POLYMARAN Russian patent published in 1995 - IPC

FIELD: shipbuilding. SUBSTANCE: polymaran is provided with central hydro-ski located above lateral hydro-skis which are mounted at external sides of displacement hulls. Transverse beams are detachable. Main transverse beams are located in center portion of polymaran and auxiliary beams are connected with end portions of displacement hulls and hydro-skis. Displacement hulls and their hydro-skis are sectional in construction; each section is provided with tightly closed hatch; fore portions of lateral hydro-skis and aft portion of central hydro-ski are provided with superstructures whose interior is brought in communication with respective chambers of end section of hydro-skis, thus forming multifunctional containers. Central hydro-ski is provided with helmsman's seat in cargo section; each lateral section has seats for oarsmen; two of them are located between main transverse beams and aft seat for oarsman is located in each lateral hydro-ski between aft main and auxiliary transverse beams. Mounted on external sides of lateral hydro-skis are longitudinal beams for oarlocks; displacement hulls are located at distance from each other equal to at least 1/3 of their length and are provided with superstructures; decks of displacement hulls are located on common deck at one level; length of each of them exceeds length of hydro-skis; hydro-skis are located at different levels relative to displacement hulls whose bottoms are located below bottoms of hydro-skis which are located below common deck of superstructures of displacement hulls. Width of each hydro-ski exceeds its height. Displacement hulls are provided with keel beams and side boards each of which is located between respective lateral hydro-ski and displacement hull shifted sternward from center of its length for sinking it and folding in horizontal position towards stern. Each displacement hull is provided with oval section in plane of frame and each hydro-ski has section in form of semicircle in lower portion in plane of frame. End parts of each hydro-ski are rounded off; maximum width of each hydro-ski exceeds maximum width of each displacement hull, apertures between adjacent displacement hulls and hydro-skis are covered with platings in form of plates fastened to their edges with the aid of holes provided in them. Polymaran has technological aperture in its fore portion which is bounded with inner edges of displacement hulls, fore edge of central hydro-ski and section of perimeter of fore auxiliary transverse beam. Aft section of central hydro-ski is provided with well for outboard motor; steering gear is provided with aft transverse rod and tillers which are articulated to the rod; tillers and rod form parallel link mechanism; tillers are provided with steering boxes for shifting the rudder and changing the angle of inclination of each tiller relative to deck. Blade of each rudder is articulated in its box on horizontal transverse hinge for projection beyond lower lines of aft portion of bottom of each displacement hull. V-shaped mast of polymaran rigging is provided with struts fitted with heels; mast is hinged to fore main transverse beam in attachment units; each attachment unit is located between respective displacement hulls and lateral hydro-ski. Mast is provided with central stay for securing the boom and front leech of main sail; central stay is located in plane of V-shaped mast and is connected with heels of its struts by means of braces; rigging is provided with additional fore-and-aft sail mounted on mast. EFFECT: enhanced reliability. 7 cl, 4 dwg