KR20220157803A - Flying disc using asy㎜etric lift - Google Patents

Abstract

The present invention relates to a flight disk using asymmetric lift, which can implement various flight characteristics combining linear motion and rotational motion by inducing asymmetric lift by applying an airfoil structure of an airplane wing to the disk. The flight disk using asymmetrical lift of the present invention comprises: a lower surface unit (120); and an upper surface unit (110).

Description

Flying disc using asymmetric lift}

The present invention relates to a flight disc that is thrown and thrown by rotation, and more specifically, by applying an airfoil structure of an airplane wing to a disc to induce asymmetric lift, using asymmetric lift that can realize various flight characteristics combining linear motion and rotation motion. It's about the flying disc.

The flying disc is a toy that can be enjoyed outdoors and has a flight characteristic in that it flies horizontally and then lands when thrown by rotation.

Its speed and flight distance are determined by the strength of the force thrown into the air without its own propulsion.

That is, as the disk flies in the air, it receives drag and receives lift according to the shape of the disk and the flow of air.

Therefore, in most flying discs, the wing structure is formed along the rim and the weight gathers on it, and force is generated by the acceleration thrown by its own weight, which may lead to injury if hit, and the disc's structure to receive a lot of air resistance It is common for them to increase in size.

Because of this, the shape of the flying disk was inevitably simply one-sided, making it impossible to realize various flight characteristics.

Republic of Korea Patent Publication No. 10-2013-0023009 (2013.03.07)

The present invention has been created to solve the above problems, and an object of the present invention is that the cross section has a streamlined structure of the cross section of an airplane wing due to the asymmetry of lift generated from the front, rear and side surfaces when flying in the air. It is to provide a flying disk using an asymmetrical lift that can realize various flight characteristics as well as linear motion as well as rotational movement of the central axis of the disk.

For the above purpose, the present invention is a flight disk having a circular plane shape, based on an imaginary line representing the total diameter of the flight disk, and has a convex shape downward so that the lower center has a first thickness value, but from the center If the slope corresponding to the maximum first thickness value compared to the distance to the edge is formed to have a value between 0 and 30 degrees; Based on the imaginary line representing the total diameter of the flying disc, the portion corresponding to the first position in the direction from the center to the rim is convex and has a second thickness value upward, and a protrusion forming a ring shape is formed, but from the center to the rim an upper surface portion formed to have a ratio of the second thickness value to a distance of 10 to 30%; It is characterized by consisting of.

At this time, the upper surface portion is made of a material having elasticity and coupled to the lower surface portion of a relatively hard material, but the protrusion is formed by inserting a ring-shaped structure having a selected diameter between the upper surface portion and the lower surface portion. It can be.

In addition, by changing the overall diameter of the annular structure, the position of the protrusion may be configured to be variable in the horizontal direction.

In addition, the upper surface portion may have a third thickness value of 70 to 80% of the first thickness value of the upper center portion based on an imaginary line representing the total diameter of the flight disc.

In addition, the upper surface portion may be composed of a first inclined portion and a second inclined portion sequentially formed so that the inclined surface connecting the upper end of the protruding portion and the rim has a smaller inclination angle toward the outside.

As a tool for leisure and sports, the present invention can construct a flying disc capable of realizing various flight characteristics through simple understanding of principles. In addition, it can be used as an educational tool for learning lift and flight principles through the flight principles and actual flight patterns applied to the present invention, and the principles of the present invention can be applied to related industries in the form of grafting small aircraft such as drones can promote development.

1 is a perspective view according to an embodiment of the present invention;
2 is a front view according to an embodiment of the present invention;
3 is a plan view according to an embodiment of the present invention;
4 is a side cross-sectional view according to an embodiment of the present invention;
5 is a cross-sectional view showing detailed dimensions according to a preferred embodiment of the present invention;
6 is a state diagram showing the flight state of the flight disk according to the present invention;
7 is an explanatory diagram for explaining the flight theory according to the present invention;
8 is an exploded perspective view showing a structure according to another embodiment of the present invention;
9 is a side cross-sectional view showing a structure according to another embodiment of the present invention;
10 is a cross-sectional side view showing changes in the shape of various protrusions for asymmetric lift.

Hereinafter, the structure of the flight disk using the asymmetric lift of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view according to an embodiment of the present invention, Figure 2 is a front view according to an embodiment of the present invention, Figure 3 is a plan view according to an embodiment of the present invention, Figure 4 is a side cross-sectional view according to an embodiment of the present invention , In the present invention, the flight is performed by throwing and throwing by hand rotation with a disk having a circular plane shape.

For convenience of specific shape description, the upper side is based on a virtual line representing the total diameter of the flight disc (hereinafter referred to as 'disc'), and the virtual plane, which is actually a set of the virtual lines, is the upper surface portion 110 and the lower side is the lower surface Section 120 defines.

In the present invention, the streamlined structure of the cross section of the airplane wing is applied to the upper surface of the disk, that is, the upper surface portion 110, and the lower surface of the disk, that is, the lower surface portion 120, has a convex structure to form a closed structure covering the entire lower surface.

As shown in FIG. 4, the cross-sectional structure of the disk is a streamlined shape like the cross section of an airplane wing, and when flying in the air, the rotational movement of the central axis of the disk as well as the linear movement appears due to the asymmetry of the lift generated from the upper and lower surfaces and sides of the disk. .

At this time, the air velocity in each part of the disk is determined by the vector composition of the two components, the relative velocity of the air due to the linear motion and the relative velocity of the air due to the rotational movement of the disk itself.

Arrows indicated by dotted lines in FIG. 3 indicate the velocity of vector synthesized air at each part of the disk surface. Therefore, during the flight of the discus, there is a difference in air speed between the front part (①) and the back part (②) of the discus in the direction of travel, and as a result, a difference in lift occurs according to Bernoulli's principle.

In addition, there is also a speed difference above (③) and below (④) of the disk in the direction perpendicular to the direction of travel, and for this reason, a difference in lift occurs.

The same difference in lift occurs on the bottom surface of the disk as on the top surface, and also between the top and bottom surfaces.

Arrows indicated by dotted lines in FIG. 4 indicate the air velocity at each part of the disk surface.

Because of the structure of the disk, the length of the arrow, or the size of the speed, varies in all parts of the disk, and this difference in speed causes the central axis of the disk to rotate. In this case, the degree of rotation of the rotating shaft is determined by the rotational speed when the disc is thrown.

In a specific form for this purpose, the bottom portion 120 has a convex shape downward so that the lower center 121 has a first thickness value based on the virtual line representing the total diameter of the flight disc 100, but from the center to the rim The slope corresponding to the maximum first thickness value compared to the distance of is formed to have a value between 0 and 30 degrees.

In addition, the upper surface portion 110 is convex so that the portion corresponding to the first position in the direction from the center to the edge has a second thickness value toward the upper side with respect to the imaginary line representing the total diameter of the flight disc, and the planar shape has a ring shape. A protrusion 112 is formed, and a curved structure is formed so that the ratio of the second thickness value to the distance from the center to the edge has a value between 10 and 30%.

As shown in FIG. 4, an airfoil having the same shape is rotated 360 degrees around the center to form a disk based on a streamlined airfoil shape in cross section of the disk.

In the present invention, the structure of the upper surface portion 110 is determined by the ratio of a straight line c extending from the center of the disk to the rim of the disk and the maximum thickness of the protrusion forming the airfoil, that is, t representing the second thickness value. A cross-section of a disk with a t/c ratio of about 18% is shown.

In addition, the structure of the lower surface portion 120 is determined by the slope h / c, which is the ratio of the straight line c connecting the center of the disk to the end of the rim and the maximum thickness of the lower surface of the disk, that is, h corresponding to the first thickness value, and the slope is 0 ( can have any angle less than 30 degrees from the plane).

Therefore, the structure of the disc can be determined by appropriate combinations of the three variables c, t, and h to implement various flight characteristics under various conditions, and smooth flight characteristics cannot be obtained if the previously set range is exceeded.

In the upper surface portion 110, the third thickness value of the upper center portion is 70 to 80% of the first thickness value based on the imaginary line representing the total diameter of the flight disk, and the upper end of the protrusion portion 112 It may be composed of a first inclined portion 113 and a second inclined portion 114 sequentially formed such that the inclined surface connecting the edge and the outer side has a smaller inclination angle.

Figure 5 is a cross-sectional view showing detailed dimensions according to a preferred embodiment of the present invention, the radius of the disk, that is, the distance from the center to the edge c = 150 mm, the first thickness value h = 10 mm, the second thickness value height t = 25 It shows the structure of the cross-section of the flying disc in mm. In addition, in the case of the upper surface portion, the surface from the center to the protrusion and the edge is curved, but as a preferred embodiment, a virtual center circle with a radius of 8 mm is placed on the center, and a radius of 25 mm is placed 30 mm from the center to the edge side. A first slope connecting the outer sides of the first semicircle and the second semicircle by forming a protrusion through the first imaginary semicircle and forming a second imaginary semicircle having a radius of 15 mm at 60 mm from the center toward the edge ( 113) and the second inclined portion 114 connecting the outside and the rim of the second semicircle are formed. At the same time, the edge portion was rounded in the form of a semicircle with a radius of 2mm to form a streamlined structure.

6 is a state diagram showing the flight state of the flight disk according to the present invention, and the flight of the disk can be performed in the following order.

① Give spin (rotation) when throwing the discus. ② The disc starts to rotate due to the difference in lift from the front, rear and sides of the disc. ③ The degree of rotation of the disc can be controlled according to the throwing power and spin speed. ④ Depending on the shape of the streamlined airfoil in the cross section of the disc, the inclination of the bottom of the disc (any angle in the plane), and the size of the disc, various flights can be produced.

7 is an explanatory diagram for explaining the flight theory according to the present invention, and theoretically explains the change in flight effect according to structural deformation along with specific flight principles through equations.

The lift generated on the streamlined wing formed on the disc is determined by Bernoulli's equation, and the Bernoulli's equation is given by the following [Equation 1].

가 된다. Here, P is the pressure of the fluid, ρ is the density of the fluid, v is the velocity of the fluid, h is the height of the vehicle, and g is the gravitational acceleration. The magnitude of lift acting on a streamlined wing is determined by Bernoulli's equation, and its magnitude is as follows. When an aircraft flies in the horizontal direction at a speed V, the air flow in the opposite direction occurs on the streamlined wing. At this time, as shown in FIG. 7 (a), the air velocity above and below the wing is

becomes

Applying Bernoulli's equation here gives the following [Equation 2].

가 되어 좌우변의 높이를 포함하는 항은 사라지고 나머지 항들은 다음 [수학식 3]과 같이 된다.Since the wings move only horizontally without height change, [Equation 2]

, and the term including the height of the left and right sides disappears, and the remaining terms become as follows [Equation 3].

The fact that the sum of the two terms above and below the wing is the same means that P is small when V is large.

가 되며 날개 위와 아래에서의 공기의 속도차이는 압력의 차이를 발생시키며 이것이 바로 양력의 원동력이 된다. 이 경우 양력은 위로 향하게 되고 그 크기는 다음 [수학식 4]와 같이 주어진다. Therefore, the pressure at the condition

The difference in air velocity above and below the wing creates a pressure difference, which is the driving force of lift. In this case, the lift force is directed upward and its magnitude is given by Equation 4 below.

If the direction of the wing is reversed, the result is also different according to Bernoulli's equation. Referring to FIG. 7 (b), it can be seen that the speed of the air above and below the wings is different than before.

가 되어 압력은

가 되고, 압력차에 해당하는 양력이 아래로 향하게 된다. 이 경우 양력의 크기는 다음 [수학식 5]와 같이 주어진다. this time

becomes and the pressure is

, and the lift force corresponding to the pressure difference is directed downward. In this case, the magnitude of the lift force is given by Equation 5 below.

The amount of lift acting on a streamlined wing depends on the speed of the air above and below the wing, and the direction of the lift also changes depending on the geometric shape of the wing relative to the direction of movement of the wing. 7(c) shows the two results examined above in one picture.

As such, it can be seen that the strength of the lift force varies according to the difference in speed. The cross-section of the streamlined wing structure of the present invention is the structure shown in FIG. 7 (c), and the overall shape is a disk-shaped structure formed when the opposing wings are rotated 360 degrees about the central axis.

Figure 8 is an exploded perspective view showing a structure according to another embodiment of the present invention, Figure 9 is a side cross-sectional view showing a structure according to another embodiment of the present invention, Figure 10 is a side cross-sectional view showing changes in the shape of various protrusions for asymmetric lift to be.

The present invention includes generation of asymmetrical lift due to horizontal motion as well as asymmetry of lift generated due to rotational motion. Therefore, the overall flight pattern of the present invention is determined by the synthesis of asymmetrical lift generated by horizontal motion and rotational motion. The most important factor in determining the amount of lift is the velocity of the air above, below, in front of, behind, and to the side of the wing, and this velocity depends on the structure of the wing. Therefore, various flight patterns can be induced according to the structure of the wing.

To this end, as in another embodiment of the present invention, the upper surface portion 110 is made of a material having elasticity and coupled to the upper side of the lower surface portion of a relatively hard material, but between the upper surface portion 110 and the lower surface portion 120 A ring-shaped structure 130 having a selected diameter is inserted to form the protrusion 112, and the overall diameter of the ring-shaped structure 130 is changed so that the protrusion 112 is positioned in the horizontal direction. It can be configured to be variable.

The structure 130 is an auxiliary component for the location and shape of the protrusion 112, and is made of a relatively hard material without significantly changing the weight of the flight disc 100. 120) and the same material.

In addition, the bottom portion 120 is made of a hard material, but a plurality of grooves 122 are formed in a concentric circle in a direction in contact with the upper side, that is, the upper surface portion 110, and position the ring-shaped structure 130 into which it is inserted. For insertion of the ring-shaped structure 130, a space is formed at the contact portion in a state where the upper surface portion 110 and the lower surface portion 120 are coupled, and the inserted ring-shaped structure is formed on the upper surface portion of the elastic material ( 110 is pushed upward to protrude so that the protrusion 112 is formed.

At this time, the upper surface portion 110 has a force to be in close contact with the lower side at all times, so that the outer cross section naturally forms a streamlined shape, that is, an airfoil structure, together with the formed protrusion 112, corresponding to the groove 122 by size, that is, The ring-shaped structure 130 is provided for each overall diameter corresponding to the groove 122, or the overall diameter of the ring-shaped structure 130 can be varied with a telescopic structure, etc., and the position of the protrusion 112 can be varied. can

As such, the structure can be simply deformed by moving the highest point of the streamlined wing, that is, the position of the protrusion 112, and as a result, a change in lift is induced and each structure can show a different flight pattern.

The rights of the present invention are defined by what is described in the claims, not limited to the embodiments described above, and that those skilled in the art can make various modifications and adaptations within the scope of rights described in the claims. It is self-evident.

100: flight disk 110: upper surface
111: upper center 112: protrusion
113: first inclined portion 114: second inclined portion
120: lower part 121: lower center
122 home 130 structure

Claims (5)

As a flight disk with a circular plane shape,
Based on the imaginary line representing the total diameter of the flight disc 100, the lower central part 121 has a convex shape downward so that it has a first thickness value, but the maximum first thickness value compared to the distance from the center to the edge If the corresponding slope is formed to have a value between 0 and 30 degrees, the portion 120;
Based on the imaginary line representing the total diameter of the flight disc 100, the portion corresponding to the first position in the direction from the center to the edge is convex to have a second thickness value upward, and the flat shape is a ring shape Protrusion 112 ) Is formed, but the upper surface portion 110 is formed with a curved structure such that the ratio of the second thickness value to the distance from the center to the edge has a value between 10 and 30%; A flight disk using asymmetric lift, characterized in that consisting of.
According to claim 1,
The upper surface portion 110 is made of a material having elasticity and coupled to the upper side of the lower surface portion of a relatively hard material,
A flight disc using asymmetric lift, characterized in that the protrusion 112 is formed by inserting a ring-shaped structure 130 having a selected diameter between the upper surface portion 110 and the lower surface portion 120.
According to claim 2,
A flight disc using asymmetric lift, characterized in that the position of the protrusion 112 can be varied in the horizontal direction by changing the overall diameter of the ring-shaped structure 130.
According to claim 1,
In the upper surface portion 110, the third thickness value of the upper center portion 111 is 70 to 80% of the first thickness value based on the imaginary line representing the total diameter of the flight disc. Characterized in that A flying disk using asymmetrical lift.
According to claim 4,
The upper surface portion 110 is composed of a first inclined portion 113 and a second inclined portion 114 sequentially formed so that the inclined surface connecting the upper end and the rim of the protruding portion 112 has a smaller inclination angle toward the outside. A flying disc using asymmetrical lift.

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