CA1211655A - Sloop rigged yacht board - Google Patents
Sloop rigged yacht boardInfo
- Publication number
- CA1211655A CA1211655A CA000433582A CA433582A CA1211655A CA 1211655 A CA1211655 A CA 1211655A CA 000433582 A CA000433582 A CA 000433582A CA 433582 A CA433582 A CA 433582A CA 1211655 A CA1211655 A CA 1211655A
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- Canada
- Prior art keywords
- sail
- mast
- jib
- boom
- pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
PAGE .1.
"SLOOP RIGGED YACHT BOARD"
* ABSTRACT *
A wind propelled apparatus comprising a body mast main sail and a pair of boom members laterally disposed and accurately connected athwart the mast and securing the main sail taut therebetween, with an additional jib sail secured forward of the mast.
The jib sail is held taut between a pair of boom members which have been extended forward and athwart the mast , being joined at the outer ends by boom connectors together in the center and to the mast by spreaders forestays shrouds travellers backstays and all other necessary rigging of the types of construction and materials that are currently available.
The sail system has a plurality of axies of rotation and the sail shapes may be altered by the user to suit wind strength and direction.
The operation and use is similar to existing apparatus , however additional skill is required to tune the adjustments of the sails in tandum to obtain optimum results.
A sail board is used in this example , however many types of yachts , boats , and vehicles may be modified.
DATED THIS Thirteenth DAY OF July 1983.
C.R. Rutson CHRISTOPHER ROBERT RUTSON
END.
"SLOOP RIGGED YACHT BOARD"
* ABSTRACT *
A wind propelled apparatus comprising a body mast main sail and a pair of boom members laterally disposed and accurately connected athwart the mast and securing the main sail taut therebetween, with an additional jib sail secured forward of the mast.
The jib sail is held taut between a pair of boom members which have been extended forward and athwart the mast , being joined at the outer ends by boom connectors together in the center and to the mast by spreaders forestays shrouds travellers backstays and all other necessary rigging of the types of construction and materials that are currently available.
The sail system has a plurality of axies of rotation and the sail shapes may be altered by the user to suit wind strength and direction.
The operation and use is similar to existing apparatus , however additional skill is required to tune the adjustments of the sails in tandum to obtain optimum results.
A sail board is used in this example , however many types of yachts , boats , and vehicles may be modified.
DATED THIS Thirteenth DAY OF July 1983.
C.R. Rutson CHRISTOPHER ROBERT RUTSON
END.
Description
~211 ~iS~
"SLOOP RIGGED YACHT-BOARD"
*
Line.No.
1. This invention relates to certain improvements in the sail plan and rigqing of wind propell~d aparatus !3uch as surfboards, sail-boards, small yachts, canoes, b~ats, sail boats, multihull boats, lce-boats, skateboards, sleds, and wind p~opellea land vehicles of the type that use sail attachments masts and riggiiny that are dependant upon a pair of boom members laterally disposed cmd accurately connected athwart said mast and securing a main~sail t:aut therebetween.
The above designs use only a nnain-sail, however it has been found in practice by yachts and simi.lar sailing craft that the sailing 10. cha~acteristics of these cra~t are improved with the addition of a Jib-sail or fore-sail. With the addition of this extra sail in front of the main-sail the sail plan of a "sloop" is produced and the pointing ability of the craft is impxoved together with the overall aerodynamic eficiency of the sails.
It is the ob~ect of this invention to improve the existing main-sail only t~pe designs so that it is possible to obtain similar benefits in per~ormance to that of the sloop-rigged yacht designs. ~his will result in the apparatus being able to point higher toward the direction from which the wind i9 coming from. The aerodynamic slot between the 20. two sails Improves air flow, reduces turbulance and drag, and lowers the stalling point of the main-sail. The ~ib-sail has less turbulance _~ its luff than the main-sail and takes advantage of the upwash of air flowing past the main-sail to produce added driving force wh~ch is more forward and less sideways than the main-sail. The adjustable stays, shrouds, travellexs, outhauls and sheets enable more effective control 26. of forestay tension, mast bend and sail shape, while the height ~i.
~2~ $~
of the connection point between the forestay and the mast may be altered to form a fractional rig.
In one broad aspect, the present invention relates to an apparatus fox the wind propulsion of a sail-board or like support arranged to support a. user comprising: (a) a mas-t arranged for pivotal connection to the board or like support by a joint means having a plurality of axes of nnovement; (b) a paix of boom members laterally disposed relative to and connected abeam of the mast to have main parts extending rearwardly and forwardly of the mast, (c) a main-sail secured to the mast and extending rearwardly from the mast: and (d) means to secure the main-sail between the main parts of the boom members; characterized in that (e) the pair of boom members have further parts extending forwardly of the mast in sucn a way that the forward interconnection point of the booms and that of the jib-sail apex is allowed to be lifted or dropped in the same plane as that of the mast and the jib-sail luffs; (f) a jib-sail or fore-sail is secured to the mast by attachment points to exten~ forwardly of the mast so that the two luffs form a triangle at their for~ard apex, this apex also connects to the boom interconnection point and both luff tensions and sail shape are adjustable from a single control at the mast lower connection point; (g) means to secure the jib-sail or fore-sail between the further parts of the pair of boom members; the arrangement providirlg that t~e main-sail and jib-sail or fore-sail extend above and below the pair of boom members such that the lower jib-sail luff runs directly to the for~Jard boom interconnection point to form a triangle with the plane of the booms, and the . $5~i main-sail passes below the booms without being penetrated by the spreader bar.
In another broad aspect the present invention relates to a jib-sail for a sailboard having a mast adapted to be rigged with a jib-sail, said sail having a luff with an upper portion sloped to the top of said ma~st and a Lower portion sloped to the bottom of said mast, the forward vertex of said sail being adapted for connection to ~ boom member.
In another broad aspect, the present invention relates to a boom spreader for use with a sailboard having an upright mast and a pair of lateral booms extending forwardly and rearwardly of said mast, said boom spreader comprising a bar for placement normal to a mast and adjacent thereto; means integral with said bar for connecting said bar to said mast and permitting said bar to rotate about said mast; and means on each end of said bar for fitting said bar to said booms.
In another broad aspect, the present invention relates to the combination, for use with a sailboard provided with a universal joint for itting a mast thereto, o a mast, a boom spreader adjacent and normal to said mast, and a pair of lateral boom members spread apart by said boom spreader and extending forwardly and rearwardly of said mast and connected to one another at their forward and rearward ends, wherein said boom spreader is rotatable about said mast, and said boom members extend a -3(a)-~l2~ S~
sufficient extent ~orwardly of said mast whereby a jib~sail can be f.itted be~ween the forward ends of said booms and said mast.
In another broad aspect, the present invention relates to a sailboard comprising: a board to support a user; a mast piv~tally connected to the board by a universal joint; a pair of boom members laterally disposed to, and connected abeam of, the mast and extending rearwardly ~f the mast; a mainsail secured to ~he mast and extending rearwardly from the mast; and means to secure the main taut between the boom members; wherein: the pair of boom members extend forward]Ly of the mast; a jib-sail or fore-sail is secured to the mast by means co-extensive with the luff thereof and extends forwardly of the mast; and means to secure the jib-sail or fore-sail taut between the pair of boom members; 50 arranged that the main-sail and jib-sail or fore-sail extend below the pair of boom members to lower the centre of pressure of the sails and to provide a self-tacking ability for the jib-sail or fore-sail.
In operation the use is similar to the existing apparatus, however additional skill is require.d to tune the adjustments of the jib-sail and the main-sail in tandum to obtain optimum results dependant upon wind strength and direction.
In drawings which illustrate, by way of example, embodiments of the present invention:
Figure 1 is a perspective view of a rig according to the _~_ - ~ 2~
present invention rigged with a jib-sail according to the present invention .
Figure 2 is a detail of the boom spreader of the present invention.
Figure 3 is a detail of the mast sleeves e~nployed in the rig shown in Figure 1.
Referring to Figure 1, a mast 1 for a sailboard or like vessel or vehicle (sucll as skate-board or ice boat) is adapted to be fitted to the deck of ~he vessel by means of a mast foot 11 which is provided with a universal joint.
The mast 1 can then be pivotted at any angle to the deck, by the operator of the sailboard. A pair of arcuate lateral boom members 2, joined together at their respective ends by moulded V-shaped clips 4 extend fore and aft, and surround the mast 1.
The boom members 2 are typically tubular aluminium (or any other light metal or synthetic), and are spread apart by a boom spreader 3.
The boom spreader 3 (see Figure 2) comprises a bar 31 which extends traversly to the mast 1, and is provided with a moulded U-shaped fitting 32 at this point of intersection with the mast 1, for fitting with th~ mast 1. A shock cord (not shown) is also fitted around the mast 1, and to the U-shaped fitting 32 to ensure a close fit between the mast 1 and the spreader 3.
However, the spreader 3 is free to rotate about the mast 1.
"SLOOP RIGGED YACHT-BOARD"
*
Line.No.
1. This invention relates to certain improvements in the sail plan and rigqing of wind propell~d aparatus !3uch as surfboards, sail-boards, small yachts, canoes, b~ats, sail boats, multihull boats, lce-boats, skateboards, sleds, and wind p~opellea land vehicles of the type that use sail attachments masts and riggiiny that are dependant upon a pair of boom members laterally disposed cmd accurately connected athwart said mast and securing a main~sail t:aut therebetween.
The above designs use only a nnain-sail, however it has been found in practice by yachts and simi.lar sailing craft that the sailing 10. cha~acteristics of these cra~t are improved with the addition of a Jib-sail or fore-sail. With the addition of this extra sail in front of the main-sail the sail plan of a "sloop" is produced and the pointing ability of the craft is impxoved together with the overall aerodynamic eficiency of the sails.
It is the ob~ect of this invention to improve the existing main-sail only t~pe designs so that it is possible to obtain similar benefits in per~ormance to that of the sloop-rigged yacht designs. ~his will result in the apparatus being able to point higher toward the direction from which the wind i9 coming from. The aerodynamic slot between the 20. two sails Improves air flow, reduces turbulance and drag, and lowers the stalling point of the main-sail. The ~ib-sail has less turbulance _~ its luff than the main-sail and takes advantage of the upwash of air flowing past the main-sail to produce added driving force wh~ch is more forward and less sideways than the main-sail. The adjustable stays, shrouds, travellexs, outhauls and sheets enable more effective control 26. of forestay tension, mast bend and sail shape, while the height ~i.
~2~ $~
of the connection point between the forestay and the mast may be altered to form a fractional rig.
In one broad aspect, the present invention relates to an apparatus fox the wind propulsion of a sail-board or like support arranged to support a. user comprising: (a) a mas-t arranged for pivotal connection to the board or like support by a joint means having a plurality of axes of nnovement; (b) a paix of boom members laterally disposed relative to and connected abeam of the mast to have main parts extending rearwardly and forwardly of the mast, (c) a main-sail secured to the mast and extending rearwardly from the mast: and (d) means to secure the main-sail between the main parts of the boom members; characterized in that (e) the pair of boom members have further parts extending forwardly of the mast in sucn a way that the forward interconnection point of the booms and that of the jib-sail apex is allowed to be lifted or dropped in the same plane as that of the mast and the jib-sail luffs; (f) a jib-sail or fore-sail is secured to the mast by attachment points to exten~ forwardly of the mast so that the two luffs form a triangle at their for~ard apex, this apex also connects to the boom interconnection point and both luff tensions and sail shape are adjustable from a single control at the mast lower connection point; (g) means to secure the jib-sail or fore-sail between the further parts of the pair of boom members; the arrangement providirlg that t~e main-sail and jib-sail or fore-sail extend above and below the pair of boom members such that the lower jib-sail luff runs directly to the for~Jard boom interconnection point to form a triangle with the plane of the booms, and the . $5~i main-sail passes below the booms without being penetrated by the spreader bar.
In another broad aspect the present invention relates to a jib-sail for a sailboard having a mast adapted to be rigged with a jib-sail, said sail having a luff with an upper portion sloped to the top of said ma~st and a Lower portion sloped to the bottom of said mast, the forward vertex of said sail being adapted for connection to ~ boom member.
In another broad aspect, the present invention relates to a boom spreader for use with a sailboard having an upright mast and a pair of lateral booms extending forwardly and rearwardly of said mast, said boom spreader comprising a bar for placement normal to a mast and adjacent thereto; means integral with said bar for connecting said bar to said mast and permitting said bar to rotate about said mast; and means on each end of said bar for fitting said bar to said booms.
In another broad aspect, the present invention relates to the combination, for use with a sailboard provided with a universal joint for itting a mast thereto, o a mast, a boom spreader adjacent and normal to said mast, and a pair of lateral boom members spread apart by said boom spreader and extending forwardly and rearwardly of said mast and connected to one another at their forward and rearward ends, wherein said boom spreader is rotatable about said mast, and said boom members extend a -3(a)-~l2~ S~
sufficient extent ~orwardly of said mast whereby a jib~sail can be f.itted be~ween the forward ends of said booms and said mast.
In another broad aspect, the present invention relates to a sailboard comprising: a board to support a user; a mast piv~tally connected to the board by a universal joint; a pair of boom members laterally disposed to, and connected abeam of, the mast and extending rearwardly ~f the mast; a mainsail secured to ~he mast and extending rearwardly from the mast; and means to secure the main taut between the boom members; wherein: the pair of boom members extend forward]Ly of the mast; a jib-sail or fore-sail is secured to the mast by means co-extensive with the luff thereof and extends forwardly of the mast; and means to secure the jib-sail or fore-sail taut between the pair of boom members; 50 arranged that the main-sail and jib-sail or fore-sail extend below the pair of boom members to lower the centre of pressure of the sails and to provide a self-tacking ability for the jib-sail or fore-sail.
In operation the use is similar to the existing apparatus, however additional skill is require.d to tune the adjustments of the jib-sail and the main-sail in tandum to obtain optimum results dependant upon wind strength and direction.
In drawings which illustrate, by way of example, embodiments of the present invention:
Figure 1 is a perspective view of a rig according to the _~_ - ~ 2~
present invention rigged with a jib-sail according to the present invention .
Figure 2 is a detail of the boom spreader of the present invention.
Figure 3 is a detail of the mast sleeves e~nployed in the rig shown in Figure 1.
Referring to Figure 1, a mast 1 for a sailboard or like vessel or vehicle (sucll as skate-board or ice boat) is adapted to be fitted to the deck of ~he vessel by means of a mast foot 11 which is provided with a universal joint.
The mast 1 can then be pivotted at any angle to the deck, by the operator of the sailboard. A pair of arcuate lateral boom members 2, joined together at their respective ends by moulded V-shaped clips 4 extend fore and aft, and surround the mast 1.
The boom members 2 are typically tubular aluminium (or any other light metal or synthetic), and are spread apart by a boom spreader 3.
The boom spreader 3 (see Figure 2) comprises a bar 31 which extends traversly to the mast 1, and is provided with a moulded U-shaped fitting 32 at this point of intersection with the mast 1, for fitting with th~ mast 1. A shock cord (not shown) is also fitted around the mast 1, and to the U-shaped fitting 32 to ensure a close fit between the mast 1 and the spreader 3.
However, the spreader 3 is free to rotate about the mast 1.
2~
Moreover, it is preferred to provide a tapered mast, with a s-teel, other metal or synthe-tic mast sleeve 73 to couple with the U-shaped fitting 32. The sleeve 73 is of suitable diameter to fit snuggly on the tapered mast l at the appropriate height and thereby prevent downward slippage of the spreader.
At each end of the bar of the spreader 3 is a short fore and aft extending tubular eleme!nt 33 each of which ~its snuggly around a boom 2 to maintain sa~le in position.
At each end of the boa,m members there is provided an outhaul pulley 9 and 14 for the sail outhaul shèets 91 and 141, which will be described below. In association with the outhaul pulleys and sheets there are provided outhaul sheet cleats 92 and 1~2, at least one each for the jib outhaul ~sheet and the main outhaul sheet. The outhaul cleats are located on the booms 2, about midway between the ends of the booms and the spreader, so as to be easily reached by an operator standing on the deck of a sailboard.
In a preferred embodiment, a series of spaced steel mast sleeves 71, 72, 73 and 74 are provided, as shown in Figure 1, and in detail in Figure 3. The mast sleeves are of suitable diameters each to fit the tapered mast l at a predetermined height, and not slip downwardly. As shown in Figure l, there are preferably four sleeves. The top sleeve 71 is provided with a ring or loop to engage a snapshackle or like clasp on the mainsail 5 (which will S~
be described below). The secon~ sleeve 72 is loca~ed slightly below the top sleeve and is provided with a loop or ring 15 to engage a snapshackle on the jib sail 12 (described below). The third sleeve 73, described above, is at the level of the boom spreader 3, and serves to strengthen the mast 1 and aid in easy rotation of the spreader 3 about the mast 1.
The fourth sleeve 74 is located adjacent the mast foot 11, and is provided with a looE) or ring to engage a snapshackle or like clasp on the jib sail. It: will be understood that the upper three sleeves 71, 72 & 73 will remain vertically stationary on the mast 1, but the lower sleeve 74~ because of the taper in the mast 1, will be capable of sliding up the mast 1 to the level of the spreader 3, thereby to change the jib sail 1~ pattern, and give the operator greater control of the rig. It will also be understood that because several alternate jib sail patterns are provided, (as shown in Figure 1 in phantom) it may be desirable to attach the jib 12 to the top sleeve 71 instead of ~e second sleeve 72.
The mainsail 5 is triangular, and, as described above, the top-most vertex is connected by a clasp to the top-most sleeve 71. The lower vertex, which extend well below the booms, is provided with a main luff downhaul sheet 10 of nylon, polyester or the like, and is cleated in a main luff downhaul cleat (not shown) on the mast foot 11. Alternatively, the lower vertex may be clasped to the lowest sleeve. Batten pockets 8 with battens (not ~2~ ~iS~
shown) are provided on the mainsail, to stiffen same. The rearmost vertex of the mainsail 5 is provided with a mainsail C outhaul sheet ~, which passes through the main outhaul and is cleated in a main outhaul sheet cleat 92, as described above. It is preferr~ed to provide a main outhaul sheet cleat 92 on each boom, for eas~e of operation. Either can be utilized, dependi~g on the position of the operator.
Preferably, the luff of the mainsail is provided with a series of sewn mast pockets, into which the mast can be fitted.
As shown in Figure 1, the mast pockets are inkerrupted by the mast sleeves. The mainsail is also provided with a window.
The jib sail 12, which heretofor has never been seen on sailboards, is also trian~ular, and as noted above, is clasped to a pair of mast sleeves 71 or 72, and 74 near the top and bottom of tha mast 1. The forward vertex of the jib sail is provided with a jib outhaul sheet 141, which passes through the jib outhaul pulley 14, as described above, and is cleated to the jib outhaul sheet cleat 142, as described above, on the boom 2. It is preferred to provide a jib outhaul sheet cleat on each boom, for ease of ~0 operation.
The jib luff 131 is preferably wire, fitted into the sail fabric, to stiffen the jib luff, and reduce turbulence.
Alternatively, other forms of stiening such as batten in battens pockets may be employed as jib fore stays.
-` ~2~l.$S~
In a second embodiment, the mast is tubular With a longitudinally extending T-slot on its rearmost side. In this embodiment, mast sleeves and mainsail mast pockets are not necessary, but rather, the mainsail is provided, at spaced intervals along its luff, with nylon slides which ~it into the T-slot. At the top and bottom of the mast, loops are provided to which the jib can be attached by snapshackles or like clasps.
With the present invention, the provisio~ of ~he jib-sail 12 forwardly of the mast 1 move!s the centre of pressure forwardly towards the mast 1, reducing the effective turning moment about the mast. In addition, by having both the main 5 and jib-sails 12 extending below the twin booms 2, the centre of pressure is lowered (i.e. moved towards the joint connecting the mast to the board) reducing the moment tending to tip the sail over. This means that the rider can control a given sail area more easily or, alternatively, increase the sail area and still have full control of the sailboard.
Referring to sailboards (and wind-surfers) generally, the provision of the ]ib-sail forward of the mast would not be 2~ obvious. The usuaL method of turning or tacking into the wind is for the rider to walk or move from one side of the board to the other by stepping around the front of the mast. The provision of the jib-sail would appear to prevent this action. With the present invention, the rider tilts the mast rearwardly to cause ~I Z~ 5~
the forward end of the booms tand the jib-sail) to travel upwardly and rearwardly in an arc until the forward end of the booms is substantially above the base of the mast. The rider then steps around the mast, moving hand-over-hand around the booms to the other side of the jib-sail. He then turns the sails to the opposit~ tack. Using this method he does not have to step any further than with the conventional rig and he can maintain full control of the sails during the change of tack.
The slot 6 between the sails (see Figure 1) allows the sails to be more easily pulled from the water by the rig uphaul sheet due to the escape of the water off the sails, which are individually smaller in area than with conventional single sail craft.
If the winds become stronger than expected, the jib-sail may be reefed to reduce the sail area to less than that of a single sail, whereby the total sail area can be varied by changing the jib-sail area without any change to the mainsail area.
Moreover, it is preferred to provide a tapered mast, with a s-teel, other metal or synthe-tic mast sleeve 73 to couple with the U-shaped fitting 32. The sleeve 73 is of suitable diameter to fit snuggly on the tapered mast l at the appropriate height and thereby prevent downward slippage of the spreader.
At each end of the bar of the spreader 3 is a short fore and aft extending tubular eleme!nt 33 each of which ~its snuggly around a boom 2 to maintain sa~le in position.
At each end of the boa,m members there is provided an outhaul pulley 9 and 14 for the sail outhaul shèets 91 and 141, which will be described below. In association with the outhaul pulleys and sheets there are provided outhaul sheet cleats 92 and 1~2, at least one each for the jib outhaul ~sheet and the main outhaul sheet. The outhaul cleats are located on the booms 2, about midway between the ends of the booms and the spreader, so as to be easily reached by an operator standing on the deck of a sailboard.
In a preferred embodiment, a series of spaced steel mast sleeves 71, 72, 73 and 74 are provided, as shown in Figure 1, and in detail in Figure 3. The mast sleeves are of suitable diameters each to fit the tapered mast l at a predetermined height, and not slip downwardly. As shown in Figure l, there are preferably four sleeves. The top sleeve 71 is provided with a ring or loop to engage a snapshackle or like clasp on the mainsail 5 (which will S~
be described below). The secon~ sleeve 72 is loca~ed slightly below the top sleeve and is provided with a loop or ring 15 to engage a snapshackle on the jib sail 12 (described below). The third sleeve 73, described above, is at the level of the boom spreader 3, and serves to strengthen the mast 1 and aid in easy rotation of the spreader 3 about the mast 1.
The fourth sleeve 74 is located adjacent the mast foot 11, and is provided with a looE) or ring to engage a snapshackle or like clasp on the jib sail. It: will be understood that the upper three sleeves 71, 72 & 73 will remain vertically stationary on the mast 1, but the lower sleeve 74~ because of the taper in the mast 1, will be capable of sliding up the mast 1 to the level of the spreader 3, thereby to change the jib sail 1~ pattern, and give the operator greater control of the rig. It will also be understood that because several alternate jib sail patterns are provided, (as shown in Figure 1 in phantom) it may be desirable to attach the jib 12 to the top sleeve 71 instead of ~e second sleeve 72.
The mainsail 5 is triangular, and, as described above, the top-most vertex is connected by a clasp to the top-most sleeve 71. The lower vertex, which extend well below the booms, is provided with a main luff downhaul sheet 10 of nylon, polyester or the like, and is cleated in a main luff downhaul cleat (not shown) on the mast foot 11. Alternatively, the lower vertex may be clasped to the lowest sleeve. Batten pockets 8 with battens (not ~2~ ~iS~
shown) are provided on the mainsail, to stiffen same. The rearmost vertex of the mainsail 5 is provided with a mainsail C outhaul sheet ~, which passes through the main outhaul and is cleated in a main outhaul sheet cleat 92, as described above. It is preferr~ed to provide a main outhaul sheet cleat 92 on each boom, for eas~e of operation. Either can be utilized, dependi~g on the position of the operator.
Preferably, the luff of the mainsail is provided with a series of sewn mast pockets, into which the mast can be fitted.
As shown in Figure 1, the mast pockets are inkerrupted by the mast sleeves. The mainsail is also provided with a window.
The jib sail 12, which heretofor has never been seen on sailboards, is also trian~ular, and as noted above, is clasped to a pair of mast sleeves 71 or 72, and 74 near the top and bottom of tha mast 1. The forward vertex of the jib sail is provided with a jib outhaul sheet 141, which passes through the jib outhaul pulley 14, as described above, and is cleated to the jib outhaul sheet cleat 142, as described above, on the boom 2. It is preferred to provide a jib outhaul sheet cleat on each boom, for ease of ~0 operation.
The jib luff 131 is preferably wire, fitted into the sail fabric, to stiffen the jib luff, and reduce turbulence.
Alternatively, other forms of stiening such as batten in battens pockets may be employed as jib fore stays.
-` ~2~l.$S~
In a second embodiment, the mast is tubular With a longitudinally extending T-slot on its rearmost side. In this embodiment, mast sleeves and mainsail mast pockets are not necessary, but rather, the mainsail is provided, at spaced intervals along its luff, with nylon slides which ~it into the T-slot. At the top and bottom of the mast, loops are provided to which the jib can be attached by snapshackles or like clasps.
With the present invention, the provisio~ of ~he jib-sail 12 forwardly of the mast 1 move!s the centre of pressure forwardly towards the mast 1, reducing the effective turning moment about the mast. In addition, by having both the main 5 and jib-sails 12 extending below the twin booms 2, the centre of pressure is lowered (i.e. moved towards the joint connecting the mast to the board) reducing the moment tending to tip the sail over. This means that the rider can control a given sail area more easily or, alternatively, increase the sail area and still have full control of the sailboard.
Referring to sailboards (and wind-surfers) generally, the provision of the ]ib-sail forward of the mast would not be 2~ obvious. The usuaL method of turning or tacking into the wind is for the rider to walk or move from one side of the board to the other by stepping around the front of the mast. The provision of the jib-sail would appear to prevent this action. With the present invention, the rider tilts the mast rearwardly to cause ~I Z~ 5~
the forward end of the booms tand the jib-sail) to travel upwardly and rearwardly in an arc until the forward end of the booms is substantially above the base of the mast. The rider then steps around the mast, moving hand-over-hand around the booms to the other side of the jib-sail. He then turns the sails to the opposit~ tack. Using this method he does not have to step any further than with the conventional rig and he can maintain full control of the sails during the change of tack.
The slot 6 between the sails (see Figure 1) allows the sails to be more easily pulled from the water by the rig uphaul sheet due to the escape of the water off the sails, which are individually smaller in area than with conventional single sail craft.
If the winds become stronger than expected, the jib-sail may be reefed to reduce the sail area to less than that of a single sail, whereby the total sail area can be varied by changing the jib-sail area without any change to the mainsail area.
Claims (13)
1. Apparatus for the wind propulsion of a sail-board or like support arranged to support a user comprising:
(a) a mast arranged for pivotal connection to the board or like support by a joint means having a plurality of axes of movement;
(b) a pair of boom members laterally disposed relative to and connected abeam of the mast to have main parts extending rearwardly and forwardly of the mast;
(c) a main-sail secured to the mast and extending rearwardly from the mast; and (d) means to secure the main-sail between the main parts of the boom members;
characterized in that (e) the pair of boom members have further parts extending forwardly of the mast in such a way that the forward interconnection point of the booms and that of the jib-sail apex is allowed to be lifted or dropped in the same plane as that of the mast and the jib-sail luffs;
(f) a jib-sail or fore-sail is secured to the mast by attachment points to extend forwardly of the mast so that the two luffs form a triangle at their forward apex, this apex also connects to the boom interconnection point and both luff tensions and sail shape are adjustable from a single control at the mast lower connection point;
(g) means to secure the jib-sail or fore-sail between the further parts of the pair of boom members;
the arrangement providing that the main-sail and jib-sail or fore-sail extend above and below the pair of boom members such that the lower jib-sail luff runs directly to the forward boom interconnection point to form a triangle with the plane of the booms, and the main-sail passes below the booms without being penetrated by the spreader bar.
(a) a mast arranged for pivotal connection to the board or like support by a joint means having a plurality of axes of movement;
(b) a pair of boom members laterally disposed relative to and connected abeam of the mast to have main parts extending rearwardly and forwardly of the mast;
(c) a main-sail secured to the mast and extending rearwardly from the mast; and (d) means to secure the main-sail between the main parts of the boom members;
characterized in that (e) the pair of boom members have further parts extending forwardly of the mast in such a way that the forward interconnection point of the booms and that of the jib-sail apex is allowed to be lifted or dropped in the same plane as that of the mast and the jib-sail luffs;
(f) a jib-sail or fore-sail is secured to the mast by attachment points to extend forwardly of the mast so that the two luffs form a triangle at their forward apex, this apex also connects to the boom interconnection point and both luff tensions and sail shape are adjustable from a single control at the mast lower connection point;
(g) means to secure the jib-sail or fore-sail between the further parts of the pair of boom members;
the arrangement providing that the main-sail and jib-sail or fore-sail extend above and below the pair of boom members such that the lower jib-sail luff runs directly to the forward boom interconnection point to form a triangle with the plane of the booms, and the main-sail passes below the booms without being penetrated by the spreader bar.
2. Apparatus for propulsion as claimed in Claim 1 characterized in that the distance between the stays is adjustable to vary the shape of the jib-sail or fore-sail.
3. Apparatus for propulsion as claimed in Claim 1 or 2 characterized in that the lower of the two stays on the jib-sail or fore-sail is secured to the base of the mast.
4. Apparatus for propulsion as claimed in Claim 1, 2 or 3 characterized in that the pair of boom members are rotatably connected abeam the mast by a pair of spreaders which pass forward of the mast.
5. Apparatus for propulsion as claimed in Claim 1, 2 or 3 characterized in that the boom members are curved inwardly of the jib-sail or fore-sail rearwardly of the main-sail.
6. Apparatus for propulsion as claimed in Claim 1 characterized in that the distance between the interconnection points of the jib-sail stays at the forward apex of the jib-sail and the forward ends of the booms is adjustable to vary the distance between the jib-sail forward apex and the mast-boom interconnection point to vary the shape of the jib-sail or fore-sail to adjust the stay-tension whereby the angle between the jib-sail luffs can be varied to adjust the jib-sail shape, by using the adjustment in distance between jib-sail forward apex and mast, and mast attachment point spacing.
7. Apparatus for propulsion as claimed in Claim 1 characterized in that the spreaders pass forward of the mast and they are able to rotate and also to slide lengthwise on the mast at the point of connection with the mast due to the shock cord hereby jib luffs and stays form adjustable triangle for sail shaping.
8. A sail-board as claimed in Claim 1 characterized in that the sail-board covers canoes, boats, sailboats, multihullboards, iceskates, iceboats, skateboards, trailboards, sled and wind propelled land vehicles.
9. The combination, for use with a sailboard provided with a universal joint for fitting a mast thereto, of a mast, a boom spreader adjacent and normal to said mast, and a pair of lateral boom members spread apart by said boom spreader and extending forwardly and rearwardly of said mast and connected to one another at their forward and rearward ends, wherein said boom spreader is rotatable about said mast, and said boom members extend a sufficient extent forwardly of said mast whereby a jib-sail can be fitted between the forward ends of said booms and said mast.
10. A combination as in Claim 9, wherein said boom spreader is rotatably connected to said mast at a selected height substantially corresponding to the shoulder height of a user thereof.
11. The combination claimed in Claim 9, wherein said boom-spreader comprising a bar for placement normal to a mast and adjacent thereto; means integral with said bar for connecting said bar to said mast and permitting said bar to rotate about said mast; and means on each end of said bar for fitting said bar to said booms.
12. The combination of Claim 11 wherein said means for connecting said bar to said mast comprises a joint fittable with said mast and connectable therewith.
13. The combination of Claim 12 wherein said means for connecting said bar to said booms comprises a pair of members of a size selected to tightly fit with said boom members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000433582A CA1211655A (en) | 1983-07-29 | 1983-07-29 | Sloop rigged yacht board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000433582A CA1211655A (en) | 1983-07-29 | 1983-07-29 | Sloop rigged yacht board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211655A true CA1211655A (en) | 1986-09-23 |
Family
ID=4125769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000433582A Expired CA1211655A (en) | 1983-07-29 | 1983-07-29 | Sloop rigged yacht board |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1211655A (en) |
-
1983
- 1983-07-29 CA CA000433582A patent/CA1211655A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |