DE8801579U1 - Windsurf board - Google Patents

Description

Hans Fichtner, Weilheimer Str. 22, D-8124 Seeshaupt Windsurf board

The invention relates to a windsurfing board with a mast that is mounted on a deck in a receptacle so that it can rotate and pivot, and with an underwater hull, whereby the outer contour of the windsurfing board is defined by the transition from deck to underwater hull, and whereby foot straps are provided on the deck.

Such windsurfing boards are well known in a wide variety of designs and sizes. ObIi-

J ₀ ncertainly, such well-known windsurfing boards

an outer contour that is similar to the shape of a ship's hull or a conventional surfboard. In the pursuit of ever greater speeds, such windsurfing boards have been built ever smaller and narrower in recent years, so that they can only float through dynamic buoyancy. Such extremely narrow boards are also hardly usable by the average athlete. All known windsurfing boards experience

3Q speed problems arise due to the flow separation at the fin and underwater hull, which leads to a sudden breakaway of the windsurfing board and an inevitable fall. These problems are referred to in the relevant professional world as "spin out".

The invention is based on the task of developing a completely

to propose a new type of windsurfing board of the type defined above, which solves the problems mentioned above.

reports or at least reduces it and which, apart from the higher speeds that can be achieved, is also suitable for average athletes. &

This object is achieved according to the invention in a wind-thrown board of the type defined at the beginning in that the outer contour is provided with a tail-like, continuous narrowing and that the narrowest point of the vernauna is arranged between the stern and the mast mount. Practical tests have shown that considerably higher speeds can be achieved through this special shape of the outer contour, and beyond this, the occurrence of a spin-out was not detectable.

In a particularly preferred embodiment according to the invention, the narrowest point of the constriction is located within the rear half of the total length of the windsurfing board.

In detail, the invention can be further developed by the narrowing of the outer contour merging into a plate-like widened rear section. In this embodiment, it has been shown that once certain speeds are reached, the windsurfing board only glides on the rear section, so that the wetted surface of the underwater hull is considerably reduced and high speeds can thus be achieved.

It is particularly preferred that a foot loop is provided at least on this rear section.

In a particularly preferred embodiment according to the invention, the underwater hull is formed in the region of the constriction in the form of a concave groove with comparatively sharp side edges.

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The sharp side edges preferably transition to the bow into outward and upward inclined bevels, whereby the underwater hull is also formed like a cove in the bow area.

In this design, it is preferred that the underwater hull is flat in the plate-like stern section and that the sharp side edges also merge into sloping surfaces that slope upwards and outwards. This design offers the advantage _that the edge guidance of the underwater hull by the sharp edges in the narrowing area is only present in a partial area, while the sloping surfaces in the bow area ensure that the board starts to plan early. The flat underwater hull in the stern section area ensures good gliding properties of the windsurfing board.

In particular, it is preferred that the stern section has a smaller width than the bow section.

In a particularly preferred embodiment of the invention, the bow section is designed to be large and have a greater height than the stern section. This embodiment can not only be used with short so-called fun boards, but also offers advantages with longer windsurfing boards, since the large-volume bow area ensures that the windsurfing board floats even at lower speeds, so that overall it is easier to handle.

In a modified embodiment according to the s>f j_ dung, a stringer is provided that runs the entire length of the windsurfing board and is arranged in the center axis, around whose axis the stern section can be rotated relative to the bow section. This rotation can

for example, using the foot loop provided in the rear section.

Overall, it is expected that the narrowing between the bow and stern sections will result in a certain twisting or twisting between the bow and stern sections when making tight turns, which - as practice has shown - makes the windsurfing board much more maneuverable and also helps prevent spin-outs.

The invention is explained in more detail below using an embodiment illustrated by way of example in the drawings. It shows:

Figure 1 is a schematic plan view of an embodiment of the windsurfing board according to the invention;

Figure 2 is a side view of the windsurfing board according to ^{Figure 1} *

Figure 3 is a sectional view along the line III-III of Figure 2;

Figure 4 is a sectional view along the line IV-IV of Figure 2 and

Figure 5 is a sectional view along the line V-V of Figure 2.

As shown in the schematic drawings, the

Windsurf board 1 has a deck 2, in which a holder 3 is attached for holding a rotating and pivoting mast. In the illustrated embodiment, the holder 3 is shown as an outer fin box.

The transition between the area formed by deck 2

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surface and the surface of the underwater hull 4 defines the outer contour 5 of the windsurfing board. Foot straps 6 are also attached to the deck 2 at suitable points. 5

As shown, the outer contour 5 is formed with a waist-like continuous constriction 7, wherein the narrowest point of the constriction 7, illustrated by the arrow 8, is arranged between the stern 9 and the mast holder 3.

If the total length of the windsurfing board 1 extending between the stern 9 and the bow 10 is divided into two equal halves, the narrowest point 8 of the constriction 7 lies within the rear half of the total length.

As shown, the constriction 7 of the outer contour 5 merges in the direction of the rear 9 into a plate-like widened rear section 11, on which at least one foot loop 6 is provided.

As can be seen from the sectional views of Figures 3 to 5, the underwater hull 4 is designed in the area of the constriction 7 in the form of a groove 12, which forms comparatively sharp edges 13, 14.

The sharp side edges 13, 14 merge in the direction of the bow, as can best be seen from a comparison of Figures 3 and 4, into outward and upward inclined surfaces 15, 16, whereby the hollow groove 12 continues into the underwater hull 4 within the inclined surfaces 15, 16.

As can be seen from the comparison of Figure 4 and Figure 5, the underwater hull is flat in the plate-like stern section 11, i.e. with a flat bottom 21. In the area of the stern section

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11 the sharp side edges 13, 14 in the region of the constriction 7 also merge into upwardly and outwardly inclined surfaces 17, 18.
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As can be seen from Figure 1, the stern section 11 has a slightly smaller width than the bow section 19.

As can be seen from Figure 2, the bow section 19 is larger in volume than the stern section 11 and the constriction 7 and has a greater height than the entire stern area.

As can also be seen from the drawings, a stringer 20 is provided that runs along the entire length of the windsurfing board 1 and is arranged in the central axis. In practice, this makes it possible to use it as a rotation axis if necessary in order to deliberately rotate the stern section 11 relative to the bow section 19 during certain maneuvers.

All features and advantages of the invention arising from the description, claims and drawings, including structural details and spatial arrangements, can be essential to the invention either individually or in any combination.

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Claims (11)

Patent2n\y§fte Dip!. Ing. Ksri A. Broee t CHpI. Ing. D. Karl Brose D-8023 Pullach/Müncten Wtaner8tr.2,7(^089/7935071-72 D-8023 Pullach, 08. February 1988 DBr-au Hans Fichtner, Weilheimer Str. 22, D-8124 Seeshaupt PROTECTION CLAIMS 16 1. Windsurfing board with a mast mounted on a deck in a rotatable and pivotable manner in its holder and with an underwater hull, the outer contour of the windsurfing board being defined by the transition from the deck to the underwater hull and foot straps being provided on the deck, characterized in that the outer contour (5) is provided with a waist-like continuous narrowing (7) and that the narrowest point (8) of the narrowing (7) is arranged between the stern (9) and the mast holder (3). 2. Windsurfing board according to claim 1, characterized in that the narrowest point (8) of the constriction (7) lies within the rear half of the total length of the windsurfing board (1). 3. Windsurfing board according to claim 1 or 2, characterized in that the constriction (7) of the outer contour (5) merges into a plate-like widened rear section (11). 4. Windsurfing board according to claim 3, characterized in that a foot strap (6) is provided at least on the rear section (1t). 5. Windsurfing board according to one of the preceding claims, characterized in that the underwater hull (4) in the region of the constriction (7) is formed in the manner of a concave groove with comparatively sharp side edges (13, 14). 6. Windsurfing board according to claim 5, characterized in that the sharp side edges run outwards and upwards towards the bow (10), with the underwater hull (4) also being formed in the form of a concave groove in the bow section (19). 7. Windsurfing board according to one of claims 3 to 6, characterized in that the underwater hull (4) is flat in the plate-like rear section (11). 8. Windsurfing board according to one of claims 5 to 7, characterized in that the sharp side edges (13, 14) in the rear section (11) merge into upwardly and outwardly inclined surfaces (17, 18). 9. Windsurfing board according to one of the preceding claims, characterized in that the rear section (11) has a smaller width than the bow section (19). 10. Windsurfing board according to one of the preceding claims, characterized in that the bow section (19) is designed to be large-volume with a greater height than the stern section (11). 11. Windsurfing board according to one of the preceding claims, characterized in that a «I Il of the windsurfing board (1) and arranged in the central axis stringer (20) is provided, around the axis of which the stern section (11) can be rotated relative to the bow section (19) B.