Tri-sponson boat hull and method of making boat hulls

A boat hull having a bow and a stern, the hull comprising:

• 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, the outer sponsons each having an inner wall extending substantially perpendicular to a water line, an outer chine and a bottom wall joining bottom edges of the inner wall and the outer chine, the bottom wall being substantially planar aft of a leading edge thereof and angled upwardly from the inner wall to the outer chine, the upward angle of the bottom wall relative to the water line being less than that of the outer chine;
• 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, the center sponson extending forwardly of the outer sponsons and having a upward step along its length with a portion of the center sponson leading the step having a greater depth than a portion of the center portion aft of the step, the center sponson being of lesser depth than the outer sponsons.

A boat hull having a bow and a stern, the hull comprising:

• an upper hull section;
• a pair of spaced apart substantially parallel elongated outer sponsons extending from a forward portion to a stem portion of a bottom of the upper hull section, the outer sponsons and upper hull section defining a tunnel therebetween;
• an elongated center sponson extending along the bottom of the upper hull section and positioned in the tunnel between and substantially parallel to the pair of outer sponsons;
• and
• a wing-shaped lift spoiler pivotally mounted between the pair of outer sponsons, the spoiler passing beneath an aft section of the center sponson and being adjustable to control trim of the boat hull during use.

A method of making a tri-sponson boat hull comprising:

• forming from reinforced fibre material, using an upper hull mold, an upper hull section having a substantially planar underbody;
• forming from reinforced fibre material, using first and second outer sponson molds, an elongated first outer sponson and an elongated second outer sponson;
• forming from reinforced fibre material, using a center sponson mold, an elongated center sponson;
• arranging the upper hull section, first and second outer sponsons and the center sponson such that the first and second outer sponsons extend from a forward section to a stem portion of the underbody of the upper hull section, the outer sponsons and underbody defining a tunnel therebetween, and the center sponson extends along the underbody of the upper hull and is positioned in the tunnel between and substantially parallel to the first and second outer sponsons;
• and
• securing the outer sponsons and center sponson to the upper hull using reinforced fibre material.