Abstract: A water borne vessel is supported by a pair of laterally extendible pontoons, which pontoons are extended as a function of both speed and water conditions. A combination of extensible hydraulic cylinder units and threaded shafts selectively provide control of the degree of extension or retraction of the pontoons and maintenance of the pontoons at the selected position of the pontoons and a synchronizing device maintains movement of the pontoons in concert. The configuration of the asymmetric pontoons provides different width immersed surfaces and different wetted areas as a function of the degree of extension to accommodate speed, water conditions, wind and draft for optimum travel.

Abstract: A Water borne vessel is supported by a pair of laterally extendible pontoons, which pontoons are extended as a function of both speed and water conditions. A combination of extensible hydraulic cylinder units and threaded shafts selectively provide control of the degree of extension or retraction of the pontoons and maintenance of the pontoons at the selected position of the pontoons and a synchronizing device maintains movement of the pontoons in concert. The configuration of the asymmetric pontoons provides different width immersed surfaces and different wetted areas as a function of the degree of extension to accommodate speed, water conditions, wind and draft for optimum travel.

Abstract: A deck, gunnel, and two longitudinal hull plates, each having one longitudinal straight edge, are serially attached to one another with two interposed longitudinal bulkheads. After attachment of the gunnel straight edge to the curved edge of the deck, the deck is set at 45.degree. to horizontal to define the curved edge of the vertically positioned first longitudinal bulkhead by scribing a horizontal extension of the curved gunnel edge. The straight edge of the first longitudinal hull plate is secured to the curved edge of the first longitudinal bulkhead and the opposite edge is trimmed and secured to the curved edge of the gunnel. After placing the deck horizontally, the curved edge of the vertically extending second longitudinal bulkhead is scribed as a horizontal extension of the curved edge of the first longitudinal bulkhead.

Abstract: A heat exchanger includes a plurality of in-line segments for alternately enveloping one fluid flow with another fluid flow with the fluid flow exchange occurring at the junction of adjacent segments through a geometric surface mathematically termed a complete embedded minimal surface. An encircling cylindrical shell defined in diameter by the perimeter of the junction surface forms the outer boundary of the in-line segments. The fluid flows may be in the same or opposed directions, depending upon the nature of the results sought by the heat exchanger in a specific environment.

Abstract: A boat of the catamaran type having the usual superstructure mounted on a frame mechanism to which a pair of spaced parallel hulls are pivotably mounted. The frame mechanism includes an actuatable extension apparatus which simultaneously pivots the hulls in laterally opposite directions from a retracted position to a midposition to an extended position to provide the boat with changeable characteristics suitable for various boat operating modes.