Catamaran-style watercraft with a manually adjustable beam

A catamaran-type watercraft with a manually adjustable beam, comprising:

• a pair of equal-length decked hulls, said hulls connected to one another and held parallel to one another by at least two adjustable-length crossbars, each of said at least two adjustable-length crossbars comprising a stationary slide block and a pair of sliding bar segments, each of said at least two adjustable-length crossbars oriented perpendicularly to and spanning said hulls, with one end of each of said adjustable-length crossbars fixed at a determined placement on a deck surface of one of the hulls and an opposite end of each of said adjustable-length crossbars fixed at a determined placement on a deck surface of a remaining hull of the hulls;
• a rigid, operator-bearing platform deck linked to said hulls by connection to each of said at least two adjustable-length crossbars, said slide blocks being fixably mounted to an underside of said platform deck at locations approximately centered on a longitudinal centerline of said platform deck, with at least one of said slide blocks located near a bow-end of said platform deck and at least one other of said slide blocks located near a stern-end of said platform deck, said platform deck residing in a plane above a highest point of deck surfaces of the hulls;
• a pair of handles one mounted to each of said hulls, said handles being positioned near a transverse center along a top, outer edge of each of said hulls, said handles providing points of interface for applying force required to laterally position said hulls;
• and
• a friction brake comprising a tightening knob accessible to an operator of said watercraft,
• whereby said tightening knob is constructed and arranged to increase and decrease frictional force equally to each of said sliding bar segments of the at least two adjustable-length crossbars.