Extendable multihull boat

An extendable multihull boat, comprising:

• an upper deck extending from a bow to a stern and comprising an underside frame;
• a pair of abeam hulls located beneath the upper deck and fixedly connected to the underside frame of the upper deck;
• a pair of longitudinally elongated guide rails positioned between the abeam hulls beneath the upper deck and fixedly connected to at least one of the underside frame of the upper deck and the abeam hulls;
• a lower deck located below the underside frame of the upper deck between the abeam hulls, wherein the lower deck longitudinally translates relative to the upper deck, the abeam hulls, and the elongated guide rails between a stowed position and a fully extended position, wherein the lower deck is positioned beneath the upper deck in the stowed position, and wherein a forward section of the lower deck extends forward of the bow of the upper deck in the fully extended position while at least a portion of an aft section of the lower deck remains underneath the upper deck in the fully extended position;
• an amidships hull located beneath and fixedly attached to the lower deck, wherein the amidships hull is longitudinally arranged between the abeam hulls and longitudinally translates with the lower deck relative to the upper deck, the abeam hulls, and the elongated guide rails between the stowed position and the fully extended position, and wherein the amidships hull provides buoyant support to the lower deck in the stowed position and in the fully extended position;
• a pair of side beams respectively connected to a port side and a starboard side of at least one of the lower deck and the amidships hull;
• and
• a pair of sliding members selected from the group consisting of a pair of rollers, a pair of guide bars, and a combination thereof, wherein the pair of sliding members are respectively connected to the pair of elongated guide rails, and wherein the pair of side beams respectively engage and slide on the pair of sliding members.

An extendable multihull boat, comprising:

• an upper deck extending from a bow to a stern and comprising an underside frame;
• a pair of abeam hulls located beneath the upper deck and fixedly connected to the underside frame of the upper deck;
• a pair of longitudinally elongated guide rails positioned between the abeam hulls beneath the upper deck and fixedly connected to at least one of the underside frame of the upper deck and the abeam hulls;
• a lower deck located below the underside frame of the upper deck between the abeam hulls, wherein the lower deck longitudinally translates relative to the upper deck, the abeam hulls, and the elongated guide rails between a stowed position and a fully extended position, wherein the lower deck is positioned beneath the upper deck in the stowed position, and wherein a forward section of the lower deck extends forward of the bow of the upper deck in the fully extended position while at least a portion of an aft section of the lower deck remains underneath the upper deck in the fully extended position;
• an amidships hull located beneath and fixedly attached to the lower deck, wherein the amidships hull is longitudinally arranged between the abeam hulls and longitudinally translates with the lower deck relative to the upper deck, the abeam hulls, and the elongated guide rails between the stowed position and the fully extended position, and wherein the amidships hull provides buoyant support to the lower deck in the stowed position and in the fully extended position;
• and
• a plurality of fasteners, wherein the fasteners hold the amidships hull in a fixed position relative to the lower deck when the amidships hull and the lower deck are in the stowed position and in the fully extended position.