JPS60215492A - Fore-and-aft sail - Google Patents

Abstract

PURPOSE:To prevent the rear portion of a fore-and-aft sail from being increased in curvature by wind from the oblique front and thus to prevent a portion with a maximum depth from shifting backward, by decreasing the degree of extension of a panel toward the trailing edge thereof. CONSTITUTION:A fore-and-aft sail generally consists of a front panel, a rear panel 30, a lower panel and a sleeve which are seamed with each other. The rear panel 30 is formed by cutting sail cloth 40 comprising a base sheet 41 and adjusting sheets 42 and 43. The adjusting sheets 42 and 43 are superposed and bonded to the surface of the base sheet 41 serially in that order such that the total thickness of the sheets increases gradually from one side edge 40a to the other side edge 40b and the degree of extension of the rear panel 30 is therefore reduced gradually toward the trailing edge 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vertical sail used for sailboards and sailboards.

(Prior art) The vertical sail welcomes the wind from the leading edge along the manuto4, and the wind flows along the curved canvas that contains the wind.
The boat is propelled by the moving direction component of the lift force generated in the vertical direction, and as shown by the solid line X in Fig. 5, the leading edge 1
It is said that an airfoil shape with a maximum depth of around 4 is preferable. The circumference of the vertical sail is the leading edge 1 attached to the mast M.
, is held by the rear edge and lower edge (only the rear edge 2 with reinforcement 3 is shown) that is strongly stretched by the boom, and each spring /I/ (canvas), which is originally flat, is subjected to wind pressure and rotates in the vertical and horizontal directions. It extends to form the three-dimensional curved surface of the sail. Conventionally, the shape of each panel that makes up the sail has been cut, the way the panels have been sewn, and the bending rigidity of the snaps has been devised so that when exposed to wind, I was trying to get a curved surface like the solid line X. However, when a conventional vertical sail receives wind from diagonally forward as shown by the arrow,
Since the wind pressure at the rear where the angle of attack is large is large, the curvature of the sail surface at the rear becomes large, and as a result, the angle of attack at the rear increases and the wind pressure at the rear becomes even greater.This vicious cycle repeats, resulting in As shown by the dotted chain line Y, the curvature of the rear part became large and the maximum depth inevitably moved rearward, and this tendency was particularly noticeable in strong winds. As a result, the center of wind pressure shifts to the rear, making the sail heavier and difficult to control, and it also becomes difficult for the wind to flow out smoothly from the trailing edge of the sail, reducing propulsion efficiency.

(Objective of the Invention) The object of the present invention is to reduce the elongation rate of the panel as it approaches the trailing edge, so that the curvature of the rear part becomes sharp even when the wind blows diagonally forward as described above. The biggest part is getting a vertical sail that doesn't move backwards.

(Structure of the invention) Huh! The longitudinal sail of the present invention, which has been made to achieve the object of the present invention, is characterized by being equipped with a panel formed by sequentially polymerizing and bonding adjustment sheets to the base seam so that the thickness becomes progressively thicker as it approaches the trailing edge. .

(Effects of the Invention) The longitudinal sail according to the present invention has panels 11 (11) (111) formed by sequentially polymerizing and adhering adjustment sheets to the main sea 1- so that the sails become thicker as they approach the trailing edge. The elongation rate of the panel decreases as it approaches , and the curvature of the rear part of the vertical sail becomes 1 (1), so even if the wind is stronger than the front, the maximum depth moves backwards, making the sail heavier. This prevents the control from becoming a problem or reducing propulsion efficiency.

(Example) Figures 1 to 4 show examples of vertical sails for sailboards. The vertical sail of this embodiment has a front panel 20 sewn together and a rear spring) as shown in FIG. 1 as a whole.
, lower spring) v61 and sleeve 21. As shown in FIGS. 6 and 4, the other side edge 41 is lower than the − side edge 40a.
] The basic sheet 41 is made so that it becomes thicker as it approaches b.
The present invention is embodied in a structure in which a canvas 40 is cut by sequentially polymerizing adjustment sheets 42 and 43 on the surface of the canvas.

In this embodiment, the front, rear, and lower panels 20 and 30 degrees are each made of a sheet made of polyester film and polyester cloth bonded together to increase the strength of the bag. As shown in FIG. 1, a sleeve 21, which forms the front edge 10 of the vertical sail, is sewn to the curved front edge of the front panel 20.

A triangular lower panel filter 1 is sewn along the suture line 14 to the front lower part of the rear spring) V60, and both springs /L/60. Sew the front edge of filter 1 and the rear edge of front spring v20 along suture line 13. The front and rear edges are curved to project somewhat from each other, and when sewn along the suture line 13, the cross-sectional shape is as shown by the two-dot chain line B in FIG.
20 and the rear spring zlz30 are connected with a slight bend at the suture line 16. Windows 22 and 32 each made of a transparent sheet are provided at the lower part of the front spring/L'20 and at the lower part extending from the rear panel 50 to the lower spring (v61).

The rear spring/l'30 is -111 for a constant tensile force.
The elongation rate is large on the 1st edge 402 side, and the other 1111th edge 40bl
A canvas 40 with a small elongation rate at the opening 11 is used. Canvas 4o
As shown in FIGS. 3 and 4, a base sheet 41 spanning the entire width, a first adjustment sheet 42 having a narrower width and aligned at the edge 401 of the other tile 1) and bonded to the base sheet 41 by polymerization, The width is even narrower than this, and the other side edge 4
It consists of a second adjustment sheet 46 that is polymerized and adhered to the first adjustment sheet 42 so as to coincide at 0b. Each sheet 41.42
．． 43Fi, both of which are made by polymerizing and adhering the above-mentioned polyester film and polyester cloth, and the canvas 40 is formed by polymerizing and adhering each sheet 41°42.
It is constructed so that it becomes thicker as it approaches the other side edge 40b, and the elongation rate of each portion is adjusted as described above. The canvas 40 is manufactured by interposing an adhesive film 44, 45 between the sheets 41, 42, 43 that are once sent out from the rolls, as shown in FIG. Glue it and roll it up again. And from the canvas 4o obtained in this way,
As shown in FIG. 6, the rear spring/L'30 is cut so that the other side edge 40b, which has a smaller elongation rate, becomes the rear edge 11.

In this embodiment, the second adjustment sheet 46 was polymerized and adhered onto the first adjustment sheet 42, but the second adjustment sheet 43 may be polymerized and adhered to the surface of the basic sheet 41 opposite to the first adjustment sheet 42. Further, the number of adjustment sheets is not limited to two as in this embodiment.

Along the lower edge 12 of the vertical sail are two reinforcing strips 35 of different widths.
36 is provided by gluing or sewing, and further a lower edge reinforcement 67 spanning both sides of the lower edge 12 is sewn.

An upper reinforcement 66 is provided at the upper part of the rear edge 11 by gluing or sewing, and a front and lower panel rear spring/L is provided at the front end of the lower edge 12.
A triangular rear reinforcement 34 is sewn near the rear end 16 of the '30 to provide a backhoe/l'38.

On the sides of the front and rear springs/I/2o and 3o, from the sleeve 21 to the rear edge 11, 84 χ'/CX snap pockets 15 are installed. In addition, the trailing edge 11
The lower edge reinforcement 37 and a secondary edge reinforcement (not shown) may be provided.

In the vertical sail of this embodiment, as shown in No. 11 (1), the sleeve 2
A rope (not shown) is inserted into the back pole 68 by the rear end of the Wishbone poom W whose front part is attached to the mast M at the notch 21a of the sleeve 21. The rear end 16 of the longitudinal sail is strongly pulled rearward through the
Use with the edge 12 firmly stretched. The center l of the vertical sail in this example
The cross-sectional shape near X11 is t1↑ when there is no wind.
As shown by the two-dot chain line B in ``No. 21'' as mentioned above, if the wind is received from diagonally forward as shown by the arrow, as shown by the solid line A, the area around 1/8 from the leading edge 10 It becomes an airfoil shape with maximum depth. The canvas has a curved three-dimensional curved surface not only in the cross section shown in Figure 2, but also in the vertical section perpendicular to this.
Therefore, the curvature of the sail surface depends on wind pressure and the elongation (not bending) of each panel. If the wind from diagonally forward becomes stronger, the increase in wind pressure at the rear of the vertical sail where the angle of attack is large will be large, but the elongation rate of the rear panel 30 decreases as it approaches the trailing edge 11 due to the first and second adjustment sheets 42 and 43. Therefore, even if the wind pressure increases, the degree of increase in the curvature at the rear of the vertical sail is small. Therefore, although the cross-sectional shape A in Figure 2 becomes deeper overall, the curvature at the rear is particularly large. The maximum depth does not move backwards.

” In the embodiment described above, the other side edge 40 is smaller than the − side edge 4Da.
A roll-shaped canvas 40 that becomes thicker as it approaches b is prepared in advance and cut to make the rear spring 1v50. First, the basic sheet 41 is cut into the shape of the rear spring) v60, and then the The rear spring/L' 30 may be formed so that it becomes thicker as it approaches the rear edge 11 by polymerizing and bonding the two adjusting sheets 42, 43.

In this example, the vertical sail is for a sailboard, so the vertical sail is made up of the front, rear, and lower springs/V20 + 50 + 31 and the sleeve 21. In this case, the vertical sail may be composed only of the canvas 40 consisting of the basic sheet 41 and the adjustment sheets 42 and 43.

(Effects of Embodiment) As mentioned above, in the second embodiment, the curvature of the rear part of the canvas is particularly large and the maximum depth part does not move rearward even when a strong wind is received from diagonally forward. Each panel, especially each sea of the rear panel 30) 41,42.43
By using sheet ~1- made of film and reinforcing cloth as a material, each sheet 41, 42, 43 can be surely polymerized and bonded.
Since a stable and uniform elongation rate can be obtained for each part, a desired sail curve with few errors can be obtained during use.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 being an overall side view, Figure 2 being a cross-sectional view of Figure 1, Figure 6 being a perspective view of the canvas, and Figure 4 being a cross-sectional view of the canvas. Figure 5 shows the state of polymerization and adhesion of canvas.
The figure is a diagram equivalent to Figure 2 of the conventional product. Explanation of symbols 11...Rear edge, 60...Panel (rear spring/I/)
, 41...basic sheet), 42.43...adjustment sheet. Applicant Tono Craft Co., Ltd. Agent Patent Attorney Teru Hase - (1 other person)

Claims (1)

[Claims] This patented vertical sail is equipped with panels made by sequentially polymerizing and adhering adjustment sheets to a basic sheet so that the thickness gradually decreases to 1 yen as it approaches the trailing edge.