JP5058772B2 - kite - Google Patents

Description

  The present invention relates to a kite with improved flight characteristics, and more particularly to a kite with an improved assembly method.

  Various kites have been devised and used since ancient times. In recent years, kites with improved flight characteristics have been proposed by incorporating fluid dynamics, particularly aircraft dynamics, into the design (see, for example, Patent Document 1). .

As shown in FIGS. 10 to 12, this kite includes a central bone 21, a main wing main bone 22, a main wing leading edge bone 23, a main wing reinforcing bone 24, a main wing intermediate vertical bone 25, a tail wing bone 26, a main wing extension bone 27, and a main wing. The main bone 21 and the main wing main bone 22 are attached by a main wing main bone joint 33, and the central bone 21 and the main wing reinforcement bone 24 are attached by a main wing reinforcement bone joint 34. ing.
Here, 32 indicates a main wing intermediate reinforcing bone, and 31 and 32 indicate a main wing and a tail wing, respectively.

  When the heel 20 is assembled, first, the central bone 21 is disposed on the central symmetry axis of the heel sheet 29. Next, the main wing main bone 22 in the horizontal direction is arranged in the main part of the main wing 31. The central bone 21 is connected to the main wing main bone 22 using a resin main wing main bone joint 33 as shown in FIG. 12A so that the central bone 21 can be bent. Similarly, the main wing reinforcing bone 24 is assembled using the main wing reinforcing bone joint 34. Once assembled, the aggregate is bonded to the heel sheet 29 and secured to each other.

  The remaining aggregates are also bonded in the same manner, and when the framework is completed, as shown in FIG. 11, the left and right main wing main bones 22 are assembled with springs 35 and spring joints 36 and 36 with an upper angle θa. In FIG. 12B, the spring joint 36 is used by being bent at an obtuse angle, but may be used by being bent at an acute angle.

  Each joint is provided with a plurality of holes or grooves for fitting and fixing the aggregate. The groove has a substantially U-shaped cross section, but has a horseshoe shape whose entrance is a little narrow so that the aggregate can be fixed.

  In addition, in order to improve the efficiency of the assembly work, a scissors has been proposed in which a place where each bone is arranged is printed on a scissors sheet and each bone is pasted with a double-sided tape or an adhesive (for example, Patent Document 2).

  Furthermore, by securing the lift and protecting the central bone by covering the central part of the leading edge of the other main wing with the plate bone from the central part of the leading edge of the main wing where the lift is generated most. A cocoon that can be used has also been proposed (see, for example, Patent Document 3).

Japanese Unexamined Patent Publication No. 2000-262772 Japanese Patent No. 395950 Japanese Patent No. 3699677

By the way, since this heel 20 affixes each bone directly to the heel sheet 29, there is a problem that a frame composed of each aggregate is likely to be distorted.
Moreover, the heel sheet | seat 29 is using the nonwoven fabric from a viewpoint of weight reduction. When the nonwoven fabric is used as a kite sheet, the wind is easy to escape and loss of lift is likely to occur, and the frame formed by each aggregate pasted in the strong wind is distorted, and the kite 20 is tilted and rotated. There was also a problem that occurred and contributed to the crash.

  In view of the problems of the conventional kite, the present invention can perform stable flight without causing distortion in the frame formed by each aggregate, even in the case of flying in a gust or strong wind. An object of the present invention is to provide a kite capable of ensuring sufficient lift and having high flight performance.

In order to achieve the above object, the kite of the present invention comprises, on a kite sheet, a central bone serving as a target axis of the kite, a main wing main bone disposed in a main part of the main wing orthogonal to the central bone, and the central bone. A main wing reinforcing bone arranged at an inclination from below the intersection with the main wing main bone toward the main wing main bone, and a main wing thin bone arranged from the leading edge portion of the main wing toward the main wing tip. In the kite, the main wing main bone, the main wing reinforcing bone, and the main wing fine bone are arranged in advance on a lightweight flat plate separate from the kite sheet to form a framework structure, and the lightweight flat plate is connected to the leading edge of the main wing from the main wing tip. A front portion of the wing that covers the position of the main wing main bone, the main wing reinforcing bone, and the main wing thin bone through the central portion and further from the central portion of the main wing leading edge through the tip portion of the central bone, and in which the main wing lift acts effectively have covered the edge vicinity, as the target axis center bone, so that the pair before Characterized in that it has adhered to the kite sheet.

  In this case, the main wing main bone and the main wing reinforcing bone arranged on the lightweight flat plate can be assembled in advance by bonding with an adhesive to form a framework structure.

  Moreover, a lightweight flat plate can be used as a foamed resin sheet member.

  In these cases, a weight can be arranged on the central bone so that the position can be adjusted.

  When the weight is disposed on the central bone so that the position thereof can be adjusted, the central bone can have a hollow structure, and the weight can be attached to the inside of the central bone.

  The lightweight flat plate covers the positions of the main wing main bone and main wing reinforcing bone from the central portion of the main wing leading edge through the tip of the central bone, and is centered on both ends of the main wing main bone, main wing reinforcing bone, and main wing main bone. Divided into a central lightweight flat plate with a longitudinal bone parallel to the bone, and a wing tip lightweight flat plate with the main wing thin bones covered from the central part of the main wing leading edge through the main wing wing tip. can do.

  In this case, a regulating member protruding from the central lightweight flat plate toward the wing tip lightweight flat plate can be disposed on the lightweight flat plate.

  According to the kite of the present invention, the arrangement positions of the main wing main bone, the main wing reinforcing bone, and the main wing thin bone are arranged from the main wing wing tip to the main wing leading edge central portion, and from the main wing leading edge central portion to the distal end portion of the central bone. A lightweight flat plate that covers the vicinity of the leading edge of the wing that covers and effectively lifts the main wing is attached to the heel sheet in pairs with the central bone as the target axis. The main wing main bone, main wing reinforcement bone, and main wing thin bone of the material are arranged on a lightweight flat plate that is separate from the heel sheet, ensuring sufficient strength and surface accuracy and assembling the heel. It is possible to provide a kite capable of performing a stable flight without causing distortion in the frame formed by each bone even in the case of a gust wind or a strong wind flight without impairing the wind characteristics.

  In addition, when the main wing main bone and the main wing reinforcing bone arranged on the lightweight flat plate are assembled in advance by bonding with an adhesive to form a skeleton structure, the skeleton main bone and the main wing reinforcing bone have a high surface accuracy. After assembling while ensuring sufficient surface accuracy on a surface plate or the like, it can be placed on a lightweight flat plate. In this case, in addition to the main wing main bone and the main wing reinforcing bone, a vertical structure parallel to the central bone can be used as a frame structure positioned at both ends of the main wing main bone.

  When the lightweight flat plate is a foamed resin sheet member, the foamed resin sheet member has a bending strength far greater than that of the eaves sheet in the range where the lift of 1/4 to 1/3 of the chord length is most generated. Therefore, it is possible to reduce the reduction of lift due to air leakage at the time of lift generation and distortion from the light flat plate of the surface, and to perform stable flight with much higher lift even under the same wind speed.

  Further, when the weight is disposed on the central bone so that the position of the weight can be adjusted, the center of gravity of the heel can be easily changed. For example, the weight is disposed at the rear end of the tail of the central bone, and the center of gravity is disposed on the tail. By moving to the side, the glide speed when throwing a spear by hand can be stalled.

  In addition, when the central bone has a hollow structure and a weight is disposed inside the central bone, it can be easily attached and detached by fitting an iron core weight into the hollow of the central bone, and position adjustment is also easy. Can be done.

  The lightweight flat plate covers the positions of the main wing main bone and main wing reinforcing bone from the central portion of the main wing leading edge through the tip of the central bone, and is centered on both ends of the main wing main bone, main wing reinforcing bone, and main wing main bone. Divided into a central lightweight flat plate with a longitudinal bone parallel to the bone, and a wing tip lightweight flat plate with the main wing thin bones covered from the central part of the main wing leading edge through the main wing wing tip. In order to facilitate the carrying of a large kite, a four-fold structure can be adopted, and the kite wing can be made to fly with a two-step elevation angle.

  Further, when the regulating member protruding from the central lightweight flat plate toward the wing tip lightweight flat plate is disposed on the lightweight flat plate, the wing tip lightweight flat plate swings between the central lightweight flat plate and the wing tip lightweight flat plate. As a result, it is possible to fly with the optimum two-step upside angle by regulating the swinging width when swinging.

  Hereinafter, embodiments of the bag of the present invention will be described with reference to the drawings.

  1 to 6 show an embodiment of the bag of the present invention.

The kite 1 includes a central bone 4 serving as a target axis of the kite 1, a main wing main bone 5 disposed in the vicinity of an aerodynamic center serving as a main part of the main wing 11, and an intersection of the central bone 4 and the main wing main bone 5. The main wing reinforcing bone 6 that is inclined from the lower side toward the main wing main bone 5 is used as a main component, and the main wing thin bone 13 that is arranged from the main wing leading edge portion toward the main wing tip 11a, and the tail wing 12 The tail wing bone 10 for maintaining the shape of the lateral outer edge portion is attached to the heel sheet 2.
The rod 1 covers the arrangement position of the main wing main bone 5 and the main wing reinforcing bone 6 from the central portion of the main wing leading edge through the tip portion of the central bone 4, and the main wing main bone 5, the main wing reinforcing bone 6 and the main wing main A central lightweight flat plate S1 in which longitudinal bones 7 and 7 parallel to the central bone 4 are disposed at both ends of the bone 5, and a position where the main wing thin bone 13 is disposed from the central portion of the main wing leading edge through the main wing tip 11a, The wing tip lightweight flat plate S2 on which the main wing thin bones 13 are arranged is attached to the heel sheet 2 so as to be paired with the central bone 4 as an object axis.
The lightweight flat plate is not a large and quadruple-folded kite, but in the case of a double-folded kite that does not fly with a two-step elevation angle, it has a split structure of a central lightweight flat plate S1 and a wing tip lightweight flat plate S2. There is no need to do.

  The material of the central lightweight flat plate S1 and the wing tip lightweight flat plate S2 is not particularly limited, and is a foamed resin flat plate, such as a styrene foamed resin flat plate, which is stronger and lighter than the heel sheet 2 using a nonwoven fabric or the like. Etc. can be used.

As shown in FIG. 2 (a), the main wing main bone 5, the main wing reinforcing bone 6 and the vertical bones 7 and 7 arranged on the central lightweight flat plate S1 are preliminarily placed on a work table 30 having a high surface accuracy such as a surface plate. It can be set as the frame structure 3 assembled by bonding with a strong adhesive such as an epoxy adhesive.
As a result, the finished ridge 1 is obtained by attaching a flat plate of foamed resin supported by the framework structure 3 obtained by assembling the main aggregate constituting the ridge 1 while ensuring sufficient surface accuracy to the ridge sheet 2. It is difficult to cause distortion, and it is possible to maintain stability during flight in gusts and strong winds.

  In addition to the round material shown in FIG. 2 (a), each aggregate constituting the kite 1 can also use square wood, including glass fiber, carbon reinforced resin, wood such as cypress and lamin, solid In addition, a wire material having a required rigidity made of a hollow or foamed resin material, a metal material such as bamboo, piano wire, or the like can be used.

As shown in FIG. 2C, the framework structure 3 composed of the main wing main bone 5, the main wing reinforcing bone 6, and the longitudinal bones 7 and 7 assembled on the work table 30 is placed on the work table 30 as a central lightweight flat plate S1. And paste by appropriate means.
At this time, it is preferable to dispose a regulating member 16 that protrudes from the central lightweight flat plate S1 toward the wing tip lightweight flat plate S2 and regulates the swing of the wing tip lightweight flat plate S2.

  The configuration of the regulating member 16 is not particularly limited, and for example, a leaf spring or the like can be used. The arrangement position of the restricting member 16 is stepped on the central lightweight flat plate S1 so that the surface is flush with the central lightweight flat plate S1 between the longitudinal bone 7 at a position away from the central bone 4 and the central lightweight flat plate S1. It is preferable to arrange and provide a part.

Then, as shown in FIGS. 3A to 3B, the wing tip is provided with a central lightweight flat plate S <b> 1 and a main wing fine bone 13 and a fixing member 17 for fixing the regulating member 16. The lightweight flat plate S2 is placed at a predetermined location on the heel sheet 2 to which the central bone 4 and the tailbone 10 are attached, and is attached by appropriate means.
In this case, the restricting member 16 is lightened by the surface fastener M attached to the surface of the restricting member 16 and the surface fastener M ′ attached to the back surface of the fixing member 17 (the contact surface with the light-weight flat plate S2). It is made to fix to flat plate S2. Thereby, the storage in the case of a four-fold large basket can be easily performed.

  Further, as shown in FIG. 4, the fixing member 16 is fixed by cutting out the portion where the restricting member 16 is located when the wing tip lightweight flat plate S2 is positioned on the same plane as the central lightweight flat plate S1. Surface fastener M is attached to both sides of the portion, and the same surface as surface fastener M attached to the surface of regulating member 16 when wing tip lightweight flat plate S2 is positioned on the same surface as central lightweight flat plate S1. It is also possible to fix the surface fastener M by pressing the fixing member 17 having the surface fastener M ′ adhered to the position corresponding to the three surface fasteners M so that the surface fasteners M are arranged at the three upper positions.

A weight 18 can be disposed on the central bone 4 that is the target axis of the heel 1 so that the position thereof can be adjusted.
The method of attaching the weight 18 is not particularly limited. For example, the weight 18 can be attached so as to sandwich the central bone 4 from the outside, and as shown in FIG. 5 (a), the central bone 4 has a hollow structure. The weight 18 can be attached to the inside.
In this case, it is preferable that the weight 18 is attached so as to be fitted as an iron core having substantially the same size as the inner diameter of the central bone 4.
Further, as shown in FIGS. 5B to 5C, when the weight 18 is disposed in the vicinity of the center of the central bone 4, for example, the slit 4 a is provided in the central bone 4 so as to protrude from the weight 18. By protruding the protruding portion 18a from the slit 4a, the weight 18 can be easily moved in the direction of the arrow.

Although the kite 1 of this embodiment has a large lift and excellent flight performance, for example, a weight 18 is attached to the rear end of the tail 12 so that the position of the tail 18 can be adjusted, and the center of gravity is shifted to the rear, so that the glide speed Can be reduced.
Then, using this characteristic, when the rod 1 is attached to a long rod such as a fishing rod in a room such as a gymnasium and the rod is shaken laterally, the rod 1 rises due to the generated lift while performing horizontal flight. If the direction in which the kite is shaken is further reversed, kite 1 follows this and reverses, and then rises while continuing the horizontal flight. By repeating this operation, the kite reaches the overhead. At this time, when the kite stops shaking, the kite begins to glide from the overhead. When the altitude drops to some extent after gliding so that the yarn will not bend, if the heel is shaken again to the left and right, it raises by generating lift.
Hereinafter, by repeating this operation, the kite 1 can repeatedly lift and glide due to the generation of lift, and can easily perform kiting even in a room without wind.

Further, as shown in FIG. 6A, the kite 1 can fly with a two-step upper angle by the regulating member 16, and the swinging width of the main wing blade tip 11a can be regulated.
Moreover, by removing the fixing member 17 and the spring 14, as shown in FIG. 6B, it can be easily folded and stored and transported.

  Then, after the central lightweight flat plate S1 and the wing tip lightweight flat plate S2 are attached to the flange sheet 2, the left and right main wing main bones 5 are provided with an upper angle by the springs 14 and the spring joints 15 and 15, as in the conventional example. The kite thread is attached to the thread attaching portion 8 to complete the assembly (see FIG. 6A).

Next, the flight principle of the kite 1 flying in a windless state will be described.
Figure 7 shows the relationship between the angle of attack and the center of wind pressure of a two-dimensional wing, that is, a wing with a high aspect ratio that resembles the shape of a soaring eagle wing. Is.
As shown in FIG. 7, in the case of a two-dimensional flat wing, the wind pressure center is 1 of the wing width c from the leading edge of the wing regardless of the magnitude of the angle of attack in the case of non-stall flight with an angle of attack equal to or less than the stall angle. It is at the point of / 4.
In this respect, if the wing is supported in parallel with the wind, the moment to change the angle of the wing does not change regardless of the angle of attack.
Also, at this point, the moment applied to the wing is always zero and constant, so it is also called the aerodynamic center (usually, the aircraft flies with the center of gravity before the aerodynamic center).
In general, in a non-planar wing having a camber in cross-section, there is a point that the moment is not zero but constant. This is called a general aerodynamic center, and usually the aerodynamic center and the wind pressure center do not coincide.
On the other hand, the flat blade has a characteristic that the aerodynamic center coincides with the wind pressure center.
Now, the kite 1 shown in FIG. 8 shows the balance of force when the kite 1 is flying horizontally at the angle of attack below the stall angle by pulling horizontally with the kite.
The center of gravity of the kite 1 is a fine adjustment of the position of the weight 18 that is placed in an adjustable state at the rear end of the kite 1. Unlike the aircraft, the center of gravity is located slightly behind the wind pressure center, that is, the aerodynamic center. .
On the other hand, since the thrust P applied to the center of the thread is applied by the horizontal movement of the kite, when the gravity applied to the center of gravity is G, the angle of attack θ is expressed by the following relational expression.
Tanθ = G × (distance between wind pressure center and yarn center) / (P × (distance between yarn center and wind pressure center))
Here, by adjusting the thrust P, the angle of attack θ is maintained at a large value equal to or less than the stall angle, and a large lift coefficient is obtained as shown in FIG. 9, and lift is efficiently generated even at low flight speeds. And continue to fly.
And if the lift force generated at this time becomes larger than the gravity G, the kite 1 will rise even without wind.
Here, when you stop pulling the kite, kite 1 tries to glide on its own.
As shown in FIG. 8, the center of gravity of the kite 1 is slightly behind the center of the wind pressure when the angle of attack θ is equal to or less than the stall angle. Therefore, the momentary force of zero thrust generated at the moment when the thrust P from the kite is reversed. In gliding, the eagle is pulled by gravity G and raises its head.
As a result, the kite 1 stalls, and the wind pressure center moves rearward from the center of gravity as shown in FIG.
Then, the kite 1 is lowered its head again and makes a non-stall flight, the center of the wind pressure moves forward from the center of gravity, and the kite 1 becomes stalled again. This is called pitching flight.
Normally, in pitching flight, the glide speed is extremely lowered due to drag during stall flight, and the speed is lost after 1 to 3 pitches and crashes.
When the kite is pulled in the opposite direction at a short moment when this pitching flight is continued, the kite 1 is pulled at the center of the thread and again becomes a non-stall state and receives lift and rises.
By repeating such movement of the kite, kite 1 will rise despite no wind.
The above example is an example in which the kite is manually fried, but the small kite 1 can be safely fried even in a small indoor space by repeatedly moving forward and backward using a toy electric car or train.

  As described above, the bag of the present invention has been described based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations may be changed as appropriate without departing from the spirit of the present invention. It is something that can be done.

  The kite of the present invention can perform stable flight without causing distortion in the frame formed by each aggregate, even in the case of flight in gusts or strong winds, and also ensures sufficient lift. In addition to the kite used outdoors, the kit can be suitably used for the kite used indoors.

It is a top view which shows one Example of the coffin of this invention. The work method of arranging the main wing main bone, main wing reinforcement bone and longitudinal frame structure on the central lightweight flat plate is shown. (A) shows the assembly of the main wing main bone, main wing reinforcement bone and vertical frame structure on the work table. , (B) shows a central lightweight flat plate, and (c) shows a frame structure placed on the central lightweight flat plate. The work method which affixes a center lightweight flat plate and a wing tip lightweight flat plate to a scissors sheet | seat is shown, (a) shows the place before arrange | positioning both sheets on a scissors sheet, (b) shows the place arrange | positioned and affixed. (A) shows a state where the main wing wing tip to which the wing tip lightweight flat plate is attached is bent about 90 degrees with respect to the main wing to which the central lightweight flat plate is attached ( b) shows a state in which the main wing tip is flush with the main wing, and (c) shows a state in which the regulating member is fixed by a fixing member. An example in which the central bone of the same coffin is provided with a hollow structure and a weight is arranged inside, (a) is an example arranged at the tail part, (b) is an example arranged movably near the center, (C) is an enlarged view of part A of (b). The front view of the same coffin is shown, (a) shows the state of the upper two-step angle, and (b) shows the state where the main wing is folded. It is a graph which shows the distance from the front edge of the wind pressure center which changes with the angle of attack of a kite. It is explanatory drawing of the balance of the force added to the kite which flies stably in a windless state. It is a graph which shows the relationship between an angle of attack and a lift coefficient. It is a top view of the conventional bag. It is a perspective view which shows the state which attached the spring to the same coffin. It is a perspective view which shows the structure of the joint used for the same framework.

Explanation of symbols

1 凧 2 凧 sheet 3 skeleton structure 4 central bone 5 main wing main bone 6 main wing reinforcement bone 7 longitudinal bone 11 main wing 11a main wing wing tip 16 regulating member 17 fixing member 18 weight S1 central light weight flat plate S2 wing tip light weight flat plate

Claims (7)

The main wing main body from the lower side of the intersection of the central bone and the main wing main bone, and the main bone disposed in the main part of the main wing orthogonal to the central bone, A lightweight flat plate that is separate from the kite sheet, in a kite comprising a main wing reinforcing bone arranged to be inclined toward the bone and a main wing fine bone arranged from the leading edge of the main wing toward the wing tip. The main wing main bone, the main wing reinforcing bone, and the main wing thin bone are pre-assembled into a framework structure, and the lightweight flat plate is connected to the main wing leading edge central portion from the main wing tip and further from the main wing leading edge central portion to the central bone. the wing main bone through the distal end portion of the cover the positions of the wing reinforcement bone and wing fine bone and the proximity to the leading edge of the wing to lift the wing acts effectively not covered, as the target axis center bone, characterized in that affixed to the kite sheet such that the pair .   The wing according to claim 1, wherein the main wing main bone and the main wing reinforcing bone arranged on the lightweight flat plate are assembled in advance by bonding with an adhesive to form a skeleton structure.   The bag according to claim 1, wherein the lightweight flat plate is a foamed resin sheet member.   The scissors according to claim 1, 2, or 3, wherein a weight is disposed on the central bone so that the position of the weight can be adjusted.   The heel according to claim 4, wherein the central bone has a hollow structure, and a weight is attached to the inside of the central bone.   The lightweight flat plate covers the positions of the main wing main bone and the main wing reinforcing bone from the central portion of the main wing leading edge through the distal end portion of the central bone, and the central bone is disposed at both ends of the main wing main bone, the main wing reinforcing bone, and the main wing main bone. It was divided into a central lightweight flat plate with parallel vertical bones, and a wing tip lightweight flat plate with the main wing thin bones covered from the main wing leading edge central part through the main wing tip. The scissors according to claim 1, 2, 3, 4 or 5.   The rod according to claim 6, wherein a regulating member protruding from the central lightweight flat plate toward the wing tip lightweight flat plate is disposed on the lightweight flat plate.

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