WO2001007314A2

WO2001007314A2 - Sailing boat

Info

Publication number: WO2001007314A2
Application number: PCT/NL2000/000528
Authority: WO
Inventors: Hubertus Adriaan Pothoven
Original assignee: Hubertus Adriaan Pothoven
Priority date: 1999-07-27
Filing date: 2000-07-25
Publication date: 2001-02-01
Also published as: NL1012716C2; AU6322400A; EP1204548A2; WO2001007314A3

Abstract

The disclosure relates to a sailing boat (1) comprising an underwater ship (2) provided with a keel (4) and at least one rudder (5', 55''), wherein the keel, viewed in the boat's direction of sailing, is located at the front, and behind the keel, just passed midship, the boat is at both sides provided with a bilge rudder. Preferably each bilge rudder is articulated, having a first fixed portion and a second portion, pivotingly coupled with the first portion. The first portion is then, for example, embodied as skeg, and the second portion forms a rudder blade.

Description

Sailing boat

The invention relates to a sailing boat comprising a boat ' s underwater ship provided with a keel and at least one rudder .

Such a sailing boat is generally known in practice. The design of such a sailing boat is described, for example, in the book " Principles of Yacht Design" by Lars Larsson and Rolf Eliasson, published in 1994, ISBN 0- 7136-3855-9.

The known sailing boat is equipped with a keel at midship and one rudder or two rudders at the rear of the boat. The tasks of the keel and the rudder or the rudders are focused on keeping course and steering; one of these tasks is to limit the sideways drift of the sailing boat. As a rule the keel is provided with ballast, and preferably has a considerable draught in order to augment its effectiveness. The ballast is preferably located as far as possible away from the rump of the sailing boat, so that when the sailing boat leans over, a large torque is obtained to improve the boat's facility for lifting.

Providing the keel with a larger draught is problematic, among other things, because it means a considerable limitation with respect to the waters that are navigable. In addition, with the known boat special measures have to be taken if the water in which the boat is lying falls dry.

The object of the invention is to provide a solution to these disadvantages and problems. A further object of the invention is to design the sailing boat such as to improve the sailing boat ' s travelling resistance, its facility for lifting, and at the same time to improve the sail-handling ability so that higher speeds can be realized. To this end the sailing boat according to the invention is characterized in that, viewed in the boat's t t H H

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resistance experienced by the boat relatively low. This obviously has a positive effect on the maximum speed that can be reached with the boat .

Toeing-in of the two bilge rudders can be realized simply by positioning the two bilge rudders out of square in relation to the longitudinal axis of the boat. In addition, each bilge rudder may optionally be designed such as to have a predetermined asymmetrical profile. It is moreover possible to vary the toe-in over the height of the bilge rudders, so that the sailing characteristics of the boat can adapt to the sailing conditions, and in particular to the current sailing speed of the boat .

A favourable effect of the measures of the invention is further that they improve the course stability of the boat compared with that of a prior art sailing boat.

The invention will now be elucidated with reference to the drawings in which Figure 1 schematically shows the sailing boat according to the invention in a perspective view from below;

Figure 2 shows the sailing boat according to the invention in a schematic front view; and Figure 3 shows the sailing boat according to the invention in a schematic view from below.

Similar parts in the figures are indicated by identical reference numbers.

In the figures reference number 1 indicates the sailing boat according to the invention. Said sailing boat

1 comprises a boat's underwater ship 2, as shown in Figure

2 that lies under the waterline 3. Viewed in the boat ' s direction of sailing, a keel 4 is located at the front as can be most clearly seen in Figure 1. Behind the keel 4 just passed midship, the boat 1 is at both sides provided with a bilge rudder 5', 5'' (see especially Figures 1 and 2) . Each bilge rudder 5', 5' ' is mounted near the bilge 6 of the boat, that is to say at the (rounded) transition between flat and freeboard. Each bilge rudder 5', 5¹' comprises preferably a skeg (not shown) and a pivoting rudder blade . From the underwater ship 2 , the two bilge rudders 5', 5¹' are directed slightly inward, as is clearly shown in Figure 2. The two bilge rudders 5 ' , 5 I I are preferably toed-in, which means that the distance between the bilge rudders 5', 5*' at their front sides, i.e. the sides nearest the keel 4, is smaller than at their rear sides. This can be realized, for example, by positioning the two bilge rudders 5', 5'' out of square in relation to the longitudinal axis of the boat. As alternative or additional possibility, Figure 1 shows that both bilge rudders 5 ' , 5 ' ' preferably also have a predetermined asymmetrical shape. Diverse variants on the exemplary embodiment discussed above and shown in the figures are conceivable. For example, it is possible to vary the toe-in over the height of the bilge rudders .

Claims

1. A sailing boat (1) comprising a boat's underwater ship (2) provided with a keel and at least one rudder, characterized in that viewed in the boat's direction of sailing, the keel (4) is located at the front, and in that behind the keel, just passed midship, the boat (1) is at both sides provided with a bilge rudder (5' , 5' ' ) .

2. A sailing boat (1) according to claim 1, characterized in that each bilge rudder (5', 5'¹) is articulated, having a first fixed portion and a second portion, pivotingly coupled with the first portion.

3. A sailing boat (1) according to claim 2, characterized in that the first portion is embodied as skeg, and the second portion forms a rudder blade.

4. A sailing boat (1) according to one of the claims 1-3, characterized in that each bilge rudder (5¹, 5' ') is mounted on or near the bilge of the boat and is directed inward at a slight angle (Fig. 2), such that the lower ends are closer together than the top ends .

5. A sailing boat (1) according to one of the claims 1-4, characterized in that the two bilge rudders (5', 5¹¹) are designed to toe-in.

6. A sailing boat (1) according to one of the claims 1-5, characterized in that the two bilge rudders (5¹, 5'') rudders are positioned out of square in relation to the longitudinal axis of the boat.

7. A sailing boat (1) according to one of the claims 1-6, characterized in that each bilge rudder (5', 5'') has a predetermined asymmetrical profile.

8. A sailing boat (1) according to one of the claims 5-7, characterized in that the toe-in varies over the height of the bilge rudders (5', 5'').