WO2016011466A1

WO2016011466A1 - Sailing catamaran

Info

Publication number: WO2016011466A1
Application number: PCT/AT2015/000099
Authority: WO
Inventors: Barbara HEILIGENMANN; Kurt Heiligenmann
Original assignee: Heiligenmann Barbara
Priority date: 2014-07-21
Filing date: 2015-07-15
Publication date: 2016-01-28
Also published as: AT515558B1; AT515558A4

Abstract

The invention relates to a sailing catamaran which has two inflatable hulls (1) made of a flexible sheet material, and a frame extending in a horizontal plane, said frame having a front cross member (2.1) and a rear cross member (2.2), and two longitudinal members that connect these cross members together, wherein a mast (3), a trampoline (9), a skeg (4) and a rudder (12) are fixed to the frame, wherein a straight extension (8) projects under the plane of the frame from the foot of the mast (3) and wherein tensioning ropes (5) are stretched obliquely upwards to frame parts from the lower region of the extension (8), characterized in that the two longitudinal members of the frame are formed by the two inflatable hulls (1), and in that the connection between the mast (3) and the extension (8) projecting downwards from the foot of the mast (3) is flexurally rigid.

Description

T2015 / 000099

sailing catamaran

The invention relates to a sailing catamaran in which the two hulls consist of a flexible, flat material and are inflatable.

The AT 501895 A4 shows a sailing catamaran in which the connection between the two hulls is formed by a rectangular frame of two longitudinal beams and two cross beams. The mast protrudes from a plug-in bracket at the center of the front cross member. From the base of the mast out of the rod-shaped sword carrier sticks down, which is followed by the sword below. The connections of the front cross member with the mast and the sword carrier are not designed to transmit bending moments. Approximately horizontally from the center of the front cross member protrudes the so-called bowsprit, ie a rigid beam, forward. The top of the mast is connected by a respective stretched rope with the free tip of the bowsprit and with the left and right side members, wherein the respective connection point to a side member of both cross members spaced but significantly closer to the front cross member than the rear cross member. From the lower end of the sword carrier is also a tensioning cable to the three points on bowsprit and longitudinal beams stretched, where the ropes leading to the mast point are attached. By this measure, the bowsprit and the support of the frame can be relatively easily performed without the stiffness of the sailing catamaran suffers.

A similar construction as the AT 501895 A4 shows the CZ 9042 U 1. According to the CZ 9042 U1 the connection between the two hulls is formed by a rectangular frame consisting of three side rails and three cross beams. The mast protrudes from a plug-in mount, which is located at the intersection of the central longitudinal member with the central cross member. The sword protrudes from a vertically oriented rod-shaped sword carrier down, which is located directly below the mast on the middle cross member. The middle side member is extended forwards to a bowsprit. The mast top is connected by a respective stretched rope with the four points of contact of the outer support of the frame. From the longitudinal center of the cross member from each rod protrudes vertically downwards. Between the lower ends of these rods and the ends of the cross member tensioning cables are stretched. GB 2 213 435 A shows a collapsible sailing catamaran with rigid hulls. The frame connecting the hulls is formed of two cross members and a central longitudinal member, wherein the longitudinal member is extended forward towards a bowsprit. The cross members are formed of two articulated parts, wherein the hinge axes extend vertically and through the central side member. Thus, the cross member still have sufficient strength, projecting from their longitudinal center vertically from rods, run from the free ends tensioning cables to the ends of the cross member. To brace the mast, which protrudes from the crossing point of the front cross member with the central side member from, is stretched from the mast tip to the top of the bowsprit and to each of the two rigid hulls a rope.

The inventor has set itself the task of providing a collapsible sailing catamaran, in which the two hulls are made of a flexible sheet material and are inflatable provide. In contrast to the sailing catamarans known from the AT 501895 A4 and the CZ 9042 U1, the sailing catamaran to be created in a comparably large version should in any case have the following advantages:

- He should have a smaller pack size in disassembled state.

- He should be lighter.

- The production costs should be lower.

Optionally, the following goals should also be achievable:

- The sailing catamaran to be created should be able to be set up and dismantled faster,

- He should still have excellent sailing characteristics, so be fast, maneuverable and be able to sail on just one hull.

- He should have high beginner suitability, so be particularly easy to use and operator errors survive without damage.

It is based on the known from AT 501895 A4 construction, according to which the sailing catamaran hulls of a flexible sheet material, as well as a horizontal, at least two side members and two cross member having frame from the plane of the mast projects upwards, from the top End of the mast are stretched from tensioning cables to frame parts. Furthermore, the feature is adopted by the AT 501895 A4 that below the foot of the mast Rod - which can optionally be used as a sword carrier - protrudes below the plane of the frame and that from this rod tensioning cables are stretched obliquely upwards to frame parts.

As the most essential improvement according to the invention, the combination of the following features is proposed:

- The connection between the mast and the projecting from its base down rod is made rigid, so that the mast and the said downwardly projecting rod form a common rigid rod, which projects from below the plane of the frame to far above the plane of the frame ,

- The inflatable hulls are used in addition to their well-known function as a floating body as a side member of the frame. For this purpose, the front and the rear cross member are supported by introduction of force directly into the inflatable hulls, however, that they slide according to the force exerted by the tensioning cables to each other.

Surprisingly, the inflatable hulls are quite able to absorb sufficiently large compressive forces in the longitudinal direction and also withstand all bending moments occurring sufficiently well to be able to perceive the function of side members and thus to be able to replace separate side members. This can be compared to construction methods according to the prior art longitudinal beams are formed in addition to the inflatable hulls as separate parts, completely saved. This reduces weight, manufacturing costs, and pack size (with empty inflatable hulls).

By the downwardly projecting rod-like extension from the base of the mast - unlike in prior art constructions - is rigidly connected to the mast, the mast and downwardly projecting extension commonly formed rigid bar alone by tension cables, which attack at the lower and upper end of this rod and lead up or down to points on the frame of the sailing catamaran, are fixed relative to the frame of the sailing catamaran. So it is no longer necessary that the mast directly to a rigid frame part (as typically a cross member) is applied. The position of the foot of the mast is thus no longer directly dependent on the position of a cross member. Thus, it can be better optimized so that operability and sail area utilization are optimal. In fact, it is advantageous and easily realized by the construction according to the invention, to arrange the mast between the front and the rear cross member at a distance to both crossbeams.

That is, in an advantageous and easily realizable by the inventive design variant, the axis of the mast intersects the plane of the frame of the sailing catamaran between the two cross members of the frame at a distance to both cross members.

Thus, the mast - compared with prior art constructions - can be positioned relatively far back, so that the person using the sailing catamaran can comfortably rest on the mast base against lateral slippage and so that a very large headsail can be used.

In a particularly preferred further development of the invention, no mainsail is used, but only a headsail. By optimizable for the headsail arrangement of the mast (far back) can thus be achieved in a construction that is particularly easy to manufacture, assemble and operate, a very dynamic sailing behavior can be achieved. A headsail has - in contrast to a main sail - even with the simplest version - a trouble-free leading edge, is very cheap to manufacture and is easy to roll. The fact that it is easy to roll in means that it can be rolled up easily and quickly, so that the entire sail area can be "disappeared" in seconds, which in addition to comfort gain in strong wind and a - for beginners particularly important - significant safety gain.

In a further particularly preferred further development of the invention, the sword of the sailing catamaran is arranged directly on the extension of the mast downwards.

The sword is an approximately vertically projecting down into the water part, which is shaped like an airfoil-like, wherein the longer dimension of the cross-sectional area is aligned parallel to the longitudinal direction of the sailing catamaran. The sword serves to prop up the sailing catamaran against the wind Sail applied side forces slides sideways. By said arrangement it is achieved that in addition to the tensioning cables required for holding the mast in any case no further parts for holding the sword relative to the frame must be used. Even the sword does not need to be connected by rigid parts with the frame.

The construction is thus further simpler and less weight. During the test, it was found that the design also provides intuitively easy to understand operability.

The invention, including further advantageous developments - which are in part also independent of the features already described - inventive new and advantageous - illustrated by slightly stylized, not to scale drawings:

Fig. 1: shows an exemplary sailing catamaran invention in side sectional view.

Fig. 2: shows the sailing catamaran of Fig. 1 is a more detailed sectional view of a portion of the cross-sectional area of the two hulls and the attachments located there in that longitudinal region of the fuselage to which the rear cross member is fixed to the hull. The viewing direction is to the rear.

Fig. 3: shows the sailing catamaran of Fig. 1 is a more detailed lateral sectional view of the rear cross member and adjacent parts.

Fig. 4: shows the sailing catamaran of Fig. 1 is a more detailed view from above on the central region of the front cross member.

Fig. 5: shows the sailing catamaran of Fig. 1 is a more detailed side view of the connection area between the mast and the sword, the sword is in an intermediate state between the operating position and folded position.

In the sectional view according to FIG. 1, the cutting plane is vertical, parallel to the longitudinal direction of the sailing catamaran in front of the middle of the width of the sailing catamaran, so that therefore the mast 3, which is arranged symmetrically between the two hulls 1, is visible. The direction of travel is in the illustration of FIG. 1 to the right.

The hulls 1 are made of a dense, sheet-like flexible material, such as typically a fabric-reinforced rubber film. They have the shape of a at the ends tapered slender circular cylinder and are aligned parallel to each other in the intended direction of travel at a distance from each other. The two hulls 1 are connected by a front cross member 2.1 and a rear cross member 2.2, which are aligned horizontally, normal to the direction of travel and rest on the upper side of the hulls 1.

Between the two cross members 2.1, 2.2, which are typically each substantially an aluminum round tube, the so-called trampoline 9 is stretched. The trampoline is the main habitat for the persons using the sailing catamaran. Typically, the trampoline consists of a strong but elastically extensible tissue.

Approximately in its center of area, the trampoline 9 has an opening through which the mast 3 or its straight extension 8 projects downwards. The top of the mast 3 is connected by tensioned ropes with the rest of the sailing catamarans. Two ropes, the so-called shrouds 7, connect the mast tip with one end of the rear cross member 2.2. The third rope, the so-called forestay 6, connects the top of the mast with the front tip of the so-called bowsprit 13, a stiff rod-shaped part which projects approximately horizontally forward over the front cross member 2.1 in the middle of the width of the sailing catamaran.

The mast 3 has a lower extension 8 with which it forms a rigid rod together, which intersects the plane defined by the cross member 2.1, 2.2 plane of the frame of the sailing catamaran and thus also intersects the plane of the trampoline 9. In the advantageous construction shown, the sword 4 is attached to the lower part of the extension 8. The extension 8 thus forms the swordtail.

At the lower end of the extension, ideally just below that height range at which the water level is calmly lying in the water sailing catamaran, four guy ropes 5 are attached to the extension 8 of the mast 3, which are under tension and with their other ends at the ends the two cross beams 2.1, 2.2 are attached.

The advantageous sailing catamaran shown has only a foresail 10 and not as usual sailing catamarans and a mainsail. The (as is known) triangular foresail 10 is guided on forestay 6, so with one of its edge lines continuously on Forestay 6 anchored. At the not adjacent to the forestay 6 corner of the head sail 10, the so-called sheet 15 is attached, which is a leash which serves to operate the foresail 10, so to adjust its position. The sheet 15 is an endless line, which runs around two deflection rollers, the so-called sheet pile points 11 and around the front outer surface side of the mast 3. The two sheet-pile points 11 are each arranged at a rear longitudinal end of a hull 1. The connection of the sheet 15 with the headsail 10 is located at that longitudinal region of the sheet 15, which extends around the mast 3 around between the two sheet-Holepunkte.

In the illustrated advantageous construction, the sheet pile points 1, behind the rear cross member 2.2 are arranged and anchored directly to a hull 1. Compared to the usual construction, in which the sheet-Holepunkte are attached to the end of the rear cross member, thus a better sail utilization, a favorable draft angle on the headsail 10 and a larger sail area possible. The, the sheet pile points 11 forming, mounted in an open housing pulleys are typically attached by means of glued tabs on the hulls 1.

The above-mentioned rapid rolling of the headsail 10 is - as known per se - performed by the forestay 6, along which the headsail 10 extends with an edge, is rotated about its longitudinal direction. This turning is - as is well known - with the help of a roll attached to the forestay and a line attached to it very quickly feasible.

At the longitudinal center of the rear cross member 2.2, the rudder 12 is attached. This is an elongated, about wing-like looking part, which projects vertically into the water in operation and about its then vertical longitudinal axis is pivotable, so that the longitudinal direction of its cross-sectional area relative to the longitudinal direction of the sailing catamaran can be pivoted, with which the sailing catamaran can be steered.

FIG. 2 and FIG. 3 serve above all to illustrate an advantageous fastening method for a cross member 2.1, 2.2 on a hull 1. The connection of the right rear cross member 2.2 to a hull 1 is shown by way of example.

The rear cross member 2.2 is essentially a round tube. At its end several vertical downwardly projecting support tabs are welded 2.2.1, which ends with their lower ends to a support part 2.2.2 and are welded to it. The support part is adapted to the curvature of the surface of the fuselage 1 is that is approximately part-circular, wherein the axis of the pitch circle is aligned parallel to the longitudinal axis of the sailing catamaran and the inner radius of the pitch circle corresponds approximately to the radius of the fuselage 1. From the support part 2.2.2 area projections 2.2.3 protrude forward, ie in the direction of the front cross member 2.1, wherein the surface of these extensions 2.2.3 is aligned approximately parallel to the adjacent surface of the hull 1. To the hull 1 a film layer 1.1 is glued, which includes 1 cavities with the hull, which are open to the rear of the hull 1 out. In the mounted position, the extensions 2.2.3 rigidly connected to the cross member are inserted into said cavities until the support tabs 2.2.1 bear against the film layer 1.1 in the area of the cavern openings and are thereby held against further sliding in the direction of the front cross member 2.1. The sheet material of the film layer 1.1 may be the same material from which the hull 1 is made. Instead of a flexible film layer 1.1 could also be used for a layer of a rigid material.

A support tab 2.2.1, preferably that which is positioned facing the longitudinal axis of the sailing catamaran, forms the transverse-beam-side anchoring point of a tensioning cable 5 which leads from the lower end of the extension 8 (Figure 1) to one end of the crossbeam 2.2.

The - not shown - anchoring of the front cross member 2.1 on the fuselage 1 is approximately mirror image for anchoring the rear cross member 2.2 formed on the hull 1. Protruding with the front cross member 2.1 rigidly connected extensions backwards (toward the rear cross member) in the openings of forwardly open cavities between an additional film layer and the fuselage. 1

A Wante 7 is anchored to a small plate 2.2.4, which is welded to the front side of the rear cross member 2.2 and away from something protrudes forward. By the Wante 7 is anchored to the protruding from the rear cross member 2.2 forward part of the plate 2.2.4 (Fig. 3) is achieved that the cross member 2.2 with respect to rotation about its own longitudinal axis despite the pulling action of the trampoline 9 and the tension cables. 5 optimally aligned, namely such that the extensions 2.2.3 are aligned parallel to the longitudinal direction of the sailing catamaran. Thus, despite the relative softness of the inflatable hull 1 a very well-defined and rigid support of the cross member 2.2 is achieved. In the advantageous embodiment shown in the drawings, the sailing catamaran has a bowsprit 13, at the front tip intended the forestay 6 is anchored. (Figure 1) In a simplified - but not dynamic and with respect to the possible size of the sail area not so advantageous - execution of a sailing catamaran invention can dispense with the bowsprit and instead anchor the forestay 6 at the longitudinal center of the front cross member 2.1. The anchoring should then be carried out eccentrically with respect to the longitudinal axis of the front cross member 2.1 analogous to the described anchoring of the shrouds on the rear cross member, namely so that the forestay 6 between the longitudinal axis of the front cross member 2.1 and the mast 3 engages the front cross member 2.1.

From Fig. 1 and Fig. 4, an advantageous embodiment and anchoring possibility for the bowsprit 13 can be seen.

The executed essentially as a round bow bowsprit 13 protrudes from the foot of the mast 3 from the front cross member 2.1 also forward. At the mast end, the bowsprit is welded to a pipe section 13.1 (FIG. 1) which, in the mounted state, is aligned coaxially with the mast 3 and comprises the lateral surface of the lower part of the mast 3 and of the upper part of the extension 8.

Fig. 4 shows the connection region between bowsprit 13 and front cross member 2.1. At that longitudinal region, with which the bowsprit 13 crosses the front cross member 2.1, two plates 13.2, 13.3 are welded onto the bowsprit 13. The plane of the sheet 13.2 is aligned substantially normal to the bowsprit 13. It has two in the parallel to the bowsprit 13 bent extensions 13.2.1, which lie adjacent to each other at the same height transversely to the longitudinal direction of the bowsprit at a significant distance and protrude when assembled Segelkatamaran in each case a recess on the front cross member 2.1 from the front of the sailing catamaran ago. On the mast 3 facing lateral surface side of the front cross member 2.1 is a triangular plate 2.1.1 radially projecting from the cross member 2.1 welded so that its side facing away from the cross member 2.1 aligned tip abuts the upper lateral surface side of under the cross member 2.1 extending bowsprit. Said tip protrudes between the two legs of a U-shaped holding part 13.3, which is welded to the lateral surface of the bowsprit 13. The legs of the U-shaped holding part 13.3 are parallel to the longitudinal direction of the bowsprit 13 extended. directed. Between these legs, the tip of the triangular plate 2.1.1 is held against horizontal relative movement normal to the longitudinal direction of the bowsprit 13.

By the discussed, outlined in Fig. 4 connection between bowsprit 3 and front cross member 2.1, these two parts are well fixed to each other against relative movement in the plane together spanned. The connection is quickly and easily without tools produced or solvable when building or when folding the sailing catamaran.

In contrast, the connection is, in particular, a stiff blockade in that the bowsprit 13 is rotated about its own longitudinal axis relative to the front cross member 2.1. In conjunction with the pipe section 13.1, which includes the foot of the mast 3, it is achieved that with a lateral inclination of the mast 3 - as it occurs from strong wind forces - the front cross member 2.1 is turned much better than he without it Connection would be over the bowsprit 13.

Due to this rigid torque transmission between mast 3 and front cross member 2.1 on the bowsprit 13, the sailing catamaran is with respect to elastic deformations by sail and sword forces at comparatively low weight extremely much stiffer than he would without this connection on the bowsprit between mast and front cross member. Thus, the sailing catamaran is not only better controllable but it is also easily the so-called Einkufenfahrt allows, namely those driving in which the sailing catamaran strong lateral sail forces is inclined so that the windward hull is lifted out of the water. The possibility of Einkufenfahrt is by no means a matter of course for sailing catamarans with inflatable hulls.

The described, sketched in Fig. 4 connection between bowsprit 13 and front cross member 2.1 is only to be seen as an exemplary connection by means of which the Abstützung between mast 3 and front cross member 2.1 against torques to the longitudinal direction of the Segelkatamarans parallel axes is reached. In addition, there are many other possible connections between bowsprit 13 and front cross member 2.1 in the context of professional action with the required support effect can be achieved.

The described embodiment of the connection between mast 3 and front cross member 2.1 on the loaded as a torsion bar bowsprit 13 is according to the invention Sailing catamarans without separate - not formed by the inflatable hulls - side rails particularly valuable because they tend not to be as stiff as if they had separate side members made of a rigid material. But it is also for conventionally built sailing catamarans, even for those with rigid rather than inflatable hulls, very beneficial.

Fig. 5 shows, among other parts, protruding under the trampoline extension 8 of the mast 3. The extension 8 is a rigid straight extension of the mast 3 and with this - however rigidly connected. The extension 8 is designed as a square square tube. At its lower end, which protrudes just below the water when sailing catamaran standing in the water is a plate 8.1 attached to which the leading to the ends of the cross member 2.1, 2.2 guy ropes 5 are attached.

In the illustrated embodiment, the sword 4 is attached to the extension 8 as a further extension thereof down. In the normal operating state, the sword 4 is connected via the extension 8 a straight extension of the mast 3 downwards and rigidly connected to the mast 3.

In the illustrated particularly advantageous embodiment, the sword 4 relative to the extension 8 about a horizontal, aligned transversely to the longitudinal direction of the sailing catamaran axis from its operating position herausschwenkbar when either a large force from the front presses against the sword (which is the case when you driving forwards the sword against a shoal) or when a holding mechanism is unlocked.

From the upper part of the sword 4 projects with this rigidly connected stem 4.2 upwards. The stem 4.2 is a square profile whose cross-sectional area between two opposite cross-sectional areas of the formed as a hollow profile extension 8 takes place. In the operating state of the stem 4.2 and the extension 8 are aligned the same, overlapping in a longitudinal region and the cross-sectional area of the stem 4.2 between the two lateral lateral surface sides of the extension 8 is arranged. At that longitudinal region of the extension 8, which overlaps with the stem 4.2, the front and the rear lateral surface side of the extension are removed in sections. Above the sword 4 extends the horizontal, transversely to the longitudinal direction of the sailing catamaran aligned pivot axis about which the sword 4 opposite the mast 3 and the extension 8 is pivotally through the stem 4.2 and the remaining lateral surfaces of the extension 8. To the back of the sailing catamarans towards the slide 8.1 is executed slotted so that it does not collide with the sword 4 when the sword 4 is brought into operating position ,

Above the stem 4.2, a two-armed lever 14 is pivotally mounted on the extension 8, wherein also in this case, the pivot axis is aligned horizontally transversely to the longitudinal direction of the sailing catamaran. The rear arm of the lever 14 is pulled up by a tension spring 14.1, so that the front arm of the lever 14 is pivoted downward. The upper part of the stem 4.2 protrudes into the pivoting range of the front arm of the lever 14. Upon pivotal movement of the stem 4.2, the front arm of the lever 14 slides at the top of the stem and snaps into its front edge.

If the sword 4 hits an obstacle during the forward travel of the catamaran, a strong torque is caused on the rod 4, which is rigidly connected to the sword 4, which provides a strong horizontally aligned pressure force from the stem 4.2 to the point of contact on the lever 14 with the stem 4.2 Episode has. Since this contact point is lower than the axis of rotation of the lever 14, the lever 14 is pivoted so that the latching with the stem 4.2 is released and thus rotational movement of the sword 4 is released. The sword can thus swing upwards and is not damaged by the obstacle.

Just below the pivot point of the stem 4.2 engages the rear of the stem 4.2 an upwardly pulling tension spring 4.3, which rotates in the absence of other forces or torques the stem 4.2 and thus the sword in the folded-back position.

A leash 4.4, which leads from the upper end of the stem to the back of the extension and there up to beyond the trampoline, serves the stem 4.2 and thus the sword 4 away from the raised position, against the momentary effect of the spring 4.3 in the to bring vertical operating position by pulling on the leash 4.4.

The anchoring described is not only safe and comfortable, it causes in the closed state (with sword located in operating state 4) and a play-free mounting of the sword. 4 The front upper part 4.1 of the sword 4 is not rigidly connected to the stem 4.2, but with the extension 8. When the sword 4 is in the operating position, it rests against the part 4.1, so that the two parts together the outer shape of a conventional monolithic have executed sword. Through this split version of the sword 4 ensures that the extension 8 can reach well below the water level and yet up to the water level reaching sword can be used. By the extension 8 projects deep down, the tension cables 5 can be relatively far below the defined by the cross member 2.1, 2.2 frame plane of the sailing catamaran - which is very advantageous statically.

The described embodiment of the sword attachment is particularly valuable for the present inventive design of sailing catamarans, as these sailing catamarans especially offer because of their ease and cost-effectiveness for beginners and because it is very easy to use and security against damage is very important. However, the described sword attachment is also on "custom built" sailing catamarans a valuable improvement over known sword attachments.

Claims

claims

1. Segelkatamaran which two inflatable hulls (1) made of a flexible sheet material, and extending in a horizontal plane frame, which has a front cross member (2.1) and a rear cross member (2.2), and two, these cross members interconnecting Side members, wherein on the frame a mast (3), a trampoline (9), a sword (4) and a rudder (12) are fixed, wherein from the base of the mast (3) from a straight extension (8) below the plane of the frame protrudes, from the lower region of the extension (8) of tensioning cables (5) are stretched obliquely upwards to frame parts and being stretched from the upper part of the mast (3) of ropes to frame parts,

characterized in that

the two longitudinal members of the frame are formed by the two inflatable hulls (1) and that the mast (3) and from the base of the mast (3) downwardly projecting extension (8) are rigidly interconnected.

2. Segelkatamaran according to claim 1, characterized in that the mast (3) and extension (8) together formed rod the plane of the frame between the two cross members (2.1, 2.2) at a distance from the two cross members (2.1, 2.2) penetrates.

3. sailing catamaran according to claim 2, characterized in that a headsail (10) sole sail of the sailing catamaran.

4. Segelkatamaran according to one of claims 1 to 3, characterized in that it comprises a headsail (10) which is operable with a sheet (15) which is guided over sheet-Holepunkte (11) behind the rear cross member (2.2 ) are each attached to an inflatable hull (1).

5. sailing catamaran according to one of claims 1 to 4, characterized in that the sword (4) connects below to the extension (8) and in the operating state is rigidly connected to the extension (8).

6. sailing catamaran according to one of claims 1 to 5, characterized in that in each case a Wante (7) between the top of the mast (3) and in each case an end region of the rear cross member (2.2) extends.

7. sailing catamaran according to one of claims 1 to 6, characterized in that the cross members (2.1, 2.2) have two-dimensional extensions (2.2.3), which abut the hulls (1), wherein the two-dimensional extensions (2.2.3) of the longitudinal side of the fuselage (1) facing away from the mast (3) protrude into cavities which extend between the hulls (1) and layers (1 .1) connected thereto and that the connecting points of the shrouds (7) to the rear crossmember (7). 2.2) are further forward than the longitudinal axis of the rear cross member.

8. Segelkatamaran according to one of claims 1 to 7, characterized in that a bowsprit (13) from the mast (3) extends forward beyond the front cross member (2.1) addition and that the bowsprit (13) on the mast (3 ) and on the cross member (2.1) is supported against relative rotation to these parts about the longitudinal axis of the bowsprit (13).

9. sailing catamaran according to one of claims 1 to 8, characterized in that the sword (4) is designed in two parts, wherein a part (4.1) with the extension (8) is rigidly connected and the rest of the sword (4) on the extension (8) is pivotally supported, wherein the pivot axis is aligned horizontally normal to the longitudinal direction of the catamaran and wherein the pivoting is determined by a releasable latching connection.