GB2030948A

GB2030948A - Improvements in and relating to sailing craft

Info

Publication number: GB2030948A
Application number: GB7839836A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-10-09
Filing date: 1978-10-09
Publication date: 1980-04-16
Also published as: GB2030948B

Abstract

The present invention is concerned with crafts driven by sails and particularly sailing boats or sail- driven yachts. The craft comprises a sail 4 (Figure 1) of which the lower end is attached to a yard 7 which is pivoted at 8 on a boom 9 which is itself pivoted at 10 on the mast 2. A fastening device 14 is provided whereby the yard 7 can be made rigid with the boom 9 so that the sail 4 will pivot about the mast. Displacement of the boom 9 about the mast is controlled by a carriage 11 which can be maintained fixed in position so that, with the device 14 released, the sail 4 will pivot about the axis passing through the pivot point 8. <IMAGE>

Description

SPECIFICATION Improvements in and relating to sailing craft The present invention relates generally to craft driven by means of sails and more particularly to sailing boats or sail-driven yachts. In this type of craft, the lower edge or foot of the sail (or of each sail) is attached to a rigid boom pivotally connected to the mast. It has also been proposed to attach the foot to a yard itself pivotally connected to the boom at an intermediate point of its length.

In accordance with the present invention, means are further provided for selectively blocking either the yard with respect to the boom, or the boom with respect to the hull of the craft, so that the sail may pivot either on itself or about the mast, as desired.

The invention will be more readily understood on reading the following description with reference to the accompanying drawings in which: Fig. 1 is a view in elevation of a first embodiment of a sailing boat according to the invention.

Fig. 2 is a section along Il-Il (Fig. 1).

Fig. 3 shows a variant sail divided into two elements with intermediate slit.

Fig. 4 is a section along IV-lV (Fig. 3).

Fig. 5 shows a modification of the arrangement according to Fig. 3.

Fig. 6 shows a variant sail not extending to the top of the mast.

Figs. 7 and 8 show in section a rope of large diameter on which are wound the two elementary sail-cloths of a double-thickness sail the opposite edges being connected by a sliding element.

Fig. 9 is a part elevational view of the rope of Figs. 7 and 8, the sail being assumed to have been removed.

Referring now to the drawings, the sailing boat of Figs. 1 and 2 comprises a hull 1 supporting a conical tubular mast 2 with an upper end 3 bent rearwardly in swan neck fashion. A halyard passes inside the mast, to which is attached the top of a mainsail 4 of which the front vertical edge is fixed to a rope 5 independent of the mast 2. The lower edge or foot of the sail 4 comprises a rope 6 of which the ends are fixed to a yard 7 pivoted at a point of its length (about one third thereof from the front) on a boom 9 which is in turn pivoted on the mast 2 at 10. The rear end of the boom 9 is held in any suitable manner, for example by being attached to a carriage 11 fixed in position on a tiller 12. The sail 4 is stiffened by a series of horizontal slats 13.

The rope 5 is composed of a very large flexible pipe of conical longitudinal section, which is strongly inflated, on which the front part of the sail 4 (here made in single-thickness) is folded so as to produce an aerodynamic section avoiding harmful turbulences.

The lower rope 6 and the slats 16 are advantageously in the form of strongly inflated pipes (but of smaller diameter than the rope 5), which reinforces them and dampens the vibrations under the effect of the wind.

14 denotes a fastening device connecting the yard 7 to the boom 9 at a sufficient distance from the pivoting point 8 to ensure a substantially rigid connection. The fastening device 14 may be constituted by a metal stirrup member overlapping the two pieces and tightened thereon. Under theseconditions, the sail 4 may be oriented about the mast 2 by displacement of the boom 9 with the aid of the carriage 11. The rope 5 is then just behind the mast 2, but due to its large diameter, this is not a drawback. Everything occurs as in the case of an aircraft wing comprising a slot at the front.

If the fastening device 14 is removed and the carriage 11 is maintained fixed, the sail 4 may then be oriented by pivoting on itself, i.e. about an axis passing through point 8 and through the end of the swan neck 3.

In the example shown in Figs. 1 and 2, the jib 1 5 is arranged, like the mainsail 4, with a rope 1 6 composed of a large inflated pipe and a lower rope 17, preferably also composed of an inflated pipe, but of a smaller diameter. This rope 17 is attached by its ends to a yard 18 pivoted at 19 on a boom 20, itself pivoted on the mast 4 at 21. A carriage 22 movable on a tiller 23 enables the boom 20 to be oriented and a fastening device 24 may block the yard 1 8 on this boom.

25 denotes an auxiliary swan neck to which the top of the jib 1 5 is attached.

In Fig. 2, the jib 1 5 and the mainsail 4 are disposed in line with each other, thus forming an assembly comparable with the slotted wing of an aircraft, the mast 2 being lodged in the slot in question.

Figs. 3 and 4 show an arrangement in which the mainsail is divided into two elementary parts or sails 4a, 4b to make, independently of the jib, a section in the form of the slotted wing of an aircraft. The front part 4a is folded around a front rope 5a, the rear part 4b around another rope 5b.

The lower ropes 6a, 6b of the two parts are attached to the same yard 7 pivoted at 8 on the boom 9. There again, the ropes are composed of inflated flexibie pipes, 5a and Sb being of very large diameter.

A stay such as 27 is preferably housed in the slot provided between the two elementary parts or sails 4a, 4b.

In the variant embodiment of Fig. 5, each of the two elementary sails 4a, 4b is attached to an individual elementary lower yard 7a, 7b, respectively, and these two yards are respectively pivoted at 8a, 8b on the common yard i, itself pivoted on the boom 9. Fastening devices (not shown) may advantageously be provided between the elementary yards 7a, 7b and the common yard 7, this multiplying the possibilities of orientation.

In Fig. 6, the mainsail 4, made in one piece as in Figs. 1 and 2, stops at the level of the upper slat referenced 13a, which is provided to act as rope, its ends being connected to the swan neck 3 by two stays 26. This arrangement enables the surface of the sails to be reduced when desired.

In Figs. 7 to 9, it has been assumed that the sail was made in known manner of two sailcloths forming therebetween an inner, possibly inflated space so that the assembly produces an aerodynamic section similar to that of an aircraft wing. The two elementary sailcloths 4m and 4n are thus wound by a certain angle around a front rope 5 made in the form of a fairly strongly inflated pipe of large diameter. However, their opposite edges are not directly connected to each other. An elementary element 40 is, on the contrary, provided over the height of the rope 5, which comprises two opposite vertical notches 40a, 40b in which are slidably engaged the opposite edges of the sailcloths 4m, 4n, these edges being given additional thickness in manner known per se.

Furthermore, the central part of the element 40 is perforated for the passage of an auxiliary rope 41.

A comparison of Figs. 7 and 8 clearly shows that, due to this arrangement, the sail assembly 4m, 4n may slide by rotating on the rope 5, displacing the element 40 until the tensions of the two sails are balanced. This has two consequences: 1. as the sail must be able to be used with in curvation on one side or the other, it must necessarily be symmetrical, i.e. the two sailcloths 4m, 4n must be of equal length. When the wind is blowing to port or starboard and the sail is incurved, the under and upper parts of the sailcloths are no longer of equal length and they have different tensions. Due to the freedom of slide of the element 40 on the rope 5, this difference disappears and the aerodynamic section may be conserved without inflation or exaggerated contraction.

2. When the sail is oriented, it rotates about the rope and consequently one sailcloth winds whilst the other unwinds, this again provoking a difference in tension. The free slide of the element 40 enables it to be compensated.

Of course, frictions tend to brake the element 40 on the rope 5, but due to the inevitable vibrations, this effect is negligible. The auxiliary rope 41 also tends to retain the element 40, but if its ends are very close to those of the main rope, this is not substantial.

The element 40 may be made in one piece or of a plurality of successive parts fitting on one another on the auxiliary rope 41. The edges of the two sailcloths 4m, 4n must be able to slide freely in the notches 40 a, 40b so that they may be hoisted or lowered with the aid of a two-armed halyard.

Claims

CLAIMS 1. A sailing craft in which the foot of a sail is attach-ed to a yard pivoted on a boom, itself pivoted on the mast, this sail, provided to be of single or double-thickness, preferably comprising a sectioned front edge, wherein said craft comprises means for selectively blocking either the yard with respect to the boom, or the boom with respect to the hull of the craft, so that the sail may pivot either on itself or about the mast, as desired. 2. A craft as claimed in Claim 1, wherein the sail is divided into a plurality of successive elementary sails, each having at its front edge a rope of large diameter made of an inflated pipe, to produce an aerodynamic section in manner known per se. 3. A craft as claimed in Claim 2, wherein the foot of each elementary sail is attached to an elementary yard, these elementary yards being individually pivoted, at an intermediate point of their length, on a common yard itself pivoted on the boom. 4. A craft as claimed in Claim 1 , wherein the sail comprises an upper edge fixed to an approximately horizontal rope, preferably made in the form of an inflated pipe and of which the ends are connected to the top of the mast by stays, so as to obtain a sail of the so-called square type. 5. A craft as claimed in Claim 1, of the type comprising a sail partially or entirely of double thickness, made of two sailcloths connected by their rear edges and with a front rope of large diameter, made for example in the form of an inflated pipe, wherein the front edges of the two sailcloths are connected by means of an element mounted on an auxiliary rope so as to surround the main rope, in order that the sail assembly, of which the inner space is free or possibly inflated, may slide by rotating freely on the main rope under the effect of the differences in tension of the sailcloths, in order to take the desired section of aircraft wing during all manoeuvres automatically and without making folds. 6. A sailing craft substantially as described hereinabove and illustrated in the accompanying drawings. New claims or amendments to claims filed on 18th June, 1979. Superseded claims: 1 to 6. New or amended claims: 1 to 8.

1. A sailing craft comprising a hull supporting a mast, å sail of which the upper end is attached to the mast and of which the foot is attached to a yard pivoted on a boom, the boom being pivoted on the mast and means for selectively blocking either'pivotal movement of the yard with respect to the boom, or of the boom with respect to the hull of the craft, so that the sail can pivot either about the pivotal connection of the yard on the boom or about the mast.

2. A craft as claimed in Claim 1, wherein the sail is divided into a piurality of successive elementary sails, each having at its front edge a rope of large diameter made of an inflated pipe, to produce an aerodynamic section.

3. A craft as claimed in Claim 2, wherein the foot of each elementary sail is attached to an elementary yard, the elementary yards being individually pivoted, at an intermediate point of their length, on a common yard itself pivoted on the boom.

4. A craft as claimed in Claim 1, wherein the sail comprises an upper edge fixed to an approximately horizontal rope of which the ends are connected to the top of the mast by stays, so as to obtain a sail of the so-called square type.

5. A craft as claimed in Claim 4, wherein the rope is in the form of an inflated pipe.

6. A craft as claimed in Claim 1 , wherein the sail is partially or entirely of double thickness, made of two sailcloths connected by their rear edges and with a front rope of large diameter, wherein the front edges of the two sailcloths are connected by means of an element mounted on an auxiliary rope so as to surround the main rope, in order that the sail assembly, of which the inner space is free or inflated, may slide by rotating freely on the main'rope under the effect of the differences in tension of the sailcloths, in order to take the desired section of aircraft wing during all manoeuvres automatically and without making folds.

7. A craft as claimed in Claim 6, wherein the main rope is in the form of an inflated pipe.

8. A sailing craft substantially as herein described and illustrated in the accompanying drawings.