JP2008189115A - Paddle for kayak - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contrive an Aleut Greenland type paddle so that everyone may easily obtain sufficient propulsive force since the paddle requires skillfulness to obtain the propulsive force because the paddle has narrow blade area and has a different general rowing method, while the paddle has many advantages such as the thinness having excellent portability as a reserve paddle. <P>SOLUTION: The shape of the Aleut paddle is contrived, and is formed into a flap shape by elongating the height of an upper side of the blade. By shortening the height of a lower side, the paddle is formed into a shape provided with a slot on a lower side on an advancing direction side of the rear face. A paddle shaft is offset to a rower side on a rear side. As a result, force of the rower is prevented from being damped in the role since the force is excessively put into the flap part, and much more front water can be moved to a rear side by efficiently utilizing lift. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a shape for padding paddles used in kayaks, particularly sea kayaks, in an easy and efficient manner.

        Kayak paddles, as shown in Figure 1, have been used for a long time, such as the Aruto-type paddles and Greenland-type paddles. It is roughly divided into a feather paddle to which the blade is bonded.

These paddles are divided differently. In particular, the Aruute Greenland type paddle has a narrow blade width, so as shown in Fig. 2, the blade must be tilted 45-60 degrees rather than perpendicular to the surface of the water and pulled to the rear of the rower. I can't get it. The water pressure on the puller side rises, and the water pressure on the traveling direction side decreases, so the water in the front is drawn in.In other words, the Arute Greenland type paddle obtains propulsive force using the lift indicated in Bernoulli's theorem and wing theory Is.
[Patent Document 1] Japanese Patent Application Laid-Open No. 8-126720 Shinji Suzuki “Airplane Story” Chuo Koron Shinsha 2003 pages 117-127

In the present invention, by devising the blade shape of an altitude paddle having a narrow blade, the aim was to obtain a large lift with a smaller force of the rower and use it as a propulsion force, and anyone can easily raise it.

In order to paddle with the same level of propulsive force as a modern feather paddle, the altitude Greenland type paddle with a narrow blade width, stabs the blade at an angle of 45 to 60 degrees to the surface and kayaks the pusher The puller must be moved to about 170 degrees behind the rower. If the blade angle is wrong, it will not proceed. On the other hand, in modern feather paddles, the blade inserted into the surface of the water can be pulled to the side of the rower. In this way, skillfulness is required to master the Arute Greenland type paddle.
2

In an Alute type paddle where the paddle blade shaft is bent in a mountain shape, the paddle shaft (symbol 1) is placed on the rear and rower side (symbol 2): forward in order to install the shaft position in front of the blade width center. -It is set as the structure installed in the position of 8: 77-30: 55 by the ratio of the advancing direction side (symbol 3).
The blade structure has a shape in which a slot is provided on the lower side (reference numeral 5) on the back surface / traveling direction side.
Furthermore, it is set as the shape which provided the winglet in the braid front-end | tip part upper side (symbol 4).

Rowing a kayak using the paddle according to the present invention can proceed even with the above-described modern paddle rowing method, and a considerable speed can be achieved with the row padding method. Anyone who can row kayaks can easily handle it.

    In the case of the Aruute paddle, the shape is devised and the paddle becomes more efficient with reference to the wing theory of Kutta Zhukovsky and Lanchester Prandtl. In the present invention, as shown in FIG. 6, a slot and a flap are installed in the blade of the altitude paddle. Use the vortex effect to increase the lift and increase the driving force. This is because more water can be sent to the rear than the blade body area by the water flow and vortex. Blade tip vortices generated at this time can be reduced by winglets as shown in FIG.

    The height of the upper side of the blade of the alute paddle was lengthened (sign 3) to provide a flap action. Similarly, the lower side height (symbol 2) was shortened, and a slot was provided on the lower side (symbol 5) on the back surface / traveling direction side. Thereby, more water in front can be moved backward by moving the paddle in water. Unlike the aircraft, the paddle of the kayak moves the rower from the direction of travel and from the front to the rear, so the flaps are installed in the front and the slots are installed in the rear.

To row the kayak, the rower tilts the paddle blade 45 to 60 degrees and stabs it in the front water surface and pulls the blade backward. As shown in FIG. 7, the blade first receives water to be pulled rearward on the rear side / rower side (symbol 2), and then receives the front side / traveling direction side (symbol 3). The water flow that moves directly backward is high in pressure by Bernoulli's theorem. Similarly, the pressure is low on the opposite side / front of the blade. 3 in this
Therefore, the water in the forward traveling direction moves backward. On the other hand, as in Kutta Zhukovsky's wing theory, the vortex generated on the blade surface flows forward in the opposite direction.

In the blade of the paddle according to the present invention, the vortex flowing on the surface is received on the rear side / rower side (reference 2) having a short length and accelerated on the front side / traveling direction side (reference 3) having a long length. Escape in the direction. Because it escapes faster than a normal altitude paddle, the pressure difference between the rear and front increases, increasing lift.
Since the slot is installed in the lower side (reference numeral 5) on the back side and the traveling direction side, the vortex flowing on the front side of the blade is also released to the water surface side. Due to the effects on both sides of the blade, the blade drawn from the front to the rear becomes wider than the actual area, and the amount of water moved to the rear can be increased more than a normal altitude paddle.

In order to obtain the above effect, the paddle shaft (reference numeral 1) is installed at a position of 8:77 to 30:55 in the ratio of rear / rower side (sign 2): forward / traveling direction side (sign 3). It was offset. Therefore, the shaft is also installed in front. The power of the rower is prevented from entering the flaps too much and being attenuated. In addition, the position of 8:77 is the position at the very back side because the thickness of the shaft exists. Similarly, the position of 30:55 is a position on the rear side of the paddle shaft (reference numeral 1).
The position of the paddle shaft seems to be best at 5:12. This position has good balance and operability in kayak operations such as rolls and braces.

A winglet is provided on the upper side of the blade tip (reference numeral 4) to reduce the vortex tip vortex of the Lanchester Prandtl and reduce paddling loss.
The wing tip vortex is a vortex rotating from the blade tip (reference numeral 4), and flows in this case while spreading forward as shown in FIG. Since the winglet of the paddle of the present invention allows the tip vortex to escape in a straight line, the resistance to the water flow drawn from the front as lift can be reduced.

Types of kayak paddles (a) Feather paddles (b) Greenland paddles (c) Alute paddles (d) Paddles of the present invention Illustration of paddle blade inclination Front view of the shaft root portion from the blade of the paddle of the present invention (A) Side view (B) Front view Plan view of the shaft root from the blade of the paddle of the present invention (A) Side view (B) Plan view Bottom view of the shaft root from the blade of the paddle of the present invention (A) Side view (B) Bottom view Conceptual diagram of slots and flaps (a) Perspective view of alute paddle (b) Conceptual perspective view of paddle according to the present invention Action explanatory diagram of paddle of the present invention Perspective view at the time of winglet installation (I) Perspective view from the rear (B) Perspective view from the front Illustration of tip vortex (A) Conceptual diagram of tip flow (B) Conceptual view of tip flow with winglet attached

Explanation of symbols

1 Paddle shaft 2 Blade rear / rower side 3 Blade forward / traveling direction 4 Blade tip 5 Slot

Claims (3)

In order to install the shaft position in front of the center of the blade width, the paddle shaft (reference 1) is in the ratio of rear / rower side (reference 2): forward / traveling direction side (reference 3) 8: 77-30: A kayak paddle constructed at 55.
A kayak paddle having a blade structure according to claim 1 and having a slot provided on the lower side (reference numeral 5) of the back surface and the traveling direction side.
          A kayak paddle having a shape in which a winglet is provided on an upper side (sign 4) of the blade tip portion according to claim 1 or 2.

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