Multi-hull boat

A boat comprising a pair of inflatable hulls, a pair of torsionally stiff longitudinal beams, one for each hull, securing means attaching each said longitudinal beam to the top of the respective hull, the beam extending substantially the whole length of the hull when the latter is inflated, a pair of cross beams interconnecting the longitudinal beams at spaced positions along the lengths of the longitudinal beams and serving to support a trampoline therebetween, means securing the cross beams to the longitudinal beams at said spaced positions against torques generated in the longitudinal beams, said hulls being of circular cross section with the maximum diameter at a station between said cross beams, said hulls continuously tapering from said maximum diameter station while retaining a circular cross section, the diameter of each hull at the stern thereof being equal to its diameter at a further station spaced between the bow and maximum diameter station thereon, said longitudinal beams being straight, said securing means including portions positively holding the top surface of the tapering circular cross section fore and aft portions of the hull snugly up against the bottom of said straight longitudinal beam substantially from the stern to a departure station near the hull bow, wherein, as seen from the side, the portion of each hull extending from the stern to said station near the bow has its top surface maintained substantially linear in profile by said longitudinal beam but has its bottom surface maintained in an exaggerated convexly rounded profile with maximum depth adjacent said maximum diameter station, said hull tapering forwardly beyond said further station to terminate in a pointed tip spaced beneath the front end portion of said longitudinal beam.