Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
  • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
  • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
  • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
  • B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
  • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
  • B63H2005/075—Arrangements on vessels of propulsion elements directly acting on water of propellers using non-azimuthing podded propulsor units, i.e. podded units without means for rotation about a vertical axis, e.g. rigidly connected to the hull
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
  • B63H25/48—Steering or slowing-down by deflection of propeller slipstream otherwise than by rudder
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
  • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
  • B63H5/08—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
  • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
  • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters

Definitions

• the present invention relates to a motor vessel with two hulls, also called catamaran.
• Ships of this type are well adapted to sea fishing. In addition to the power and speed gain they provide, and the comfort they bring with greater stability, the installation of a superstructure relatively wide between the two hulls facilitates fishing operations, allowing, for example, the implementation of two trawls.
• ships of this kind have a significant hydrodynamic disadvantage that creates resistance to their advancement. Indeed, the two hulls are always more or less streamlined, so that, towards the front of the ship, the water entering between the hulls is subjected to a compression which has the effect of raising its relative level. Towards the rear, the water rising up a section that is widening is decompressed, with a tendency to decrease its relative level.
• the present invention aims at producing a vessel with two hulls, in which the aforementioned hydrodynamic effect is suppressed or at least minimized.
• the motor vessel with two hulls-or catamaran- comprises a superstructure fixed on these hulls and at least one thruster bearing on the water along a thrust axis and actuated by a motor.
• the thruster is located between the hulls, in the forward half of the ship and, at least in a situation of walking in a straight line, has its thrust axis directed to drive the water in the space included between the two hulls.
• the thruster acts as a circulator placed in a pipe. On the one hand, it sucks the water at its entrance between the hulls and fights the compression effect. On the other hand, by pushing this water backwards between the hulls, it helps to fill the depression caused by the exit of the water.
• the ship comprises two thrusters fixed to the front of each hull, their thrust axes being converging towards the rear of the ship.
• the thrusters collect the water to force its entry into the convergent formed by the front of the hulls and drive it backwards.
• the thrust axes intersect substantially at the rear end of the shells.
• the ship comprises at least one thruster attached to the superstructure in the region where the space between the hulls is the narrowest.
• the shells are profiled so as to present between them, from the front, a first decreasing spacing, then increasing to their rear end, the transition zone forming a neck. This gives the space between the hulls the shape a venturi nozzle that optimizes the effect mentioned above.
• the thrusters are orientable about a vertical axis.
• this feature gives a great way to steer the ship.
• Figure 1 is a plan view, partly in section, of a ship according to the invention, in a first embodiment
• Figure 2 is a view along II-II of Figure 1;
• Figure 3 is a view III-III of Figures 1 and 2;
• Figure 4 is a plan view, partly in section, of a ship according to the invention, in a second embodiment
• Figure 5 is a partial sectional view along V-V of Figure 4.
• FIG. 6 is a block diagram of a planing wing propeller for a two-hull ship; .
• FIG. 7 is a perspective view taken from the sea floor of a vessel equipped with a planing wing propeller;
• Figure 8 is a diagram similar to Figure 6, but relating to a variant;
• Figure 9 is a partial side elevational view of the left hull of a ship with two hulls, seen from the right hull;
• Figure 10 is a rear view of the hull of Figure 9;
• Figure 11 is a partial sectional view along the plane XI-XI of Figure 9;
• Figure 12 is a view similar to Figure 9, but relating to a variant;
• Figure 13 is a rear view of the hull of Figure 12;
• Figure 14 is a side elevational view of a ship with two hulls, the hull on the right is not shown; and.
• Figure 15 is a front view of the ship of Figure 14, in the course of a turn.
• a catamaran 1 comprises two hulls 2 on which is fixed a super structure 3.
• a motor 4 which, via a vertical shaft 5 and of a horizontal shaft 6, actuates a propeller 7, thanks to angle references of a known type.
• the propellers 7 are located in the space between the two shells, in the vicinity of the latter, and their thrust axes 8 are arranged to converge at a point P located at the rear of the ship, in the plane of symmetry 9 of the latter.
• the attachment of the propellers on the hulls is such that these propellers are adjustable around the horizontal shaft 6, transverse to the direction of advancement of the ship.
• the propellers are also steerable in a horizontal plane to help steer the ship.
• Rudder rudders 11 are installed behind the hulls 2.
• the propellers 7 placed obliquely force the water to enter this passage along a preferential path.
• the water driven by the propellers is sent throughout the rear space between the hulls. This results in a first advantage that this region, which otherwise would be in depression, is filled, and a second advantage of the fact that the propeller jets do not come to rub on the hulls.
• the propulsion efficiency is thus improved by minimizing the friction of the water on the hulls and by regulating the flow of water between the hulls by suppressing the succession of compression and depression.
• the suppression, or at least the attenuation, of these pressure phenomena reduces the lateral forces on the hulls and reduces the fatigue of the links. superstructure with hulls.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
• Toys (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9245677

Family Applications (1)

Country Status (7)

Family Cites Families (8)

• 1980
  • 1980-09-05 FR FR8019191A patent/FR2489778A2/fr not_active Withdrawn
• 1981
  • 1981-08-21 EP EP81902378A patent/EP0059195A1/fr not_active Withdrawn
  • 1981-08-21 WO PCT/FR1981/000105 patent/WO1982000811A1/fr not_active Ceased
  • 1981-08-25 IT IT49167/81A patent/IT1143421B/it active
  • 1981-08-27 ES ES505013A patent/ES8206330A1/es not_active Expired
  • 1981-08-31 GR GR65907A patent/GR75751B/el unknown
  • 1981-09-01 OA OA57485A patent/OA06891A/xx unknown

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events