Scuba wing e. n. boitsova

The invention relates to shipbuilding and can be used when creating a Multihull - polimernoe the inventive palimanan has two displacement of the housing 1, two hydrolyze 2 connected to the housings 1 two removable transverse beams 3 and 4

Proposed marine hydrofoil is provided with units for determination of its speed and depth of submergence mounted on it and connected to shipboard computer. Mounted additionally on hydrofoil are units for determination of side slip and angle of attack which are also connected to shipboard computer.

Proposed boat-catamaran has floats located symmetrically relative to longitudinal axis and rigidly interconnected; floats are made in form of elastic gas-tight cylindrical skegs-pneumatic balloons. Each of them is located between flexible couplings and is engageable with its lower and upper surfaces by means of changeable safety ski and one of pylons. Pylons give support for disk-shaped cabin consisting of convex spherical upper and lower sections hermetically interconnected through intermediate all-round vision segment provided with bearing flange, control system and power plant mounted on transom plate which is secured on pylon bases. Boat is provided with float draft control mechanism which is made in form of gaseous working medium pressure regulators in cavities of floats-pneumatic balloons; it is connected with compressor receiver by means of gas lines. Power plant is provided with hinged column which is swivel in horizontal plane. Each float is provided with additional skegs-pneumatic balloons giving support for main skeg-pneumatic balloon along longitudinal axis. Lower spherical section of said cabin is provided with blisters in form of hermetic port lights in bottom. Pylons and changeable safety ski are provided with cradles engageable with main and additional skegs-pneumatic balloons by equidistant surfaces. Bearing flange of intermediate all-round vision segment of disk-shaped cabin is secured on pylons.

Ship's fore extremity includes inclined stem with V-shaped frames in the vicinity of design waterline, recess and section of bottom projecting downward; fore point of this bottom is located at level lying in lower half of draft. Frames are inclined towards CL at acute angle in the area of fore portion of projecting part of bottom. Tapering of waterlines near aft portion of section of bottom (dome) projecting downward ensures smooth curve of cross-sectional area near its aft portion; length of section of bottom (dome) projecting downward ranges from 0.1 to 0.2 of hull length over design waterline and ratio of projecting section of bottom (dome) to hull breadth on design waterline ranges from 0.25 to 0.4. Depth of lower point of projecting section of bottom (dome) exceeds hull draft amidships by 0.9 to 1.2 times; deadrise angle of projecting section of bottom (dome) is equal to 29° at lower point and cross-section of projecting portion of bottom (dome) is between stations 1 and 2.

Proposed load-bearing structure is made in form of wing provided with toothed plates (16) on free edges for breaking the tip vortex formed due to pressure of liquid. Ridges made on edges of plates are used for fast dissipation of vortices in line of hydrophones (30) towed by ship (31) in conducting seismic trials at sea.

Proposed device is made in form of taper semi-oval cover plate secured to side and provided with narrow inlet hole and wide outlet hole. Narrow inlet hole is oriented forward in way of motion.

Proposed method includes the following operations: (a) estimation of characteristics of turbulent boundary layer at preset rate of free flow making use of boundary conditions for rigid surface having the same shape and size as surface with coat; characteristics include thickness of boundary layer, phase rate and frequency corresponding to maximum energy-carrying disturbances, profiles of average rate, distribution of Raynolds stresses, distribution of shear stress on wall and friction resistance; (b) selection of properties of material of coat including density, complex shear modulus and thickness of coat at which coat subjected to action of stimulating function identical to load formed by this boundary layer and determined at stage (a) ensures maximum flux of energy with no disturbance in surface; (c) estimation of characteristics of boundary layer on coat at preset rate of free flow making use of amplitude of oscillations and energy flux corresponding to properties of material selected at stage (b) including the average rate profiles, distribution of Raynolds stresses, distribution of shear stresses on wall and friction resistance; (d) determination of reduction of friction resistance in percent as ratio to difference between magnitudes of friction resistance with and without coat estimated at stages (a) and (c) to friction resistance determined at stage (a) for determination of quantitative magnitudes of composition and configuration of coat; (e) forming viscoelastic coat from material or combination of materials selected at stages (a) thru (d).

Device is made in form of additional bottom located in fore extremity of ship and engageable with main bottom by means of inclined surface.

Device is made in form of additional bottom located in fore extremity of ship and engageable with main bottom by means of inclined surface.

Proposed catamaran has two hulls in form of oblong cylinders with cone-shaped fore and aft extremities, decks, propellers and steering gear. Hulls are interconnected by means of horizontal transversal rods in above-water portion and longitudinal keel girder which is connected with hulls by means of inclined rods in under-water portion of hulls. Said connection members form truss together with hulls in form of triangular prism; adjoining to bases of this prism are pointed sections in form of triangular pyramids whose vertices lie on ends of keel girder. Angle at which faces of prism intersect is equal to 40-70 deg. Ratio of width between axes of hulls to their length is 0.5-1.5 and ratio of length of hulls to length of keel girder is equal to 0.3-0.9.

Proposed anti-drift unit includes flexible parts of shell plating which may be sagged inside and outside the hull by means of drive.

According to first version, proposed propeller is provided with permanent magnets mounted on the outside of magnetic hull in form of parallel parallelepipeds secured by one pole on ship's hull in parallel with direction of motion; opposite poles are pressed to magnetically conducting plane. Electrodes are mounted on inter-pole planes inside rectangular cavities thus formed which are electrically insulated from material of magnets, ship's hull and magnetically-conducting plane. Electrodes are connected in pairs by their poles. According to second version, bow-shaped magnets are secured inside nonmagnetic hull of ship perpendicularly to direction of motion in line by alternating poles. Magnetically-conducting plane is opposite to hull. Electrodes connected with current source by their alternating poles are located between ship's hull and magnetically-conducting plane in parallel to direction of ship's motion.