DE3237270A1 - Highly efficient course-stabilising fin for kayaks - Google Patents

Abstract

The invention relates to a highly efficient course-stabilising fin for kayaks, in which the fin blade can be lifted out of the water during travel or immersed to varying depths and can overshoot upon coming in contact with an obstacle. The fin blade plunges by its own weight or by spring force roughly perpendicularly into the water and, on account of the fluid-dynamic pressure balance at the bottom edge, has the shape of a narrow, upright rectangle and plunges substantially deeper into the water than the hull of the boat.

Description

Course stabilizing fin with good efficiency

for kayak boats The invention relates to a course-stabilizing fin with a good degree of efficiency for kayak boats with which the / during the trip the fin blade can be lifted out of the water and swings when it comes into contact with an obstacle.

It is known that kayak boats due to their round underwater hull, Especially the white water kayaks because of their compact shape, on quiet or standing waters tend to "spin". That means that they are extremely out of course to run. Even the "Eskimo kayaks" designed for standing, with their extreme Long and slender hulls run without corrective action even in absolutely calm water Paddle strokes strongly out of course. Especially in heavy swell when the Wave crests run sideways into the course, the kayak boats are only through exhausting, to keep constant paddling strokes on course. Especially when the crest of the waves is higher obliquely or lengthways from behind. Running in the course, the kayak boats are handy can no longer be kept on course because the aft ship, which is deeper in the water, of The waves are pushed aside and the kayak is turned.

In order to give the kayak boats better course stability, mainly the "Eskimo kayaks" designed for large and stagnant waters afterwards with Keel extensions or rigid, flat stabilizing fins provided, which They served their purpose well enough, but the kayaks did most of them Took maneuverability. These retrofitted kayaks were then on fast-moving ones and smaller bodies of water can no longer be used, for which especially the more agile "white water kayaks" are tailored. To eliminate these disadvantages, rudder retrofit kits are available offered, which are, however, very complex to retrofit and accordingly expensive are. These rudders are kept very wide and only plunge very shallowly Water to avoid hitting the ground as much as possible. Because of the fluiddsnamic Pressure equalization on the long lower edge - with the rudder turned across to the lower edge - the degree of efficiency to the immersed surface is low. In particular in higher waves, where the rudder would be particularly necessary, it will with the stern of the boat lifted largely or completely out of the water by the waves and is ineffective during this time.

The invention is based on the object for kayaking.

boats a simple stabilizing fin with good efficiency like this to train that this for the navigation of standing or large bodies of water with Can be attached to the kayak boat in a few simple steps and for negotiating tight curves or Can be lifted out of the water with one hand for mooring and casting off maneuvers while driving is and remains largely effective even in heavy swell.

An advantageous experience is shown in FIGS. 1 and? shown.

Figure 1 shows the rear part of a kayak boat with an attached Fin and an advantageous guidance of the operating line.

FIG. 2 shows a cross section through the bearing block and the suspension the fin on the stern of a kayak boat.

This object is achieved in that the thin-walled Fin blade 1 is mounted on a fork 21, 22 on an axis 3, which is free rotatable and displaceable in one on the stern of the kayak boat transversely to its longitudinal axis and horizontally mounted bearing block 4 is seated. The fork 21, 22 is made up of two individual ones formed angled arms, a shorter arm 21 and a longer arm 22, which at the upper end of the fin blade 1 with with / are riveted together sem. The fork 21, 22 is advantageously designed so that the fin blade 1 by its own weight dips approximately vertically into the water, because of the fluid dynamic pressure equalization at the / 18 lower edge this is listed relatively briefly, so that the fin blade 1 advantageously forms a narrow, raised rectangle and much deeper than the hull plunges into the water. The beneficial ones Measure of the immersed area of the fin blade 1 for kayak boats from approx. 4 to 5 Meters in length are approx. 25 x 12 centimeters. Both fork arms 21, 22 are between two thrust washers 5 mounted on the axis 3, which at both ends with the help of Spring wire brackets 6 are axially fixed via the tube 17 firmly connected to the bearing block 4 are. This is advantageous with threaded blind rivets and screws on the upper deck unscrewed shortly before the end of the stern and can be used when not in use easily removed. At the free end of the fork arm 22 is a snap hook 14 a line 16 is attached, which advantageously on the from the front stem to the stern stem of the eagle boat stretched coaming line 7 in rings 8 to within good reach of the Is guided by the driver. The free end of the leash 16 can advantageously be fitted with a snap hook 13 hung in the rings 9, 10, 11, 12 attached to the coaming line 7 will. By pulling on the leash 16, the fin blade 1 can be wholly or partially can be lifted out of the water and hooked into the rings with the snap hook 13 10, 11, 12 can be fixed against deeper immersion. This is how the immersion depth of the Fin blade 1 adapted for shallow water.

Receives the fin blade 1 because of its greater draft the hull unexpectedly eats up basic food or otherwise hits an obstacle, so it can swing fully to the rear and to the front as far as the hull allows it of the respective kayak boat allows, with the line 16 and stretch the coaming line 7 elastically.

When the bearing block 4 is about its vertical center axis on the stern stem rotatably supported 'is the device described above with corresponding Operating elements also suitable as rudders.

If the stern of the kayak already has a transverse hole, so it can accommodate the tube 17 and the axle 3 in an adapted manner instead of the bearing block 4.

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Claims (9)

Course stabilizing fin with good efficiency for kayak boats. Patent claims 1. Course stabilizing fin with good efficiency for Sajak boats, characterized in that that the fin blade 1 can be lifted out of the water while driving. 2. Apparatus according to claim 1, characterized in that the fin blade 1 is immersed in the water by its own weight. 3. Apparatus according to claim 1, characterized in that the fin blade 1 is kept in an optimal position in the water by spring force. 4. Device according to one of claims 1 to 3, characterized in that that the fin blade 1 can swing through. 5. Device according to one of the preceding claims, characterized in that that the fin 1, 21, 22, 3, 5, 6 can be removed in a few simple steps. 6. Device according to one of the preceding claims, characterized in that that the bearing block 4 can be removed and reattached in a few simple steps. 7. Device according to one of the preceding claims, characterized in that that of the fin blade 1 in fully immersed as a still set, sclimales and thin-walled Rectangle is formed. 8. Device according to one of the preceding claims, characterized in that that the fin blade 1 can dip much deeper into the water than the hull. 9. Device according to one of the preceding claims, characterized in that that the fin blade 1 can dip much deeper into the water than it is wide is. 1C. Device according to one of the preceding claims, characterized in that - that the fin blade 1 varies with one handle during the journey can be immersed in the water.