| DE3121402A1 | 1982-12-16 | |||
| FR1188077A | 1959-09-18 | |||
| US4385579A | 1983-05-31 | |||
| DE2712018A1 | 1978-09-21 |
| 1. | DEFINING THE INVENTION ABE AS FOLLOWS. A wind propelled apparatus comprising a body adapted to support a user while being propelled by wind, a mast, or masts, pivotably coupled to the body by means of a joint extending between the mast and the body and having a plurality of axies of rotation, a pair of boom members laterally disposed and accurately connected athwart the said mast, a mainsail and means of extending the sail laterally from the mast and securing the said sail taut between the boom members, and particularly characterised by improvements in the form of •a Jibsail, a pair of boom members extended forward of the mast, two "ϋ" shaped boom connectors one single and one triple roller, fore and back stays, shrouds, travellers, spreaders, sheets, outhauls, blocks and cleats, as described and necessary for the adjustment of the improvements. |
| 2. | The apparatus of claim 1 wherein the said means for supporting the Jibsail comprises a pair of boom members laterally disposed and accurately connected athwart by means of a spreader system and extending forward of the said mast, connected at their outer ends by "ϋ" shaped connectors, and securing the said Jibsail laterally taut therebetween, the complete sail system having a plurality of axies of rotation. |
| 3. | The apparatus of claims 1 S 2 including means adapted to enable the said user to manipulate the said sails by attachment of holding points to either side thereof. |
| 4. | The apparatus of claims 1 to 3 including "U" shaped boom connector with triple roller fitting. O PI__. . |
| 5. | The apparatus of claims 1 to 4 including spreaders abeam the mast and encompassing the mast section, separating the two boom members equally on either side of the mast and being accurately connected to each boom member. |
| 6. | The apparatus of claims 1 to 5 including upper and lower forestay. |
| 7. | The apparatus of claims 1 to 6 including upper and lower backstay. |
| 8. | The apparatus of claims 1 to 7 including shrouds. |
| 9. | The apparatus of claims 1 to 8 adapted as a sailboard. |
| 10. | Sloop rigged yachtboard apparatus substantially as hereinbefore described with reference to the accompanying drawings. OMFI ^ :; O. |
"SLOOP RIGGED YACHT BOARD"
*DESC * RIPTION»
Line.No.
1. This invention relates to certain improvements in the sail plan and rigging of wind propelled aparatus such as surfboards, sail-boards, small yachts, canoes, boats, sail-boats, multi-hull boats, ice-boats, skateboards, sleds, and wind propelled land vehicles of the type that use sail attachments masts and rigging that are dependant upon a pair of boom members laterally ' disposed and accurately connected athwart said mast and securing a main-sail taut therebetween.
The above designs use only a main-sail, however it has been found in practice by yachts and similar sailing craft that the sailing 10. characteristics of these craft 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 improved together with the overall aerodynamic efficiency of the sails.
It is the object of this invention to improve the existing main¬ sail only type designs so that it is possible to obtain similar benefits in performance to that of the sloop-rigged yacht designs. This will result in the apparatus being able to point higher toward the direction, from which the wind is 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 jib-sail has less turbulance at its luff than the main-sail and takes advantage of the upwash of air flowing past the main-sail to produce added driving force which is more forward and less sideways than the " main-sail. The adjustable stays, shrouds, travellers, outhauls and sheets enable more effective control 26. of forestay tension, mast bend and sail shape, while the height
Line No.
1. of the connection point between the forestay and the mast may be altered to form a fractional rig.
According to this invention there is provided the existing main-sail only type of apparatus. This invention adds the following improvements as described herewith and including jib-sail, extended booms forward of the said mast, boom connectors, fore and back stays, diamond shrouds, travellers, spreaders, sheets, outhauls, blocks, cleats, etc, as necessary to produce windward performance similar to that of a sloop rigged yacht, while not limiting its performance 10. offwind or downwind.
In operation the use is similar to the existing apparatus, however additional skill is required to tune the adjustments of the jib- sail and the main-sail in tandu to obtain optimum results dependant upon wind strength and direction. The basic construction is similar to existing apparatus and the further details constitute the improvements.
The particular embodiment of the invention will now be described with reference to the accompanying drawings in which:-
Figure 1. is a vertical section, of the complete rig. 20. Figure 2. is a plan of the complete rig.
Figure 3. is a plan of the Twin-Booms and Spreaders.
Figure 4. is a vertical section of the Jib-sail and Main-sail.
Figure 5. is a vertical section of the Mast and Rigging.
The apparatus has a body adapted to support a user, in this case it is in the form of a fibreglass surfboard together with mast, mast- foot and fitting, twin boom members, and Main-sail and attachments.
•9
The board (1) is provided with a removable swing keel (2) rudder
28 fins (3) foot straps (4) mast step (5) bow (6) and stern (7) .
OMPI
-3-
Line.No.
1. The mast fitting (8) is connected to the mast step (5) by a flexible joint (9) in the form of a polyester lanyard and retainer.
So far the construction is similar to sail-boards previously in use, and the further details constitute the improvements.
A mast (10) of aluminium alloy circular section tubeing is attached to the mast fitting (8) by means of suitable pop rivets(11), it is slotted lengthwise on the rearmost side to accept the main-sail nylon slides (13),hounds (14) are pop riveted top and bottom facing to the rear to accept the backstays (15 & 16) with single angled tangs (17)
10. located at these "points also on the sides to accept the shrouds (18) and vernier adjusters (19)-. At the top and bottom ends and to the front of the mast are attached by pop rivets the stainless steel loopslides with stops on "T" track slides which serve as jib-travellers.
Two boom members (21 & 22) of aluminium alloy circular section tubeing are connected at either end by "TJ" shaped connectors of _nou-_ded
P.V.C. with one roller block for the jib-sail outhaul (23) and three roller blocks on the rear connector for the main-sail outhaul and two backstays (24) . These connectors are pop riveted to the booms and the jamb cleats at median points also fitted. Attachment points for the
20. user are in the form of a foam covering. (49) .
The spreaders (25) are also constructed of aluminium alloy tubeing with circular section and welded together then pop riveted to the boom members. Small chainplates are attached (26) for connection of the shrouds, and both the shrouds and the fore and back stays are stainless steel wire with swaged thimbles " (27) and shackles (28) being the means of attachment between the mast, booms and sails. The boom spreader is allowed to rotate about the mast but may be secured partially with a shock cord or bearing surface, (53) . Boom sleeves (54) .
-4-
Line No.
1 The main-sail (29) is fitted with nylon sail slides along its luff (30) and is threaded onto the mast via the slot entry points near the centre of the mast from the centre outwards both up and down. It is tensioned with halyards (31) and cleats (32) at either end and by the main outhaul sheet (33) on the boom. Reefing points are fitted (43) .
The jib-sail (34) is fitted along its luff (35) with piston hanks
(36) for easy attachment to the forestays (37 & 38) halyards (39) and
OOfHA °β cleats (40) jib^sheet (41) and cleats (42) and reefing points (43) .
The sails are dacron fitted with batten pockets and battens (44) 10. eyelets with reinforced sections (45) sail number (46) transparent windows (47) wind telltail (48) . A rig uphaul sheet is provided (50) .
To enable the backstays to cleat they are brought through the outhaul rollers then joined together and attached to a stiitable polyester sheet which then leads to the backstay jamb.cleat (51) which is situated on the boom opposite the main sheet outhaul jamb cleat (52) .
The variable adjustments of stays, shrouds, halyards, and sheets produce a great number of different sail shapes to suit the user dependant upon wind and sea conditions.
By constructing the apparatus in the manner set forth the 20. characteristics of a sloop rigged sailing apparatus are obtained, this produces a more e ficient sail plan than that of previous designs in this field that use twin-boom members.
O PI
■ >_ lFO ^'ΛTIO
Next Patent: A CLOSURE FOR A CONTAINER, SUCH AS AN INFUSION BOTTLE