EP1592612B1

EP1592612B1 - A sailing equipment and a method for swinging a boom

Info

Publication number: EP1592612B1
Application number: EP04709794A
Authority: EP
Inventors: Fredrik Grufman
Original assignee: Grufman Cecilia
Current assignee: Grufman Cecilia
Priority date: 2003-02-14
Filing date: 2004-02-10
Publication date: 2012-01-25
Anticipated expiration: 2024-02-10
Also published as: EP1592612A1; SE0300401L; SE0300401D0; SE524750C2; ATE542737T1; WO2004071866A1

Abstract

The invention relates to a sailing rig for a sailing boat (1) having a stem (5) and a stern (7). The sailing rig (9) comprises a mast (11) extending along a first axis, and a boom (13) having a first and a second end, and extending outwardly from the mast. The first end of the boom is in the vicinity of the mast and the boom is rotateable around the first axis. The sailing rig (9) further comprises a sheet (15), a first attachment member (17) arranged to attach the sheet in the boom, and a second attachment member (19) connected with the boat and arranged to hold the sheet in a position, the sheet, in an active state, being arranged to secure the position of the boom (13). The boom is rotateable at least one turn around the first axis. The sheet is positionable in said state, before and after rotation of the boom ahead of the mast, in which state the sheet is extendable straight between the attachment members. The invention also relates to a method for rotating a boom.

Description

TECHNICAL FIELD

The invention relates to a sailing rig for a sailing boat having a stem and a stern, the sailing rig comprising a mast extending along a first axis and a boom having a first end and a second end, and extending outwardly from the mast. The first end of the boom is in the vicinity of the mast, and the boom is rotateable around the first axis. The sailing rig further comprises a sheet, a first attachment member arranged to attach the sheet, and a second attachment member connectable with the boat and arranged to hold the sheet in a position, wherein the sheet in an active state is arranged to secure the position of the boom. The invention also relates to a method for rotating a boom of a sailing rig.

BACKGROUND OF THE INVENTION AND PRIOR ART

A sailing boat according to the prior art comprises a hull shaped with a stem and a stern, and a sailing rig comprising a mast and a boom rotateable around the mast. The mast and the boom are arranged to suspend a sail. During sailing it is an advantage if the sail is arranged substantially perpendicular relative a prevailing direction of the wind, at least during fair wind, wherein the sail in an optimal manner catches and transfers kinetic energy from the wind to the boat. In order to keep the sail in an optimal position relative the direction of the wind the sailing boat comprises a sheet comprising a rope or a line. The sheet is on one hand attached to the boom and on the other to the hull of the boat. The sheet thus prevents the boom from rotating around the mast and thus the boom and the sail can be maintained in a desired position relative the direction of the wind.
When the direction of the wind changes, because of a change of course, the sail must in some circumstances be rotated around the mast in order for the sail to once again be in an optimal position relative the direction of the wind. It then happens that the sail must be rotated from being directed towards one side of the boat into being directed towards the other side of the boat. Such a maneuver, in which the sail is rotated from the starboard side to the port side is named a gybe, if the wind comes from the stern. If the direction of the wind is, for example, coming substantially from the stern, the sail is first brought towards the stern by pulling the sheet, after which the wind is allowed to catch the sail and bring the sail to the other side of the boat. When the wind catches the sail it happens that the boom rotates very quickly and powerfully because of the sudden attack of force by the wind. There is then a risk that someone will be hit by the boom during this uncontrolled side change of the sail, wherein both personal and material damages may arise.

SUMMARY OF THE INVENTION

The purpose of the present invention is to indicate a sailing rig allowing rotating of the boom and thus the sail from one side to the other side of the boat with decreased risk for damages.
This purpose is achieved with the sailing rig as described in the introduction of the claim 1, which is characterised in that the mast and the boom are shaped such that the boom is rotatable at least substantially one turn around the first axis, and that the sailing rig is shaped such that a sheet is positionable in said active state, both before and after the rotation of the boom a head of the mast, in which state the sheet is extendable substantially straight between the first and the second attachment member.
With the sail and the boom being allowed to rotate ahead of the mast instead of astern of the mast during the side change for the sail the risk that the wind suddenly catches the sail and uncontrollably rotates the sail from one side to the other decreases. This, since the wind naturally rotates the sail towards the stem, when the wind comes from the stern, and thus it is easy to resist the force from the wind with the help of the sheet. Thus a greater control of the movement of the boom and the sail is obtained. Further, persons are more seldom being ahead of the mast than astern of the mast during sailing, decreasing the risk for someone to get hit by the boom.
With the sheet being positionable in the active state both before and after the rotation, in which state the sheet is extendable straight between the first and the second attachment member, the boom and the sail may be held in position even after the rotating of the sail ahead of the mast without the sheet getting stuck on or winded around the mast. This can for example be achieved by providing two sheets attached to the boom, the sheets passing on either side of the mast to the second attachment member. If the sheet is not positionable in said active state, it happens that the position of the boom cannot be secured in this new position wherein the sail cannot be positioned in the optimal position perpendicular relative to the direction of the wind. For example the sheet may get stuck on or winded around the mast when the boom rotates around the first axis.
According to one embodiment of the invention the sailing rig comprises a device allowing displacement of one of said attachment members at least substantially one turn around the first axis such that the sheet is positionable in said active state. Thus the sheet may be transported around the first axis such that the sheet does not get stuck or wound around the mast when the boom rotates ahead of the mast. Thus the sailing rig needs only one sheet, contributing to a simple construction.
Preferably the boom is rotateable at least two turns in the same direction around the first axis, and preferably the device allows displacement of one of said attachment members at least two turns in the same direction around the first axis. Preferably the boom is rotateable an unlimited number of turns around the first axis and preferably the device allows displacement of said attachment member an unlimited number of turns around the first axis. Thus the sail can be rotated ahead of the mast several times in the same direction without the sail having to be brought back the same way after an earlier rotation in order to make a following rotation in the same direction possible. Thus the boom can be rotated ahead of the mast an uncountable number of times consecutively, giving increased flexibility and the possibility to perform several different types of maneuvers than before. The rotation of the boom and the displacement of the attachment member can thus be performed independently from previous rotations and displacements.
According to a further embodiment of the invention the device comprises an elongate element extending around the first axis, holding the displaceable attachment member, and allowing displacement of the displaceable attachment member around the first axis. Such an elongate element facilitates the displacement of the attachment member. Further, a person does not need to move with and bring the attachment member around the first axis. The device is thus easier to use.
According to a further embodiment of the invention said elongate element comprises an elongate flexible element connected with said displaceable attachment member and being arranged to drive the displacement of the attachment member.. Such an elongate flexible element can for example be a line or a chain. By displacing the elongate flexible element the attachment member is also displaced. Thus a person may displace the attachment member at a distance from the attachment member.
According to a further embodiment of the invention said elongate element comprises a railing arranged to extend substantially one turn around the first axis, wherein the displaceable attachment member is arranged to run along the railing. Such a railing leads and directs the attachment member around the first axis that facilitates the displacement of the attachment member.
According to a further embodiment of the invention said railing is arranged to extend in a closed path around the mast. Thus the device allows the displacement member to be displaced an unlimited number of turns around the first axis, and the displacement of the attachment member may take place independently from previous displacements of the attachment member.
According to a further embodiment of the invention the displaceable attachment member comprises a running element arranged to run in said railing. Such a running element gives lower friction, and thus the attachment member may be displaced with less energy consumption. Further the displacement may be carried out faster, and the displacement member and the device become more durable. Preferably the running element is provided with a wheel or some other friction-decreasing member. Further the running element can easily be blocked in a desired position in the railing, for example when the running element holds the sheet in said active state.
According to a further preferred embodiment of the invention said elongate flexible element is connected with the running element for displacement of the running element along the railing. Thus the flexible element transfers force and kinetic energy to the running element for displacement of the running element, and thus the attachment member, along the railing and around the first axis.
According to a further embodiment of the invention the device comprises a driving implement arranged to drive the elongate flexible element. Thus the displacement of the attachment member may take place automatically. The driving implement can for example comprise a crank making shifting of the force possible when a person cranks the crank and displaces the attachment member, or a motor allowing the displacement of the attachment member to take place automatically.
According to a further embodiment of the invention the device is arranged to displace the first attachment member relative the boom and around the first axis. Thus according to this embodiment, it is the attachment member attaching the sheet in the boom that is displaced. The attachment member is thus displaced inwardly along the boom toward the mast, around the backside of the mast, and thereafter once again outwardly on the boom, on the other side of the boom.
According to a further embodiment of the invention said railing is connected with and runs along the boom. The railing directs the attachment member along the boom and links the attachment member to the mast for displacement of the attachment member around the mast. Preferably the railing is also arranged around the mast or the device comprises a further railing in connection with the mast.
According to a further embodiment of the invention said device is arranged to displace the second attachment member around the first axis. Thus in this embodiment the attachment member holding the sheet in a position at the deck or in the hull of the boat is displaced around the first axis.
According to a further embodiment of the invention said railing is arranged to extend around the first axis in connection to the deck of the boat. Thus the railing directs the second attachment member around the mast and around the first axis along the deck of the boat.
According to a further embodiment of the invention the device comprises three separate holding points for holding the elongate flexible element. Thus it is easy to displace the attachment member at the same time as the control of the elongate flexible element is maintained, since the elongate flexible element may be attached in one of said holding points during the entire translation of the attachment member.
The purpose of the invention is also to indicate a method allowing rotation of the boom with decreased risk for damages.
This purpose if achieved with the method according to the introduction of claim 16, which is characterised in that the method comprises

rotating the boom, which is rotatable at least one turn around the first axis ahead of the mast from one side to the other side of the boat, ahead of the mast,
positioning of the sheet in said active state,
extending the sheet between the first and the second attachment members.

With such a method the same advantages are obtained as for the sailing rig described previously. Further the method may comprise steps corresponding to the features described in connection with the sailing rig.
According to one embodiment of the method the sailing rig comprises three holding points arranged at a distance from each other for holding the elongate flexible element, wherein the method comprises

holding the elongate flexible element in a first and a second of said holding points,
loosening the elongate flexible element from one of the two holding points,
driving the displacement of the second attachment member with the elongate element,
attaching the elongate flexible element in the third of said holding points.

Thus it is easy to displace the attachment member at the same time as the control of the elongate flexible element is maintained. This since the elongate flexible element is attached in at least one holding point during the entire displacement of the attachment member.
According to a further embodiment of the method according to the invention said attachment member is displaced when the boom is positioned substantially in parallel with a prevailing direction of the wind. Thus the risk for random forces from the wind, affecting the sail and the boom, and thus the attachment member during the displacement is decreased. Thus the forces on the attachment member during the displacement is decreased also, wherein the risk for damages on the attachment member is decreased.

BRIEF DESCRIPTION OF THE ATTACHED DRAWINGS

The invention is now to be described in greater detail and with reference to the attached drawings, in which

Fig. 1: shows an embodiment of a sailing rig according to the invention in which the second attachment member is displaced around the first axis.
Fig. 2: shows a second embodiment of a sailing rig according to the invention in which the second attachment member is displaced around the first axis.
Fig. 3: shows a third embodiment of a sailing rig according to the invention in which the first attachment member is displaced around the first axis.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Figure 1 shows a sailing boat 1 comprising a hull 3 shaped with a stem 5 and a stern 7. The sailing boat further comprises a sailing rig 9 comprising a mast 11 and a boom 13. The mast 11 is connected with the hull 3 and is standing vertically in the boat such that the mast 11 extends along a first axis. The boom 13 has a first and a second end, and extends outwardly from the mast 11, wherein the first end of the boom 13 is in vicinity of the mast 11. The mast 11 and the boom 13 are adapted to cooperatively suspend a sail. Further the boom 13 is rotateable around the first axis. In this example the boom 13 is rotateable an unlimited number of turns in the same direction around the first axis.
When the wind is blowing the wind causes a momentum on the sail, the momentum acting for rotating the boom and the sail around the first axis towards a position in which the boom and the sail' are parallel with the direction of the wind. In order to secure the desired position of the sail and the boom 13 the sailing rig 9 comprises a sheet 15, a first attachment member 17 arranged to attach the sheet 15 in the boom 13 and a second attachment member 19 being connected with the boat 1 and arranged to hold the sheet 15 in a position. The second attachment member 19 comprises a block for shifting the force, through which the sheet 15 runs. Thus the length of the sheet 15 between the first 17 and the second attachment member 19 is adjusted by hauling in and hauling out the sheet 15 in the block. Further the block allows the sheet 15 to be adjusted with a greater force because of the shifting of the force.
The sheet 15 is arranged to, in an active state, secure the position of the boom 13 by counteracting the moment and thus prevent rotating of the boom 13. In the active state, the sheet 15 is extended substantially straight between the first 17 and the second attachment members 19. During fair wind the sail is usually arranged substantially perpendicular relative the direction of the wind in the desired position to obtain the optimal transfer of kinetic energy from the wind to the boat for driving the boat.
The sailing boat 1 further comprises a device 21 for allowing displacement of the second attachment member 19 around the first axis. By displacing the second attachment member around the mast the boom 13 and thus the sail can be allowed to rotate ahead of the mast without the sheet 15 getting stuck on the mast. The device 21 comprises for this purpose an elongate element 23, which, in the first embodiment, is flexible and for example may comprise a line or a rope. The elongate flexible element 23 is connected with the second attachment member 19 and is arranged substantially freely around the mast 11. During displacement of the second attachment member 19 the elongate flexible element 23 is hauled around the mast 11 and the first axis, wherein the elongate flexible element 23 drives the displacement of the attachment member 19 around the first axis.
The sailing boat 1 further comprises a sheet railing 25 arranged on the deck of the sailing boat 1 and an attachment element 27 being attached with the sheet railing 25 and arranged to run along the sheet railing 25. The attachment element 27 comprises three notches 29 arranged to function as holding points for the elongate flexible element 23. The elongate flexible element 23 can thus be held and fixed in the attachment element 27 in the holding points 29.
In the following the use of the sailing rig according to the method of the invention is to be described. Initially, when the direction of the wind is straight from the stern, the boom 13 and the sail are arranged in a perpendicular position relative the direction of the wind, the boom 13 holding the sail in an optimal position for catching kinetic energy from the wind. In this example the boom 13 is initially directed perpendicular towards the starboard, and thus the boom 13 is also perpendicular relative the length of the boat.
At a change of the direction of the wind the sail is no longer perpendicular relative the direction of the wind, and an optimal transfer of kinetic energy from the wind to the boat cannot take place. In order for the sail to once again occupy an optimal position the boom 13 and the sail must be rotated. In this example the direction of the wind is changed as indicated in figure 1 from being substantially straight from the stern to being obliquely from the stern from the starboard side. In order for the sail to be in an optimal position the sail and the boom 13 must be rotated to the position obliquely towards the stern and towards the port side as indicted by the dotted boom in fig. 1.
In the initial phase of the method the elongate flexible element 23 is attached in a first of said holding points 29. Further the elongate flexible element 23 is connected with the second attachment member 19, and thus the sheet 15 is also maintained in position with the help of the elongate flexible element 23. When rotationg the boom 13 the elongate flexible element 23 is firstly also attached to a second of said holding points 29. Thus the elongate flexible element 23 is attached in two of said holding points 29. Afterwards, the sheet 15 is hauled out such that the sheet 15 no longer prevents the boom from rotating. The sheet 15 is however still hold by the second attachment member 19.
Because of the moment caused by the wind the boom 13 rotates ahead of the mast to a position in which the boom 13, and thus the sail, is parallel with the direction of the wind. The boom 13, and the sail is then said to be positioned in the eye of the wind and is in this position substantially free from further influences from the wind. When the sail is in this position the elongate flexible element 23 is loosened from the first holding point 29. By pulling the elongate flexible element 23 the second attachment member 19 is driven to be displaced around the first axis and the mast 11. The second attachment member 19 is displaced ahead of the mast toward the port side of the mast and back towards the attachment element 27 and the sheet railing 25. During the entire displacement of the second attachment member 19 the control of the elongate element 23 is maintained, since it is still attached to the second of said holding points 29. Afterwards the elongate flexible element 23 is attached in a third of said holding points 29 such that the second attachment member 19 ends up close to the attachment element 27 and the sheet railing 25.
The sheet 15 is then positioned in said active state by the sheet 15 being hauled in, and, during the hauling, the sheet 15 also rotates the boom 13 the remaining part of the distance from the eye of the wind to the optimal position in which the sail is perpendicular relative to the direction of the wind. The sheet 15 is thus extended substantially straight between the first 17 and the second attachment member 19 and counteracts said moment as described previously. Alternatively the boat is turned up against the wind for a very brief period, directly followed by a hauling in of the sheet 15 and returning of the boat, the force from the wind moving the sail to the desired position. Thereafter the elongate flexible element 23 is loosened from the second of said holding points 29. Thus, a manoeuvre, a so-called gybe, have been carried out, during which the sail has been rotated ahead of the mast instead of astern of the mast as of the prior art.
In fig. 2 a further example of a sailing boat 30 having a stem 32 and a stern 34 and comprising a sailing rig 36 according to one embodiment of the invention is shown. The sailing rig comprises a mast 38 extending along a first axis and a boom 40 being rotateable around the first axis in the same way as the boom as described in connection with fig. 1. Further, the mast 38 and the boom 40 are arranged to be able to suspend a sail. The sailing rig 36 further comprises a sheet 42, which is arranged to, in an active state, secure the position of the boom 40. Further the sailing rig comprises a first attachment member arranged to attach the sheet 42 to the boom 40, and a second attachment member 46 arranged to hold the sheet 42 in a position. Further, the sheet 42 is positionable in said active state both before and after rotation of the boom 40 ahead of the mast 38. Further the sheet is extendable substantially straight between the first 44 and the second attachment member 46 in the active state.
In this example the sheet 42 is positionable in the active state by the sailing rig 36 comprising a device 48 allowing displacement of the second attachment member 46 around the first axis. Thus the sheet 42 does not risk to get stuck on the mast during rotating of the boom 40 ahead of the mast. Further the boom is rotateable an unlimited number of turns in the same direction around the first axis, and the device allows displacement of the second attachment member 46 an unlimited number of turns in the same direction around the first axis.
The device 48 comprises an elongate element 50 extending around the first axis. The elongate element 50 holds the second attachment member 46 and allows displacement of the second attachment member 46 around the first axis. The elongate element 50 comprises in this example a railing 52, the second attachment member 46 being arranged to run along the railing 52. The attachment member 46 thus comprises a running element 54 arranged to run in the railing 52. The running element comprises a number of wheels and is shaped to run along the railing 52 with a small frictional force.
The running element 54 is further arranged to hold the sheet 42. Further the railing 52 is arranged to extend in a closed path around the mast 38. Thus the running element 54 may be displaced an unlimited number of turns around the first axis in the same direction. The elongate element 50 further comprises an elongate flexible element arranged to drive the displacement of the attachment member 46 and the running element 54. The elongate flexible element is arranged inside the railing 52 and is therefore not shown in the figure. The elongate flexible element is connected with the running element 54. In this example the elongate flexible element is constituted by a chain inside the railing 52. The device 48 further comprises a driving implement 60 arranged to drive the elongate flexible element. The driving implement 60 thus displaces the elongate flexible element inside the railing 52, wherein the elongate flexible element also displacing the running element 54 along the railing 52 and thus displaces the second attachment member 46. The driving implement 60 is in this example activated by pushing buttons. The sailing boat 30 also comprises control equipment for controlling the driving implement 60, and the displacement of the second attachment member 46.
The sailing boat 30 further comprises a sheet railing 62 arranged to allow displacement of the second attachment member 46 a shorter distance perpendicular relative the length of the boat 30, such that the second attachment member 46 may hold the sheet 42 in different positions on the boat 30. In this example the sheet railing 62 is connected with the railing 52. During displacement of the second attachment member 46 the running element 54 is thus carried from the sheet railing 62 to the railing 52. The sailing boat further comprises two stop members 64 arranged on each side of the sheet railing 62 for obstructing the running element 54 from passing from the sheet railing 62 to the railing 52 when the sheet 42 is used in the active state of the sheet 42. During displacement of the second attachment member 46 around the first axis the stop members 64 are displaced such that the stop members 64 no longer obstructs the movement of the running element 54 from the sheet railing 62 to the railing 52.
In the following, a rotation of the boom 40 ahead of the mast according to the invention is to be described. When the direction of the wind changes the sheet 42 is partly loosened from the second attachment member 46, after which the sheet 42 is hauled out such that the boom 40 rotates and end up in the eye of the wind as described previously. The stop members 64 are displaced such that the running element 54 is allowed to pass from the sheet railing 62 to the railing 52. The driving implement 60 is activated which conveys a force to the elongate flexible element, the elongate flexible element displacing the running element 54 along the sheet railing 62 and the railing 52. The running element 54 is displaced around the first axis, ahead of the mast 38 to the other side of the boat 30 and is thereafter once again transported into the sheet railing 62. The stop member 64 are once again shut, preventing a displacement of the running element 54 from the sheet railing 62 to the railing 52. Thereafter, the sheet 42 is hauled in, bringing the boom to the desired position. The second attachment member 46 is once again induced to hold the sheet 42 stationary and steady such that the sheet in its active state secures the position of the boom 40.
In fig. 3 a further example of a sailing boat 70 having a stem 72 and a stern 74, and comprising a sailing rig 76 according to an embodiment of the invention is shown. The sailing rig 76 comprises a mast 78 extending along a first axis, and a boom 80 being rotateable around a first axis in the same way as the boom described in connection with fig.1. Further the mast 78 and the boom 80 are arranged to be able to suspend a sail. The sailing rig 76 further comprises a sheet 82, which, in an active state, is arranged to secure the position of the boom 80. Further, the sailing rig 76 comprises a first attachment member 84 arranged to attach the sheet 82 to the boom 80 and a second attachment member 86 arranged to hold the sheet 82 in a position. Further, the sheet 82 is positionable in said active state both before and after the rotation of the boom 80 ahead of the mast 78. Further the sheet 82 is extendable substantially straight between the first 84 and the second attachment member 86 in the active state. In this example the sheet 82 is further positionable in the active state by the sailing rig 76 comprising a device 88 allowing displacement of the first attachment member 86 around the first axis.
The device 88 comprises an elongate element 90 extending around the first axis, holding the first attachment member 84 and allowing displacement of the first attachment member 84 around the first axis. The elongate element 90 comprises a railing 92 arranged on and connected with the boom 80. The device further comprises a mast railing 94 connected with and around the mast 78. In another example the railing 92 on the boom can instead be arranged to continue behind the boom and around the mast 78. The first attachment member 84 also comprises a running element 96 in which one end of the sheet 82 is attached. The running element 96 is arranged to run in the railing 92 and in the mast railing 94. The railing 92 and the mast railing 94 are thus adapted to each other such that the running element 96 may pass between the railing 92 and the mast railing 94.
The elongate member 90 also comprises an elongate flexible element arranged inside the railing 92 and being connected with the running element 96 for displacement of the running element 96 along the railing 92. The device 88 further comprises a driving implement arranged to drive the displacement of the elongate flexible element and thus the running element 96. The driving implement is in this example arranged inside the mast 78 and is therefore not shown in the figure 3, but the driving implement can also be arranged in connection with the boom 80 or on the outside of the mast 78 or on some other suitable location.
When rotating the boot 80 ahead of the mast 78, the sheet 82 is loosened in the second attachment member 86, the sheet 82 being hauled out such that the boom 80 is allowed to rotate. When the boom has rotated to the eye of the wind, in which the boom is parallel to a prevailing direction of the wind, the device 88 is activated. The first attachment member 84 is displaced by the driving implement displacing the elongate flexible element within the railing, which in turn displaces the running element 96 towards the stern along the rail 92, and towards the mat railing 94. The running element passes to the mast railing 94 after which the running element is transported to the other side of the mast 78, after which the running element once again passes to the railing 92, now on the other side of the boom 80. Thus, the sheet 82 does not get stuck on the mast 78, even though the boom 80 is rotated ahead of the mast 78, after which the sheet 80 is hauled in and the boom 80 is rotated to the desired position. Thereafter, the second attachment member 86 is allowed to once again hold the sheet 82, and thus the boom 80, in a fixed position.
The second attachment member 86 is, as in the previously described embodiments, connected with a sheet railing 98 connected with the sailing boat 70 to allow a change of the position in which the attachment member 86 holds the sheet 82.
The embodiments described hereby are only to be seen as examples of the invention, which can be varied freely within a framework of the following claims. For example the three examples shown above can be freely combined with each other or with other prior art. The method and the sailing rig can also be adapted for sailing boats in which the sheet in its active state normally is positioned ahead of the mast, wherein the invention instead can be used for rotating the boom astern of the mast. The method can also be carried out for other directions of the wind than fair wind.

Claims

A sailing rig (9, 36, 76) for a sailing boat (1, 30, 70) having a stem (5, 32, 72) and a stern (7, 34, 74), the sailing rig (9, 36, 76) comprising a mast (11, 38, 78) extending along a first axis and a boom (13, 40, 80) having a first and a second end and extending outwardly from the mast (11, 38, 78), the first end of the boom (13, 40, 80) being in the vicinity of the mast (11, 38, 78) and the boom (13, 40, 80) being rotatable around the first axis, the sailing rig (9, 36, 76) further comprising a sheet (15, 42, 82), a first attachment member (17, 44, 84) arranged to attach the sheet to the boom (13, 40, 80), and a second attachment member (19, 46, 86) connectable with the boat and arranged to hold the sheet (15, 42, 82) in a position, the sheet (15, 42, 82), in an active state, being arranged to secure the position of the boom (13, 40, 80), characterised in that the mast and the boom (13, 40, 80) are shaped such that the boom (13, 40, 80) is rotatable at least one turn around the first axis and that the sailing rig (9, 36, 76) is shaped such that the sheet (15, 42, 82) is positionable in said active state before and after the turning of the boom (13, 40, 80) ahead of the mast (11, 38, 78), in which state the sheet (15, 42, 82) is extendable substantially straight between the first (17, 44, 84) and the second attachment member (19, 46, 86).
A sailing rig according to claim 1, characterised in that the sailing rig (9, 36, 76) comprises a device (21, 48, 88) allowing displacement of one of said attachment members (19, 46, 84) at least substantially one turn around the first axis such that the sheet (15, 42, 82) is positionable in said active state.
A sailing rig according to claim 2, characterised in that the boom (13, 40, 80) is rotatable at least two turns in the same direction around the first axis, the device allowing displacement of one of said attachment members (19, 46, 84) at least two turns in the same direction around the first axis.
A sailing rig according to claim 2 or 3, characterised in that the device (21, 48, 88) comprises an elongate element (23, 50, 90) extending around the first axis, holding the displaceable attachment member (19, 46, 84) and allowing displacement of the displaceable attachment member (19, 46, 84) around the first axis.
A sailing rig according to claim 4, characterised in that said elongate element (23, 50, 90) comprises an elongate flexible element (23) connected with said displaceable attachment member (19, 46, 84) and arranged to drive the displacement of the attachment member (19, 46, 84).
A sailing rig according to claim 4 or 5, characterised in that said elongate element (50, 90) comprises a railing (52, 92) arranged to extend substantially one turn around the first axis, wherein the displaceable attachment member (46, 84) being arranged to run along the railing (52, 92).
A sailing rig according to claim 6, characterised in that said railing (52, 92) is arranged to extend in a closed path around the first axis.
A sailing rig according to claim 6 or 7, characterised in that the displaceable attachment member (46, 84) comprises a running element (54, 96) arranged to run in said railing (52, 92).
A sailing rig according to claim 5 and claim 8, characterised in that said elongate flexible element is connected with the running element (54, 96) for displacement of the running element (54, 96) along the railing (52, 92).
A sailing rig according to claim 5 and any of the claims 6-9, characterised in that the device (48) comprises a driving implement (60) arranged to drive the elongate flexible element.
A sailing rig according to any of the claims 2-10, characterised in that the device (88) is arranged to displace the first attachment member (84) in relation to the boom (80) and around the first axis.
A sailing rig according to claim 11 and any of the claims 6-10, characterised in that said railing (92) is attached with and runs along the boom (80).
A sailing rig according to any of the claims 2-12, characterised in that the device (21, 48) is arranged to displace the second attachment member (19, 46) around the first axis.
A sailing rig according to claim 13, characterised in that said railing (52) is arranged to extend around the first axis in connection with the deck of the boat.
A sailing rig according to claim 13 or 14, characterised in that the device (21) comprises three separate holding points (29) for holding the elongate flexible element (23).
A method for rotating a boom (13, 40, 80) of a sailing rig (9, 36, 76) on a sailing boat (1, 30, 70) having a stem (5, 32, 72) and a stern (7, 34, 74), the sailing rig (9, 36, 76) comprising a mast (11, 38, 78) extending along a first axis and a boom (13, 40, 80) having a first end and a second end and extending outwardly from the mast (11, 38, 78), the first end of the boom (13, 40, 80) being in the vicinity of the mast (11, 38, 78) and the boom (13, 40, 80) being rotatable around the first axis, the sailing rig (9, 36, 76) further comprising a sheet (15, 42, 82), a first attachment member (17, 44, 84) arranged to attach the sheet to the boom (13, 40, 80) and a second attachment member (19, 46, 86) connectable with the boat and arranged to hold the sheet (15, 42, 82) in a position, the sheet (15, 42, 82), in an active state, being arranged to secure the position of the boom (13, 40, 80), characterised in that the method comprises
- rotating the boom (13, 40, 80), which is rotatable at least one turn around the first axis ahead of the mast (11, 38, 78) from one side to the other side of the boat, ahead of the mast,

- positioning the sheet (15, 42, 82) in said active state,

- extending the sheet (15, 42, 82) in the active state such that it extends substantially straight between the first (17, 44, 84) and the second attachment member (19, 46, 86).
A method according to claim 16, characterised in that the method comprises
- displacing one of said attachment members (19, 46, 84) at least substantially one turn around the first axis in such a way that the sheet (15, 42, 82) is positioned in said active state.
A method according to claim 17, characterised in that the sailing rig comprises an elongate flexible element (23) extending around the first axis and being connected with said displaceable attachment member (19, 46, 84), the method comprising
- driving the displacement of the displaceable attachment member (19, 46, 84) with the elongate flexible element (23).
A method according to claim 17 or 18, characterised in that the sailing rig (36, 76) comprises a railing (52, 92) arranged to extend substantially one turn around the mast, the method comprising
- displacing the displaceable attachment member (46, 84) along the railing (52, 92).
A method according to any of the claims 17-19, characterised in that the method comprises
- displacing the first attachment member (84) in relation to the boom (80), and around the first axis.
A method according to any of the claims 17-20, characterised in that the method comprises
- displacing the second attachment member (19, 46) around the first axis.
A method according to claim 18 and 21, characterised in that the sailing rig (9) comprises three holding points (29) arranged at a distance from each other for holding the elongate flexible element (23), the method comprising
- holding the elongate flexible element (23) in a first and a second of said holding points (29),

- loosening the elongate flexible element (23) from one of the two attachment points (29),

- driving the displacement of the second attachment member (19) with the elongate element (23),

- attaching the elongate flexible element (23) in the third of said holding points (29).
A method according to any of the claims 17-22, characterised in that said displaceable attachment member (19, 46, 84) is displaced when the boom (13, 40, 80) is positioned substantially in parallel with a prevailing direction of the wind.