Classifications

• • 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
  • B63H25/06—Steering by rudders
  • B63H25/38—Rudders
• • 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
  • B63H25/06—Steering by rudders

Definitions

• OMPI barge can be controlled during towing from a bank to urge the barge away from the bank.
• vessels particularly sailing vessels, of the type having a keel at or adjacent the medial part of the hull and normally steered by a rudder at the rear of the hull.
• One of the problems with vessels, particularly sailing vessels, is to achieve effective control of direction with a minimum of water drag, and with the conventional type of control where a rudder is positioned at the rear of the vessel, generally in line with but to the rear of the keel, the rudder operates in disturbed water due to movement of the hull and keel through the water ahead of the rudder.
• One of the objects of the present invention is to reduce rudder drag as it exists with the assemblies used at the present time. Being more efficient the surface area of the rudder blade can be reduced.
• the rudder instead of being placed at the rear of the vessel is moved forwardly to a position where it operates in relatively undisturbed water, and thus the rudder is placed forward of the keel and preferably in line therewith unless multiple forward rudders are used, so that water flow is first over the surfaces of the rudder and then over the keel.
• Having the rudder placed forward of the keel increases the manoeuvrability of the vessel, including the ability of the vessel to tack through the wind.
• Such a vessel can be constructed much as hereto ⁇ fore but with a forward rudder or rudders, and it will be realised that for instance in racing yachts the use of a forward rudder or rudders with a trailing keel will give substantially less drag than at the present time by maintaining a better water flow along the keel.
• Such a vessel comprises a hull having a depending keel intermediate the bow and stern characterised by rudder means forward of the central part of the keel.
• FIG. 1 is a side elevation of a yacht showing the invention applied by use of a rudder forward of the keel,
• FIG. 2 is a plan view of the outline of the hull of the yacht to show the position of the rudder and the keel,
• FIG. 3 shows how the rudder can be angled or raked in relation to the vertical to give different lift and steering effects, the dotted lines indicating opposite angling of the rudder.
• a vertical rudder could be used but with means to angle it to either position.
• FIG. 4 is a side elevation showing a forward and a rear rudder which could be oppositely steered or independently operated.
• FIG. 5 is a plan view of FIG. 4 showing the forward and rear rudder in relation to the keel
• FIGS. 6 and 7 show in side elevation and plan how forward twin rudders can be arranged, these figures showing also a rear rudder which can be steered oppositely to the forward rudder to assist turning the vessel about the.keel or it can be used as a stabiliser or can be omitted.
• FIGS.. 8 and 9 show the invention applied to a catamaran.
• the hull 1 of the vessel has the usual keel 2 and mast 3 together with its rigging, and has near the bow 4 a rudder 5 projecting downwardly from a stem 6 to which steering torque is applied.
• the rudder is positioned forwardly of the keel 2 to be in relatively undisturbed water and in that position gives a steering effect with the keel 2 acting as a stabiliser about which the steering is generally effected.
• the rudder 11 is forward of the keel 2 and is rotatable about the axis of a steering stem 12 journaled in bearings in the hull so that the the rudder can be angled, but in this embodiment a rear rudder 13 is used and these two rudders 11 and 13 can be angled oppositely to both give a turning moment about the keel 2,
• the two rudders 11 and 13 can be interconnected for simultaneous opposite movement but need not necessarily move in the same ratio or be of similar dimensions, and generally the rudders can be smaller because of the compound steering action.
• a rear rudder 17 is shown in dotted lines this rear rudder 17 allowing further control of steering about the keel 2 by opposite angling of the forward and rear rudders respectively, or the rear rudder 17 may be a fixed or variable angle vane for the purposes of stabilisation.
• FIGS. 8 and 9 In FIGS. 8 and 9 is shown how the invention can be applied to a catamaran, the two hulls 20 and 21 being joined by a platform 22 as usual which can extend longitudinally any required distance.
• a pair of centre-boards 23 and 24 form keels and steering' is by forward rudders 25 and 26 rotationally supported from a strut 27 joining the two hulls 20 and 21.
• the rudders 25 and 26 could project downwardly directly from the hulls 20 and 21 but are preferably mounted as shown to allow them to fold back in shallow water as is usual in catamarans.
• the centre-boards 23 and 24 can be drawn upwards in shallow water.
• Assisting rear rudders could also be used in the manner described with reference to FIGS. 4 and 5 or 6 and 7.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Toys (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=3769282

Family Applications (1)

Country Status (4)

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Citations (4)

Family Cites Families (9)

• 1982
  • 1982-11-19 WO PCT/AU1982/000191 patent/WO1983001934A1/en not_active Application Discontinuation
  • 1982-11-19 JP JP57503401A patent/JPS58501989A/ja active Pending
  • 1982-11-19 EP EP19820903298 patent/EP0094944A4/de not_active Withdrawn
  • 1982-11-29 IT IT8268392A patent/IT8268392A0/it unknown

Patent Citations (4)

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