SAIL BOARD ARRANGEMENT

Abstract: A sail board arrangement, wherein the sails of the sail board include a first (12) and a second (14) sail section with an intermediate air gap. Said sail sections are stretched between an associated mast (11) and an associated boom arrangement (16) with a pocket formation in each of the sail sections. Said first (front) sail section (12) with its leading edge is connected direct to the mast (11), whereas said second (rear) sail section (14) with its leading edge is connected to the mast through a bracing means (13) which in its turn is connected to the mast. The rear edge of said first sail section (12) is movable from side to side within the boom arrangement in front of and beyond the leading edge of the second sail section to adjust the air gap from side to side in relation to said second sail section. Thus, an air stream may be guided from said first sail section through said air gap transversely backwards and outwards along the leeward side of said second sail section.

Description: Sail Board Arrangement. The present invention relates to a sail board arrangement, the sail of the board comprises a first and a second sail section with an air gap therebetween, and the sail sections are individually stretched between an associated mast and an associated boom with a pocket formation in each sail section. An arrangement of the above stated art is known from Norwegian patent application 83 3673. It is shown a sail board arrangement, wherein the sail of the board comprises two sections. A first section is in form of a fore sail and a second section is in form of a storm sail. Each of said sail sections is secured by its leading edge to its associated mast.. By means of a s.tretching device each sail section is secured at its opposite edge to one end of its boom, whereas the opposite end thereof is secured to its associated mast. An active mast is being secured directly to the board by means of a flexible fastening member at the lower end of the mast, whereas an inactive mast or a similar bracing member is secured directly to the active mast. An arrangement of two sail sections (fore sail and storm sail) is illustrated therein, each of which may be secured to a separate mast extending next to each other, whereas one of the masts (to which the fore sail is secured) provides the active mast, and the other mast (to which the storm sail is secured) provides an inactive mast or auxilliary mast. With the expression "active mast" is herein being meant the mast that is connected directly to the sail board by means of an associated fastening member, and with the expression "inactive mast" is being meant the mast that is fastened directly to the activemast without further connection with the sail board. One of the sail sections (the storm sail) of prior art is adjustable in different angular positions in relation to the other sail section (the fore sail) by swinging said one sail section about its associated mast. By using two different masts, i.e. one mast for each sail section, there is allowed a restricted amount of air to pass through the gap between the masts. It is required that a relatively large amount of air is allowed to pass past the storm sail, i.e. in the gap between the masts and by preference in such a way that the propulsion power can be utilised in a most favourable manner. In DE OS 31 21 402 Al is shown a sail board with two sail sections secured to a common mast. The fore sail is secured with one of its edges to the mast and with the opposite edge secured by means of a stretching arrangement to the outer end of a boom that is a common boom for said two sail sections. The storm sail is secured at the upper and lower end of the mast and by means of one of its edges it is adapted to be stretched in a certain degree such that a gap is provided along the mast. Along opposite sides said storm sail is stretched from the top of the mast to the outer end of the boom and from the outer end of the boom to th'e lower portion of the mast. By means of said twς> sail sections a front pocket formation is provided in the storm sail and a rear pocket formation is provided in the fore sail to allow air to pass in a restricted air stream through said gap between the mast and the storm sail and accordingly, in a favourable manner between the sail sections. Thus, a favourable propulsion effect is obtained in a similar way as by sailing a sail boat provided with fore sail and storm sail. A disadvantage of the embodiment of prior art according to said DE OS 31 21 402 Al is, that the storm sail is not sufficiently controllable and among other things has a tendency to flutter upon turning of the sail board. Accordingly, during sailing possible adjustment of the storm-sail is minimized. Another disadvantage consists in the difficulties in turning the sail board provided with such unregulatable amount of sails and such rigid and unflexible sail structure as shown in the prior art embodiment. In said prior art embodiment it is difficult or even impossible for the user of the sail board during movement of the board to pass in front of the mast. The aim of the present invention is to provide a solution, wherein pocket formations are obtained in a controlled manner in both sail sections and simultaneously to allow a restricted air stream to pass in controlled and regulatable manner between the sail sections. Also, there is sought to provide a solution, wherein the user is allowed to pass in front of the mast during turning of the board. The arrangement of the present invention is characterised in that said first (front) sail section with its forward edge is connected direct to the mast whereas said second (rear) sail section with its front edge is connected to the mast by means of a bracing member, which in its turn is connected to the mast or said first sail section at the upper or lower end of same, and that the rear side edge of said first sail section is movable from side to side in said boom arrangement in front of and sideways past the leading edge of said second sail section in order to adjust said air gap from side to side in relation to " said second sail section in order to guide an air stream from said first sail section through said air gap obliquely rearwards and outwards along the leeward side of said second sail section. According to a first embodiment of the invention the arrangement is characterised in that said first sail section is turnable about its leading edge within a first boom, whereas said second sail section is turnable about its leading edge within a second boom and said second boom is adjustable and fixable in certain angular positions in relation to said first boom about an axis extending rectangularly to the maine plane of the boom. By means of the above stated embodiment it is possible to adjust said two sail sections separately within its boom and in addition to adjust the booms in a mutually controlled manner, such that one of the sail sections is adjustable to different positions in relation to said second sail section. As may be required adjustment is made possible by swinging and/or moving one of said booms in relation to the other boom. According to the present invention there is further sought a solution, wherein mainly the same effect is obtained as obtained by the amount of sails of the above solution, but with the additional effect that said structure has less weight and simultaneously has more flexibility between the sail sections. In this respect the arrangement is characterised in that a boom, which is a common boom for said sail sections, is provided with a bracing portion extending transversely of the boom in the central portion thereof, and by preference closer to the front end than to the rear end of the boom, whereas the rear edge of said first sail section is slidably engaged with one of the side edges of the bracing portion, and the leading edge of said second sail section is secured to or slidably connected to the other side edge of said bracing portion. According to the present invention, by using a common boom for said sail sections, it is in general terms achieved a simple boom structure and a simple rigging of the sail sections, simultaneously as one may omit said second mast, which is required in other respects, or said second mast is in all events allowed to have a simple, especially flexible and easily mountable structure. By means of said bracing portion extending transversely of the boom, it is possible in a simple manner to secure an efficient fastening of the sliding means at the rear edge of said first sail section, and simultaneously secure an efficient fastening of the leading edge of said second sail section, and accordingly, provide a controllable air gap between the sail sections, in all events in the neighbourhood of the boom. Further features of the invention will be evident from the following description having regard to the accompagnying drawings in which: Figs. 1 and 2 show a sail arrangement of the invention in side elevation and show alternative ways of fastening the sail arrangement in the sail board. Fig. 3 is a horisontal sectional view of the sail arrangement according to Figs. 1 and 2. & Figs. 4 and 5 show a detail of means for fastening the masts in certain mutual angular positions, illustrated in a side elevation respectively in a horisontal sectional view. Fig. 6 shows the arrangement of the invention in a second embodiment thereof, illustrated in a side elevation. Fig. 7 shows a horisontal sectional view of the arrangement of Fig. 6. Figs. 8 and 9 show a first and second section of the arrangement of Figs. 6 and 7 to a greater scale. Fig. 10 shows a side elevation of the arrangement of the invention according to a third embodiment thereof. Fig. 11 is a horisontal sectional view of the arrangement of Fig. 10. Fig. 12 is a vertical sectional view of the arrangement of Fig. 11. Fig. 13 shows an alternative embodiment of a detail of fig. 11. In Figs. 1 and 2 there are shown a sailing board 10 to which one and the same amount of sails is mounted on a sail board in two different ways. In Fig. 1 is shown an amount of sails, wherein a first mast -11 to support a first sail section is being used as an active mast and herein stated as a storm sail 12, whereas a second mast 13 to support a second sail section is being used as inactive mast or auxilliary mast and herein is stated as a fore sail. According to Fig. 2 said second mast 13 is being used as active mast, whereas said first mast 11 is being used as inactive mast or auxialliary mast. The masts 11 and 13 are in the illustrated embodiment similarly shaped and may at their lower end, in conventional manner, be provided with a flexible fastening member 15 to be inserted in and secured in a fixing hole in the sailing board, approximately at the central portion of said board. Said fastening member is allowed to be fastened to the sail board and to the mast and to be demounted therefrom, as may be required, in a simple manner, and accordingly, it is similarly simple to rearrange the amount of sails from the position illustrated in Fig. 1 to that of Fig. 2, and vice versa. The sail sections 12 and 14 are in conventional manner at a first side edge provided with its own amount of sails 12a and 14a, respectively, and is treaded from above in downward direction to be located on its respective mast 11 and 13. Said sail sections 12 and 14 are arranged with a certain degree of movability within its bow shaped boom 16 respectively 17 (see Fig. 3). Said boom is being fastened approximately in elbow hight of the actual user, i.e. with a certain adjustment possible in relation to the associated mast and all according to the elbow hight of the user. In the embodiment illustrated in detail in Figs. 4 and 5 is ullustrated a sleeve member 19 being mounted on the mast 13 between an upper and a lower annular stop member 20,21. The upper stop member 20 is to be secured by means of a locking pin 22 in a through hole 23, whereas the lower stop member 21, in corresponding manner is to be secured by a locking pin 24 in a through hole 25. An upper row of through holes 23 and a lower row of through holes 25 is arranged to receive said locking pins 22 and 24 in different levels for aadjustment of the stop members 20 and 21 and, thereby, the sleeve member in different levels of the mast 13. Instead of employing the illustrated locking mechanism between the sleeve member 19 and its holding member 29, different other types of locking mechanisms can be employed for locking the booms 16,17 in specific positions in mutual relations. Said sleeve member may as an example support holding members 27,29 for the booms 16,17 mutually supported and may be provided with cooperating gear rims or sets of teeth engaging each other axially in different angular positions of the holding members, whereas the holding members are allowed to be lifted out of mutual engagement by means of control means, not further illustrated. Said gear rims or sets of teeth are in their active positions arranged to be pushed into engagement by means of the weight of the boom and/or by means of a pressure spring or tension spring between said holding members. It is thus possible to allow swinging of the booms 16 and 17 in mutual relation about the sleeve member 19 on the mast 13 and to lock same in mutual relation in certain positions and possibly also in relation to the mast. Alternatively, only one of the booms (the boom 16) is pivotable in relation to the mast, whereas the other boom (the boom 17) is allowed to be locked to the mast in a specific locked position thereon. In the illustrated embodiment there is shown a solution, wherein the locking mechanism is illustrated only on one of the booms (the boom 17), but, alternatively, there may also be provided a stop mechanisme to be released by the other boom (the boom 16) or by both booms, as may be required. As illustrated in Fig. 3 said boom 17 is being shaped in conventional manner, whereas the boom 16 is being shaped in a specific manner by fastening same to said two separate masts 11 and 13, such that the boom 16 may form a rigid connecting member between the masts 11, 13 in elbow height of the user. T * he boom 16 is illustrated with a triangular shape, i.e. with three bow portions 16a,16b,16c forming a rigid unit. The holding member 27 is secured centrally of one bow portion 16a, whereas the opposite holding member, located at the opposite end of the boom 16, i.e. at the butting end portion between the two other bow members 16b and 16σ, is secured to the mast 11. The holding member 35 may, alternatively, be secured to the sleeve member (not further shown) on the mast 11 in approximately the same manner as the holding member 27 is secured to the mast 13 by means of the sleeve member 19. Said holding member 35 may further be secured to the mast in a specific position thereon, by means of a stop mechanisme corresponding to the stop mechanism 30,31,32a,32b as described above, i.e. a stop mechanisme provided with corresponding operating bow members extending along the bow portions 16b and 16c of the boom 16. As further illustrated in Fig. 3, said first sail section (the storm sail) 12 is secured by means of a fixing strap 36 to a sliding member 37 slidable along a guide on said bow portion 16a between the position illustrated in unbroken lines and the position illustrated in broken lines. By using the sail board with the sail secured in the position illustrated in Fig. 1, with the mast 11 of a first sail section (the storm sail) 12 employed as active mast, the proper fore sail is in reality devided into two sections that may be rearranged in mutual relations by means of a pivot formed by the mast 13. In addition to the rigid connection between the masts 11 and 13 provided by the boom 16, the masts 11 and 13 are mutually connected at their top portions by means of a fixing strap 39 and at their lower end by means of a fixing strap 40. A fixing strap as referred to by the reference numeral 41, is connecting the lower end of said first sail section 12 with the lower end of the mast 13. The outer edge of the second sail section 14 may, by stretching same by means of a fixing strap secured to the outer end 42 of the boom, bend the mast to the shape as illustrated, whereas the mast 11, due to the straps 39 and 40, are bended to a corresponding bow shaped form. By swinging the booms 16 and 17, and accordingly the sail sections 12 and 14, in mutual relations about the sleeve member 19, said sail sections 12 and 14 is adjustable to different angular positions in relation to each other. Simultaneously, said sail section 12 is allowed to move relatively free within the boom 16 between the positions that are shown in full lines, respectively in broken lines, controlled by the strap 36, the sliding member 37 and the guide 38. By movement of the sail section 12 between the outer positions in the boom 16, the air stream is allowed to stream in a controlled, restricted manner from opposite sides of the sail, dependant of the direction of the wind. In the position illustrated in Fig. 2, the sail board may be used with the second mast 13 as active mast. In this case the user may for instance allow the boom 16 and the associated sail section 12 to move towards the sail section 14, for thereby, to facilitate passage of the user in front of the mast 13 during a turning operation. Additionally, the sail sections 12 may be employed more or less as a storm sail to be shifted into different angular positions in relation to the fore sail 14. It is evident, without further illustration thereof in the drawings, that the bow portion 16a of the boom 16 is movable axially of the fastening point on the sleeve member 19, such that the boom 16 by swinging of the mast 13, allow one 16b (or 16c) of the bow portions of said boom to be located along the other sail section. Fastening of the bow portion 16a in different axially located positions may, alternatively, be provided by means of separate, not further shown bracing means, or by means of said bracing means locking the boom in different angular positions about the mast 13. By sole axial movement of the bow member 16a of the boom 16 axially and transversely of the mast 13, one may achieve a special adjustment possibillity for increasing and decreasing the opening of the gap between the sail section 12 and the mast 13. In Fig. 6 is illustrated a firm, but somewhat elastically yieldable mast 58, the lower end ^ 50a of which is arranged to be secured in a manner as ' known per se to a sail board (not shown) . To the mast 50 is connected a first, narrow sail section 51 by means of a pipe shaped guide 51a, 51b. Between said guides 51a and 51b is a cavity 51c for connecting a boom 52 to a fastening portion 50b of the mast 50, in a manner as known per se. At the upper end 50c of the mast 50 it is secured a bracket 53 extending sideways from the mast 50 and provided with a row of fixing holes 53a. The lower end of said sail section 51 is connected by means of a connecting rope 54 to a fastening portion 55 on the lower end 50a of the mast 50, whereas the upper end of said sail section 51, by means of a connecting rope 56 is connected to a fixing hole 53a in said bracket 53. With reference numeral 57 is indicated a row of sleeve forming guides to receive through passing bracing laths to stretch the sail face of the sail sections within its associated boom 52. A second, somewhat broader sail section 58 is illustrated with a somewhat greater sail face than said first sail section 51. Said sail sections are at their lower ends, by means of a rope part or wire part 59, secured to a fixing pin 60 at the lower end of a pipe shaped lath 61 (or mast) that is being treaded endways onto pipe shaped guides 58a,58b in said sail section 58. With reference numeral 58c is shown a cavity in said sail section 58 between said guides 58a and 58b, arranged to make direct connection between said lath 61 and a bracing portion 62 of the boom 52. A fixing rope 63 extends from said fastening portion 55 on the mast 50 to a fastening portion on the sail section 58. Further, a wire 65 (or alternatively, a rope) extends from said fastening portion 55 on the mast 50 through the lower end of the lath 61, endways of the lath 61 to a fixing hole 53a of the bracket 53. In addition, a fixing rope may also be secured between the upper end of said sail section 58 and a fixing hole 53a of the bracket 53. Even though the present embodiment illustrates two mutually separate sail sections, which are directly or indirectly connected to a common mast, it is obvious, that also different other solutions may be utilised, in which the sail sections are mutually connected at local spacings, especially " near the upper respectively the lower end of said sail sections, however such that there is provided passage of air mainly in the central area between said sail sections. With the expression "sail section" is herein being meant both saparate sails and mutually connected sail portions. As will be evident from Fig. 8, said wire 65 passes a through passing guide 66 of the bracing portion 62 by providing a cavity 61a in one of the side edges of the lath 61, to establish an efficient connection between said wire and said bracing portion 62. Said bracing portion 62 extends sideways in said cavity, whereas said lath 61 by means of said cavity 61a may form a journal bearing and an axial support against said bracing portion 62. As illustrated in full lines, respectively in broken lines in Fig. 8, the sail section 68 is allowed to be relocated in a flexible manner in relation to the bracing portion 62 providing a safe and secure guiding thereof, by means of one outer portion 61b of said lath 61. As shown with unbroken, respectively, broken lines, said sail section 51 is allowed to be relocated from one side to another of the leading edge of the sail section 68, in order to form aero-dynamic stream passages between the sail sections. From Fig. 8 it is further evident, that the opposite outer portion 61c of the lath on its surface is provided with a groove to receive endways therein and to support therein a sail bracing lath 67, arranged in a pocket portion 57 in said sail section 58. Each of said laths is supported endways in said groove of the lath 61. A number of such laths 67 extend flush with corresponding sail bracing laths in corresponding pocket portions in said sail section 51. Said bracing portion 62 comprises a central transverse member 71 and two mutually opposite end members 72 (only one thereof is being shown herein) . Said transverse member 71 is formed by a longitudinally bent pipe profile member (see Fig. 9) provided with a longitudinal slit 73 in one side portion of said transverse member, and provided with said guide 66 in the opposite side portion of said transverse member. At each end (only one end is shown in Fig. 9) of said pipe profile memberis welded thereto a nut 74 provided with internal thread 75. In said slit 73 between the nuts 74 is a sliding member 76 interlocked in such a way, that same is movable longitudinally of said slit between the nuts located at the ends thereof. The end member 72 is provided with a pair of opposite slits 77 flush with said slit 73 of the transversal member 71, such that axial movement of said end members will not restrict movement of the sliding member 76 in the slit 73. The end member 72 is provided with an outer thread 78 cooperating with the thread 75 of the nut 74. In this manner said end member 72, by means of a sufficient number of whole or half turnings, is allowed to be adjusted axially into and out of said transverse member, as may be required. At the outer end the end member 72 same is provided with a support portion 79 with a cylinder half shaped support surface 79a arranged to form a support against the associated side portion of the boom 52, and accordingly, to support the bracing portion 52 in axially adjustable manner between the two opposite boom portions 52a and 52b of the boom. The boom per se is by means of inherent spring force arranged to be pushed inwards against associated end members 72 in a desired position. By axial extension of the bracing portion 62, said two portions 52a and 52b of the boom is being pushed in a similar manner away from each other, whereas the ends 52c and 52d of the boom hence in, a similar manner is drawn towards each other. Accordingly, the ends of the boom may be pushed in a direction away from each other, in order to allow the opposite portions 52a and 52b of the boom to be suspended towards each other. The support portions 79 may be secured to one respective side portion of the boom by means of fixing straps or similar fixing means, as indicated with broken lines 79b. It will also be possible - instead of welding the nuts 74 to the transverse member 71 - to arrange the nuts pivotable on said transverse member (not further shown) . Accordingly, the nuts 74 may be employed as adjustment means for axial adjustment of the lenght of the bracing portion 72, without rearranging the end members 72 in relation to the boom by each and every adjustment. As shown in Fig. 8,- the sliding member 76 is provided with an eylet 80. By means of a fixing ring 81 said sliding member 76 is secured direct to the rear edge 51c of the sail section 51 by means of a sail bracing lath 68 and by means of a corresponding pocket formation 57 in the sail section 58. The rear edge 58d of the sail section 58 is secured by means of a strap 62 to an eylet 83 at the adjoining end 52d of the boom 52. Initially, by rigging an amount of sails, the bracing member 62 is extended to a preferred lenght to press the boom portions 52a and 52b in direction away from each other, whereas " the ends 52c and 52d accordingly are pressed against each other. After having secured the sail sections 51 and 58 on the mast 50 respectively on the lath 61 and on the boom, said pressure on the sail sections 51 and 58 may be adjusted by adjusting the boom portions 52a and 52b to and fro, as may be required. A flexible lath may be used instead of the wire 65, and instead of fastening such wire or such lath at a specific portion of the transverse member 71, said wire or said lath may be allowed to move on the transverse member by means of a sliding member (similar to the sliding member 80 as shown in Fig. 8) in a second groove (similar to the groove 73 as shown in Fig. 8). However, said second groove is arranged to be shorter than the other groove 73, in order that the wire and the lath 65 and, accordingly, the leading edge of said second sail section in all embodiments thereof is arranged to be spaced inwards of the rear edge of the first sail section. Thus, a sufficiently large gap of air may be provided between the sail sections at one or the other side thereof as may be required. The rear edge of said first sail section according to Fig. 8 is terminated near the rear edge of the first sail section beyond the transverse member, and e.g. some few centimeters beyond the leading edge of the second sail section. A more distinct leading effect may thus be achieved along the first sail section and past the leading edge of the second sail section and further along the leeward side of the - second sail section. » * In Figs. 10 and 11 is illustrated an embodiment, wherein the sail rigging consists of one mast 90, one boom 91 and one sail 92. The sail 92 comprises in the illustrated embodiment a first sail section 93 and a second sail section 94 mutually connected at their upper and lower ends, but along most of their lenght they are separated along a longitudinal slit 95 therebetween. The sail sections are performed with a pocket formation or a corresponding curve in the canvas. Said first front sail section 93 is at the leading edge 93a of the sail section provided with a longitudinal guide 96 being treaded onto the mast in usual manner, and is provided with a pair of transverse laths 97,98 in the central portion thereof. At the upper and lower ends, i.e. at the transition portion between. the sail sections 93 and 94, it is provided laths 99,100 extending unitary in the whole breadth of the sail 92. The second sail section 94 is along the leading edge 94a provided with a longitudinal guide (not further shown) to receive a longitudinal lath 101 or a similar bracing member, which may be secured at one end thereof to the top 90a of the mast 90 and at the opposite end thereof to the lower portion 90b of the mast 90. Laths 97a and 98a in the sail section 94 extend flush with the laths 97,98 in the sail section 93. In Fig. 10 a first cavity 102 is performed at the leading edge 93a of the sail section 93 to connect the leading edge 91a of the boom 91 to the mast 90. At the rear edge 93b of the sail section 93 a second cavity is provided to recive a transverse connecting means 104 and a turing means 105, and at the leading edge 94a of the sail section 94 a corresponding cavity 106 is performed to receive said connecting means 104 and turning means 105. As shown in Fig. 11 the connecting means 104 comprises an annular rope extending over four wheels 106-109 and in a loop over said turning means 105. More detailed, said rope 104 has a rope part 104a extending transversely of the boom 91 between the wheels 106 and 107 and further in a loop in an annular groove 105a around the turning means 105. When employed, the sail, i.e. the sail sections 93 and 94, may easily be moved by wind pressure from one side of the boom to the other. More specificly explained, said sail sections may easily be moved from the illustrated position in Fig. 11, wherein it is provided with a pocket formation at the right hand side of the boom, to a corresponding position provided with a pocket formation at the left hand side of the boom, whereas the connecting means or the rope 104 is allowed to move freely over the wheels 106-109, simultaneously as the turning means 105 is rolling along the rope part 104a. By means of broken lines to the right hand side of Fig. 11, is illustrated a transverse tensional bending in and a dampening of the rope part 104b extending between the wheels 107 and 108. By holding the rope part 104b one may force the turning means 105 to roll along the rope part 104a, urged by the wind pressure. By rolling the turning means 105 along the rope part 104a, the rear edge 93b of the sail section 93 is guided in a curve in front of and beyond the leading edge 94a of the sail section 94, from the position to the right in Fig. 11 to a corresponding position to the left in Fig. 11, as illustrated in broken lines. In Fig. 12 is shown a detail of the connection between the turning means 105 and the rope part 104 and the rear edge 93b of the sail section 93 and the leading edge 94a of the sail section 94. In the embodiment of Fig. 10-12 a circular wheel is applied as turning means 105 and junctions are shown at opposite ends of the wheel. In an embodiment as illustrated in Fig. 13 a modified turning means 110 has a longitudinal, oval disc shape with one junction arranged at one outer end of the disc and the other junction (the junction for the leading edge 94a of the sail section 94) arranged in the center of the disc. In such case said annular rope 104 of Fig. 10-12 may be substituted by a rope, wherein one end of which is fixed to one side of the boom, whereas the opposite end is fixed to the opposite side of the boom, i.e. the wheels 106-109 may be deleted and by the rolling off of the turning means on the rope, relative movement of the rear edge 93a of the sail section 93 in respect of the leading edge 94a of the sail section 94 is defined, simultaneously as same are being rearranged from side to side within the boom. Alternatively, additional parts of the rope may be used in a similar way, as shown in broken lines in Fig. 11, to provide an adjustment force in the rope for adjusting the position of the turning means, and thus, to adjust the gap between the rear edge 93b of the sail section 93 and the leading edge 94a of the sail section 94. According to a third embodiment of the arrangement of the invention a boom 91, i.e. a common boom for the sail sections 93,94, is provided with a rope part 104a extending transversely of the boom 91 in a central or forward portion thereof. A turning means 105,110 forming a junction between the rear edge 93b of said first front sail section 93 and the leading edge 94a of said second rear sail section 94 are arranged to roll along the rope part 104a in order to roll off the turning means 105,110 from one side to the other of the boom. Simultaneously, the rear edge 93b of said first sail section 93 is moved from a position outside and behind the leading edge 94a of said second sail section 94, at one side of the boom, to a position outside and behind the leading edge of said second sail section 94, at the opposite side of the boom. In the latter embodiment, the rear edge of said first sail section may be urged to move in relation to the leading edge of said second sail section, simultaneously, as said edges are moved from side to side within the boom.

Claims: CLAIMS : 1. Sail board arrangement, wherein the sails of the sail board include a first (12; 51; 93) and a second (14; 58; 94) sail section with an intermediate air gap, each of the sail sections are stretched between an associated mast (11; 50; 90) and an associated boom arrangement (16; 17; 52; 92) with a pocket formation in each of the sail sections, characterised in that said first (front) sail section (12; 51; 93) with its leading edge (93a) is connected direct to the mast (11; 50; 90), whereas said second (rear) sail section (14; 58 94) with its leading edge (94a) is connected to the mast through a bracing means (13; 65; 101), which in its turn is connected to the mast or the first sail section by the upper and lower portion of said first sail section, and that the leading edge of said first sail section is movable from side to side within the boom arrangement in front of and sideways of the leading edge of the second sail section to adjust the air gap from side to side in relation to said second sail section, thus leading an air stream from said first sail section through said air gap transversely backwards and outwards along the leeward side of said second sail section. 2. Arrangement according to claim 1, characterised in that said first sail section (12) is movable by its leading edge within a first boom (16), whereas said second sail section (14) is movable by its leading edge within a second boom (17), and said second boom (17) is adjustable and fixable angularly in relation to said first boom (16) about an axis extending rectangularly on the main plane of the boom. 3. Arrangement according to claim 2, characterised in that the boom (16) of said first sail section (12) is mainly triangle shaped, with one of its corners connected to a first mast (11) and with the opposite side (16a) of the triangle connected, by preference, so as to be axially adjusted, close to the other mast (13) . 4. Arrangement according to claim 3, characterised in that said opposite side (16a) of the triangle forms a guide for a sliding member (37) to which is connected to said second edge of said first sail section by means of a strap (36) or a similar connecting means. 5. Arrangement according to claim 1, characterised in that a boom (62), which is a common boom for said sail sections (51,58), is provided with a bracing device (62) extending transversely of the boom in the central portion thereof, by preference closer to the front end (62c) than to the rear end (62d) thereof, whereas the rear edge (51c) of said first sail section (51) is slidably connected to one side edge of said bracing device, and the leading edge (at 58a,58b) of said second sail section (68) is secured to or sladably connected to the opposite side edge of the bracing device. 6. Arrangement according to claim 5, characterised in that the rear edge of said first sail section (51) carries a sliding means (76) forming a sliding engagement with a curved guide on said one side edge of the bracing device (62), by preference a circularly curved guide arranged concentric of the leading edge portion (at 51a,51b) of said sail section (58), and that the leading edge of said second sail section (58) forms a sliding engagement with a curved guide on said opposite side edge of the bracing device (62). 7. Arrangement according to claim 5 or 6, characterised in that said second sail section (58), connected to the mast (50) of the first sail section at the upper (50b) and lower end (50a) thereof, is braced by means of a lath (61) supporting the second sail section (58) along its leading edge (at 58a,58b). 8. Arrangement according to one of claims 5 - 7, characterised in that a wire (65) or rope extends continuously from the upper end (50a) of the mast (50) of said first sail section (51) through a guide along the leading edge (at 58a,58b) of said second sail section (58) to the lower end (50a) of the mast (50) of said first sail section, whereas said wire (65) or rope extends either through a guide (66) in the bracing device (62) to form a turning means between said second sail section (58) and said bracing device (62) or is connected to a sliding means movable sideways in relation to the main wire or rope direction. 9. Arrangement according to claims 7 and 8, characterised in that the wire (65) or rope extends endways through the lath (61) which is provided with a longitudinal tube profile. 10 Arrangement according to claim 1, characterised in that a boom (91), which is a common, boom for said sail sections (93,94), is provided with a rope part (104a) extending transversely of the boom (91) in the central or forward area thereof, and that a turning means (105,110) forming a junction between the rear edge (93b) of said first, front sail section (93) and the leading edge (94a) of said second, rear sail section (94) is arranged to be rolled off along the rope part (104a) to move the turning means (105,110) from one side to the other of the boom and simultaneously adjusting the rear edge (93b) of said first sail section (93) from a position outside and behind the leading edge (94a) of the second sail section at one side of the boom to a position outside and behind the leading edge (94a) of said second sail section (94) ' at the opposite side of the boom. 11. Arrangement according to claim 10, characterised in that the turning means (105,110) is provided with a circumferential groove (105a) to adopt a loop formed portion of the rope part (104a) to roll off said turning means in a loop shaped path of said rope part, and that the turning means (105,110) is linked to the rear edge (93b) of said first sail section (93) in a first pivot and is linked to the leading edge (94a) of said second sail section (94) in a second pivot by a mutual spacing, substantially shorter than the largest extension of the turning means (105, 110). 12. Arrangement according.to claim 11, characterised in that the turning means (110) extends longitudinally of said first and second pivots arranged mutually flushing along the longitudinal axis of said turning means, by preference at one end of said turning means.

Inventors: HAMUNEN ISTO, HAMUNEN, ISTO
Applicants: HAMUNEN ISTO, HAMUNEN, ISTO
Application year: 1986
Main classification: B63H9
IPC codes: B63B35