SUBSTANCE: hydrocycle includes hull, engine, clutch coupling, reducing gears, control mechanisms. The hull is made streamlined, cigar-shaped, with front transverse step and flat bottom. In the upper part of hull, driver's seat is installed at the sides of which horizontal stabilisers with elevating rudders are fixed. After stabilisers, water-aerial rudder is installed. Inside the middle part of body, through cylindrical channel is made which opens to top surface of hull and ends on flat surface of bottom behind step and is covered from top and from bottom by safety grids. In the upper part of through cylindrical channel, axial-flow air blower is installed behind which antivirtex device is placed. The engine is placed in the fore part of hull, revolving reducing gear and intrachannel reducing gear are connected with axial-flow air blower via clutch coupling. On the top part of hull, T-shaped handle is installed with possibility to turn in horizontal plane and kinematically connected water-aerial rudder and right and left elevating rudders and with possibility of separate turning in vertical plane.
EFFECT: improved technical characteristics of vessel.
The present invention relates to the field of high-speed small-sized shipbuilding and may find application in the design of watercraft.
Known water motolite made in the form of displacement sealed enclosure located inside the air-cooled internal combustion engine, a rotating propeller. The control is performed with one hand using the rudder, which is connected to a lever mounted in the rear of the case. Deadweight 100-120 l, length 1.5-2.0 m, width 0.3-0.4 m, the height of the control knobs of 0.6-0.7 m, the engine exhaust into the water /Patent RF №2023458/.
The disadvantages of the known matalie are: small speed, poor stability in the transverse direction, low safety while driving, even with little excitement.
These shortcomings are due to the design matalie.
It is also known vessel, comprising a housing with a driver's compartment mounted on floats, which is located inside the engine with clutch, mechanically connected to the rotors of the aircraft type large diameter defined by two front and rear at an angle of 25 degrees to the body /Auth. SVID. USSR №312788, 1971/.
Famous ship AVT. SVID. USSR №312788, as the closest to the technical essence and achieved useful results, taken as a prototype.<> The disadvantages of the vessel adopted for the prototype are: large weight ratio, increased risk during operation, large variable loads on the propeller blades operating on the border of two environments, a high probability of breakage of the screws upon approach to the pier.
These drawbacks are due to the design of the vessel.
The object of the present invention is to improve the technical characteristics of the vessel.
The technical result is ensured by the fact that the jet ski, comprising a body, engine, clutch, gear boxes, control mechanisms, according to the invention the casing is sleek cigar-shaped with a front crossover sponson and a flat bottom, has in the upper part of the driver's seat, flanked by fixed horizontal stabilizer with elevators, which installed the air / water wheel, in addition, inside the middle of the hull is a through cylindrical channel opening on the upper surface of the body and ending in a flat surface of the bottom behind the redan, closed at the top and bottom of the safety bars, the longitudinal axis of which is tilted in a vertical plane in the direction of the bow case and makes with the longitudinal axis of the body angle of 45 degrees, in addition, in the upper part of the through cylindrical channel mouth�of oflen axial blower, behind which is placed a rectifying device, and the engine placed in the front of the housing, through the clutch, the rotary gear and ear gear is connected with an axial blower, in addition, in the upper part of the housing has a T-shaped control knob rotatably in a horizontal plane and is kinematically connected to the air / water wheel and with the possibility of separate rotation in the vertical plane of the right and left parts of the control knobs, which are kinematically connected respectively with the right and left elevators.
The invention is illustrated by drawings, where
figure 1 is a perspective view of the watercraft;
figure 2 - view of the watercraft above;
figure 3 - view of the watercraft bottom;
figure 4 - view of the watercraft side view;
figure 5 is a block diagram of the power train;
figure 6 - device arm;
figure 7 - the in-ear device reducer;
figure 8 - diagram of the control mechanism of the watercraft;
figure 9 - diagram of the movement of the watercraft.
The watercraft comprises a housing 1 made streamlined and cigar-shaped with a front crossover sponson 2 and a flat bottom. He has in the upper part of the driver's seat 3, flanked by fixed horizontal stabilizers with 4 left 5 and right�th 6 elevators, which installed the air / water rudder 7. Inside the middle of the hull is a through cylindrical channel 8 opening on the upper surface of the body and ending in a flat surface of the bottom behind the redan. Through cylindrical channel is closed at the top and bottom of the safety bars 9. Longitudinal axis through the cylindrical channel is tilted in a vertical plane in the direction of the bow case and makes with the longitudinal axis of the housing, the angle φ of 45 degrees. In the upper part through a cylindrical axial channel a blower 10, which is placed behind the rectifying device 11. The engine 12 is placed in the front of the housing, through the clutch 13, the rotary valve 14 and ear gear 15 is connected mechanically with axial blower. In the upper part of the housing has a T-shaped control handle, consisting of a vertical axis 16 mounted in bearings 17, the lower end of which is connected to the lever 18, through which control rod 19 is connected to the lever 20 air / water rudder. In the middle part of the vertical axis has a horizontal hollow shaft 21, which is fixed to the axle 22 on which is pivotally mounted to the l-shaped lever 23, having at the ends of the rotating arm 24 management cytotecbrasilia shaft of the engine (gas). Each l-shaped lever is formed integrally with the toothed gear 25, which is in engagement with gear rack 26, which is connected by the rod with a semi-circular sector 27, the sleeve is put on the vertical axis, and he has a circumferential groove in which one end of the lever 28, the second end through which control rod 29 is connected to the lever 30 of the Elevator. Swivel reducer includes a housing 31, closed the lid 32, bearing in which is mounted a driving shaft 33 connected to the output shaft of a clutch, on which are fixed a leading bevel gear 34, which is in engagement with a driven gear 35 fixed on the driven shaft 36 that is installed at an angle to the driving shaft. Ear gear includes a housing 37, closed the lid 38 in which the bearing is installed on the driving shaft 39, mechanically coupled with the output shaft of the rotary gear, which is fixed leading bevel gear 40, which is in engagement with a driven bevel gear 41 mounted on the driven shaft 42 which is mechanically connected with an axial blower. Clutch, drive shaft which is connected to the motor shaft, not shown in the drawings because such couplings are widely known.
The operation of the watercraft.
When the driver took his seat engine runs� 12, the clutch of the clutch 13 and the axial blower 10 is in motion. Torque is transmitted from the engine 12 through the clutch 13 to the drive shaft 33 of the rotary valve 14 and further through the gears 34, 35 is transmitted to the driven shaft 36, then through the drive shaft 39 in-ear gear 15, the gear 40, 41 to the driven shaft 42, which drives the axial blower 10. Rotating, axial blower sucks him and forcefully throws it down. A swirling air stream passing through the rectifying device 11 becomes straightforward and leaving the lower part of the through cylindrical channel 8, creates a reactive force F, which balances the weight force of the jet P, acting at an angle of 45 degrees thereto and, creating an additional force F1that and the ship moves forward with velocity V at a certain height h above the water surface (Fig. 9). The greater the frequency of rotation of the motor shaft 12, the greater the velocity of the jet ski. The height above the surface of the water may vary within certain limits the elevators 5, 6. At low speeds of the engine 12 axial blower 10 creates a small traction force that can't push the body 1 of the water and raise it above the surface. In this case, the watercraft moves in displacement mode and increasing about�rotation of the engine 12 can move on to planing mode, and further, as has been described above.
Yaw control is performed as follows. To rotate right or left, you must turn in the desired direction l-shaped levers 23 holding the handle 24. The vertical axis 16 will rotate with them and turn the lever 18 via small and large control rod 19 is rotated the lever 20, and with it the air / water rudder 7 in the desired direction. Then the jet ski will turn in the right direction.
Longitudinal and lateral stability in flight by means of elevators 5, 6. If the jet ski is tilted in the transverse direction to the left, you must turn on the left l-shaped lever 23, after releasing the locking mechanism, not shown in the drawings. Along with him will turn the toothed gear 23, which will drop down a gear rack 26, and she drops down left semicircular sector 27, which presses on the lever 28 and its other end through the longitudinal thrust 29 will rotate the lever 30. Left the Elevator will go down. The lifting force on the left side will increase and the housing 1 will be in the horizontal position. And Vice versa. In the event of roll to starboard starboard l-shaped lever 23 is moved to the position "on". With him is rotated in the same direction right toothed gear 25, which lowers down the right rack 26, and with it the ol�vy semicircular sector 27, which pulls the right lever 28 and it is through the right longitudinal traction 29 and the lever 30 will turn down the Elevator 3. The lifting force on the starboard side will increase and the housing 1 will be in the horizontal position. When turning the l-shaped levers, which have stoppers in the neutral position, please turn off the buttons, not shown in the drawings. The creation of the roll body 1 when turning is accomplished by the simultaneous rotation of the l-shaped lever 23 on yourself, and another for myself. In this case, the Elevator in the direction of which can take place, will be rotated up and down opposite. Where the Elevator is tilted upward, lifting force will be less, and where the Elevator is turned down, the lifting force will be more. Will the inclination of the housing 1. If the forward part of the hull will begin to climb up, when moving over the surface of the water, you must turn yourself from both of the l-shaped lever 23 and, as described above, the deviation of both rudders down the height of 5, 6. Air flow, hitting in elevators, will be to rotate the housing around the transverse axis counterclockwise, lowering the bow part of the hull and lifting the stern. And Vice versa. When lowering down bow case 1 it is necessary to rotate the l-shaped levers 23 are simultaneously on, after which the case will be turned in�Rog transverse axis in a clockwise direction and will be in the horizontal position. After arriving to the destination the ship is translated in displacement mode and the maneuvering is done at the expense of rudder 7. Reverse jet ski has not. A jet ski can be used for fishing trips, as well as a pleasure craft or rescue boat.
Technical result of the invention is to improve the technical characteristics of a boat.
Jet ski, comprising a body, engine, clutch, gear boxes, control mechanisms, characterized in that the casing is streamlined, cigar-shaped with a front crossover sponson and a flat bottom, has in the upper part of the driver's seat, flanked by fixed horizontal stabilizer with elevators, which installed the air / water wheel, in addition, inside the middle of the hull is a through cylindrical channel opening on the upper surface of the body and ending in a flat surface of the bottom behind the redan, closed at the top and bottom of the safety bars, the longitudinal axis of which is tilted in a vertical plane in the direction of the bow case and makes with the longitudinal axis of the body angle of 45°, in addition, in the upper part through a cylindrical axial channel a blower, which is placed behind the rectifying devices�, with the engine placed in the front of the housing, through the clutch, the rotary gear and ear gear is connected with an axial blower, in addition, in the upper part of the housing has a T-shaped control knob rotatably in a horizontal plane and is kinematically connected to the air / water wheel and with the possibility of separate rotation in the vertical plane of the right and left parts of the control knobs, which are kinematically connected respectively with the right and left elevators.
FIELD: engines and pumps.
SUBSTANCE: invention relates to shipbuilding and can be used also for fabrication of propeller screws for various vessels. For fabrication of the propeller helicoid screw a screw shaft is designed with a possibility of rotation, on the surface of which the blades of the propeller screw of the vessel hull are provisioned in series. The shaft is designed as two halves the end of which is hinge-jointedly placed in an active clamp. The active clamp is fixed in a middle part of a rigid cover with round surface from its bottom side and they are connected functionally with the machine for transfer of the rotation moment to them. The opposite ends of two halves of the shaft are hinge-jointedly placed in a passive clamp which is fix in the top part of the linear rigid cover with a round surface of its opposite sides.
EFFECT: decrease of speed of rotation of running screws is achieved.
SUBSTANCE: invention relates to ship building, particularly to high-speed boats made of polymer composites. This crosswise hollow step is made of polymer composite comprises outer skin and damping elements composed by at least one plate (horizontally arranged diaphragm) located inside the step between skins of the vessel and step to connect vertical lengthwise diaphragms in height decreasing to vessel fore. Note here that lengthwise diaphragms on top and bottom sides of damping elements are shifted in crosswise direction relative to each other. Lengthwise diaphragms and sidewall with skin and damping elements are glued together with the help of thrust foam plastic to be secured to the skin and damping elements and covered by one or several plies of reinforcing material. Vulcanising-on angle-pieces are welded on step sidewalls and step skin. Step cavities arranged one above the other in one or two lengthwise cross-sections of the vessel (relative to ship centreline plane) are filled with high-density foam plastic.
EFFECT: decreased shock loads, lower drag on rough sea.
3 cl, 5 dwg
SUBSTANCE: proposed device comprises casing shaped to hollow truncated cone. Cone is shaped to vessel hull sizes and has its cross-section directed along motion. Case aft is provided with water-jet propulsor secured at sliding joints with clearance between cone case walls and those of water-jet propulsor.
EFFECT: higher efficiency, lower drag and noise.
SUBSTANCE: invention relates to navy exploiting high-navigability and high-speed vessels with power plants running on hydrogen fuel and the product of thermal dissociation of steam, that is, hydrogen and oxygen. Note here that sweet water stored in tanks is used as a heat carrier. This vessel comprises surface hull mounted at streamlined supports of underwater hulls, starting steam plant arranged in surface hull, sweet water tanks, main power plants with steam condensers to use sweet water as power carrier to produce useful power. Said power plants include gas turbine plant and steam plant engaged by shaft with electrical generator connected in electrical protection hardware. Steam units running of used hydrogen and oxygen of thermal dissociation gas turbines are connected via steam lines with steam collectors and plasma chemical heaters of said main power plants and refrigerators for cooling of said used hydrogen and oxygen. Steam units are connected to cooling system running on liquid metal heat carrier of the main power plants connected to steam turbines connected to electrical generators connected to switchboards and to capacitors. Plasma chemical heaters and reactors with their power supplies, motors connected with screw propellers are arranged in underwater hulls. It differs from known designs in that thermal dissociation gas turbine to produce useful power, hydrogen and oxygen incorporates plasma chemical heaters arranged regularly in circle to heat steam to temperature over 2000°C.Said plasma chemical heaters are connected to power supply and connected, on one side, via valve gear with high-temperature and high-pressure steam collector and, on opposite side, with reactors for thermal dissociation of steam to produce hydrogen and oxygen their temperature exceeding 2500°C. Threes are connected to power supply including HF generators and capacitor bank connected with diverging nozzles and cylinders of wave compressors. The latter incorporate water or liquid metal injectors connected to gas turbine fitted on the shaft engaged with electrical generator. Said turbine is provided with discharge pipe to force used hydrogen and oxygen into steam unit. Or, thermal dissociation gas turbine incorporates plasma chemical reactors for thermal dissociation of steam and production of hydrogen and oxygen with temperature over 2500°C and high pressure. Said reactors are connected via valves gears with high-pressure and high-temperature steam collectors on one side and, on the other side, with cylinders connected to aforesaid diverging nozzle and cylinders of wave compressors provided with water or liquid metal injectors connected with gas turbine. Said turbine is provided with discharge pipe to force used hydrogen and oxygen into steam unit. Also, it differs in that plasma chemical heaters, plasma chemical reactors for thermal dissociation of steam and production of hydrogen and oxygen with temperature over 2500°C, or plasma chemical reactors, diverging nozzles and wave compressor cylinders are provided with jackets for circulation of aforesaid coolants for cooling reactors for thermal dissociation of steam and production of hydrogen and oxygen with temperature over 2500°C and high pressure. Also, it differs in that plasma chemical heaters or reactors incorporate housing with jacket, cover and cap and electrode-cathode secured in housing, in electric insulation ply. Said cathode communicates with cooled nozzle, the anode, arranged at the angle to axes of said reactors. Or, plasma chemical heaters or reactors are arranged in one unit with light ionising additive injectors built therein and arranged in the axis of reactors. Note here that valve mechanism with high-pressure-and-temperature inlet valve is arranged at plasma chemical heater housing. Also, it differs in that valve mechanism comprises steam feed pipe and discharge valve with constrictor and spring. The latter is composed of tubular slider plugged on one side and fitted in cylinder secured at the housing. Said cylinder has openings in it and inlet valve tubular slider walls to intake steam in plasma chemical heater or reactor. Its differs in that said reactor is made of ceramic material with circular inductor arranged thereon and composed of copper pipes with jacket for circulation and cooling of reactor walls and inductor by water. Also, it differs in that steam plat for combustion of hydrogen and oxygen incorporates axial compressor connected with long pipes, combustion chambers arranged regularly in circle. They include injectors to ignite hydrogen in oxygen by injection of gaseous jets of conducting fluid thermal dissociation products with diverging nozzles and wave compressor cylinders connected to steam turbine. The latter is fitted on shaft engaged with electrical generator and incorporates branch pipe to discharge used steam into condenser. Besides, it differs in that said injector comprises casing with conducting liquid feed pipes. Said pipes are connected to cylindrical channels arranged inside the casing in insulating material ply. Electrodes connected to pulse generator are arranged on one side of said channels while, on opposite side, nozzle are arranged directed at the angle to each other and communicated with blast chamber of injector that has perforated bottom for escape of gas jets.
EFFECT: clean atmosphere.
SUBSTANCE: invention relates to ship building, namely to marine propulsors for shallow-water flat-bottomed vessels. The marine propulsor contains pressurised water supply pipeline and nozzle. Vessel's fore end is made at the front as part of cylindrical or spherical shell. On the front outside surface, water is pumped under pressure from nozzle from above or from above-behind. This water spreading down over shell surface and interacting with water beneath waterline of flat-bottomed vessel creates pushing force.
EFFECT: creation of traction force.
4 cl, 4 dwg
SUBSTANCE: hull lines and structural layout are proposed for an afterend of an underwater semi-submersible large-tonnage ship with protruding parts.
EFFECT: reduced resistance of shape to ship motion, increased coefficient of use of cargo volume, optimal placement of EU and a rudder propeller unit for improved controllability.
6 cl, 4 dwg
SUBSTANCE: invention relates to design of hull lines of a ship hull with higher icebreaking capability having a stem with a bulb. Eyes of a ship hull are proposed, having a bottom in the area of a midship frame with low or zero deadrise and boards close to vertical ones, comprising a bulb having in its upper part a straight or slightly bent rib, formed in the diametral plane during connection of the right and left surfaces of the bulb at the spatial angle of 30-150°, having an inclination forward to 30° to the plane of the waterline and crossing planes (levels) of the highest and lowest positions of the rated waterline of the ship in the head for different versions of its load. The upper surface of the bulb is made with gradual rise from its front part to the area of coupling with main hull lines, the length of the body part of the bulb in the longitudinal direction makes 4-5 theoretical spaces. Cross sections of the bulb vary slightly along the width from 1 to 3 of the theoretical frame. Coupling of the eyes with the bulb lines is made to form concavity of buttocks, stretching at the angle downwards from the start of coupling on the stem to the area of approximately 3-4 of the theoretical frame.
EFFECT: increased icebreaking capability of a ship and speed of its movement.
5 cl, 3 dwg
SUBSTANCE: invention relates to ship building, particularly to designing of ocean fishery ships for self-contained and all-weather fishing far from ports in storm and ice areas of far east seas of Russia and north-west of Pacific. Proposed fishing boat features relatively notable draft, streamlined fore waterlines and bent stem, cruise aft with slip for drag-net and side pockets for storage and servicing of drag-net boards on aft deck right behind the towing winch. Fishing board has the hull with hydrodynamic compensation for roll and pitch at rough sea with aft drag-net deck covered from winds and mooring, anchoring and cargo devices arranged at boat fore in solid heated superstructure that covers the crew from flooding by rough storm waves and prevents accumulation of ice at high-intensity icing.
EFFECT: enhanced performances, higher safety of navigation in stormy and icy latitudes.
SUBSTANCE: vessel includes hull, rudder house with radar aerial, at least one deck, hold, vessel tanks, appliances for loading/unloading in bulk of liquid and semiliquid cargoes, machinery space, screw propeller, rudder. Vessel tanks are located in parallel to each other along and at both sides of hull beneath its waterline and connected with it and with each other by means of holders. On the rudder house crossbar with signalling elements is secured which elements indicate underwater position of vessel tanks. The vessel tanks are provided with tail fins and rudders. The holders are made hollow with possibility of pipeline transfer of liquid and semiliquid cargoes through them.
EFFECT: marine freight traffic increase.
4 cl, 6 dwg
SUBSTANCE: invention relates to water transport, namely to sporting-and-pleasure boats being means for user physical capabilities improvement, their recovery and performance incoordination. Sporting and cruising catamaran is proposed which includes deck with floats, propulsor and containing paddle impeller in the form of pressure chamber to be used in hypoxic, aerobic and vestibular mode with possibility of rotation and vertical lifting from water using jacks in the form of pneumatic cells, with endless tracks and seats inside the impeller and with possibility to convert stopped and fully lifted from water pressure chamber into cabin.
EFFECT: sporting-and-pleasure boat functionality enhancement.
FIELD: shipbuilding; manufacture of ship stabilization systems equipment with deeply-submerged hydrofoils.
SUBSTANCE: 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.
EFFECT: enhanced efficiency.
FIELD: shipbuilding; building boats-catamarans for scientific work and pleasure boats for inspection of surface of fresh water and sea water basins.
SUBSTANCE: 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.
EFFECT: extended field of application.
6 cl, 4 dwg
FIELD: shipbuilding; designing fore portion of ship's hull with sonar antenna dome.
SUBSTANCE: 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.
EFFECT: improved seaworthiness and running characteristics of ship.
FIELD: shipboard equipment.
SUBSTANCE: 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.
EFFECT: reduced noise interference to hydrophones.
7 cl, 10 dwg
FIELD: shipbuilding and aircraft manufacture; devices for reduction of resistance of water or air to motion of ship or aircraft.
SUBSTANCE: 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.
EFFECT: enhanced efficiency.
FIELD: transport engineering; reduction of resistance to motion by forming viscoelastic coats on bodies.
SUBSTANCE: 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).
EFFECT: enhanced efficiency of reduction of friction resistance.
15 cl, 4 dwg, 1 tbl
FIELD: shipbuilding; shipboard units for creating additional thrust.
SUBSTANCE: device is made in form of additional bottom located in fore extremity of ship and engageable with main bottom by means of inclined surface.
EFFECT: improved sea-going properties of ship and habitability for crew.
FIELD: shipbuilding; shipboard units for creating additional thrust.
SUBSTANCE: device is made in form of additional bottom located in fore extremity of ship and engageable with main bottom by means of inclined surface.
EFFECT: improved sea-going properties of ship and habitability for crew.
FIELD: shipbuilding; building of multi-hulled ships.
SUBSTANCE: 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.
EFFECT: improved service characteristics of ship and improved sea-worthiness of ship.
10 cl, 5 dwg
FIELD: shipbuilding; anti-drift units.
SUBSTANCE: proposed anti-drift unit includes flexible parts of shell plating which may be sagged inside and outside the hull by means of drive.
EFFECT: enhanced compensation of ship's drift.