between and substantially parallel to the
pair of outer sponsons and having a forward section with an upwardly
extending trailing step wall defining an upward step in the center
sponson, and an aft section that is located aft of the forward section,
the aft section having an upwardly curved leading edge intersecting the
step wall of the forward section. The upper hull section can have planar
bottom.
