JP2000051539A - Model airplane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the angle of an elevation angle including the horizontal angle of the main wing of a model airplane provided with a conventional vertical sheet type body part, to improve the linearity of the body part as well and to increase the flying property of the model airplane. SOLUTION: In this model airplane, straw type resin tube 5 is used as the body part, a nose part having a main wing joining surface consisting of a resin foamed molding 1 or a resin molding 1a is attached to the front part of the straw type resin tube 5, the main wing is attached to the middle part of the straw type resin tube 5 through the main wing joining surface of the nose part and a tail wing is attached to the rear part of the straw type resin tube 5. The straw type resin tube 5 is inserted and fixed to a hole provided on the nose part and the main wing 2 is fixed to the main wing joining surface of the resin foamed molding 1 of the nose part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a model airplane.

[0002]

2. Description of the Related Art Conventionally, there has been known a model airplane having a size of about 6 to 20 cm mainly made of a paper sheet, a wood sheet and a resin sheet. Also, model airplane competitions are becoming popular. In such a competition, the flight performance of the model airplane, that is, the cruising time, the cruising distance, and the like have a great influence. At present, the most popular model airplane among these conventional model airplanes is a vertical fuselage model airplane as shown in FIG. Vertical tail C and nose A
Consists of a sheet integrally formed with a surface in the vertical direction. The main wing D and the horizontal tail E in the horizontal direction are inserted into slits provided in the vertical sheet, and a metal piece or a resin molded body is formed in the nose as a balance weight. A weight F is widely used. Although the model airplane having the vertical seat fuselage is easy to manufacture, the main wing and the horizontal tail are simply inserted into the slits, so the angle of insertion with respect to the fuselage is not stable, and the crash during use is not possible. Due to the impact of the wing, the main wing moves forward of the slit and widens the slit, loosening the insertion part. Has the disadvantage that it cannot be done.

[0003]

SUMMARY OF THE INVENTION The present invention stabilizes the elevation angle including the horizontal angle of the main wing of a conventional model airplane having a vertical seat-type fuselage, and improves the linearity of the fuselage. The purpose is to increase the flight performance of a model airplane.

[0004]

SUMMARY OF THE INVENTION The present inventor has proposed that the main wing attached to the slit of the vertical seat fuselage has a small width of about 1 mm, which is the thickness of the vertical seat, for fixing the main wing. Focusing on the lack of stability, if the main wing is glued to a flat part integrally extended from the nose, the angle of the main wing can be attached to the designed angle, and the design angle They have found that they can be stably maintained, and have completed the present invention based on this finding. That is, the present invention includes the following items. (1) A nose section having a main wing joining surface made of a resin foam molded article or a resin molded article is attached to a front part of the straw-type resin tube with the straw-type resin tube as a body part, and an intermediate part of the straw-type resin tube. A model wing having a wing attached via a wing joint surface of a nose portion, and a tail wing attached to a rear portion of the straw-type resin tube, wherein the straw-type resin tube is provided in a hole provided in the nose portion. A model airplane, wherein the model wing is inserted and fixed, and the main wing is fixed to a main wing joint surface of a resin foam molded body at a nose portion. (2) The model airplane according to (1), wherein the straw-type resin tube is made of polypropylene resin. (3) The model airplane according to (1) or (2), wherein the main wing, the tail wing, or the nose is made of expanded polystyrene or rigid expanded polyurethane. (4) The model airplane according to (1), (2) or (3), wherein bellows-like irregularities are provided in an intermediate portion of the straw-type resin tube. (5) No. (1), (2), (3) provided with an auxiliary straw-type resin tube that is short in parallel with the straw-type resin tube in the body part.
Or the model airplane described in (4). (6) The model airplane according to (1), (2), (3), (4) or (5), wherein at least one of the straw-type resin tubes has a whistle inside.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The straw type resin tube used in the present invention has an outer diameter of 5 to 15 mm, preferably 8 to 10 mm.
A thin resin tube having a thickness of 0.1 to 1 mm, which is a resin tube having a thickness of 0.1 mm, can be used. For example, a commercially available resin straw used when drinking a beverage can be used as it is. Specifically, a resin that can be a straw type resin can be used without any particular limitation, but a polypropylene resin is preferable in that a bellows portion can be provided because it can utilize a hinge function which is a characteristic thereof. As the straw having a bellows portion, a commercially available straw for a beverage can be used as it is. A resin straw provided with a bellows portion can be bent or stretched to an arbitrary shape, and the shape can be stably maintained. The nose portion used in the present invention uses a resin foam molded body or a resin molded body. The use of foam on the nose of the present invention
This is to take advantage of the advantage that the weight does not increase even if the volume is increased. Because of the foam, even if the nose is extended to the position where the main wing joint surface is attached to the main wing, the weight balance of the flight will not be lost. The foam of the nose of the present invention can be manufactured into a predetermined shape by cutting a foamed molded product having a size larger than a predetermined size of the nose. Further, it can be manufactured by foam molding using a mold having a shape of the nose. On the other hand, when a resin molded body is used for the nose, a gap is provided at the tip so that the weight balance of the flight is maintained even if the nose is extended to the position of the wing attachment where the wing joint surface is provided, so that the weight is reduced. At the same time, it is desirable to provide a shock absorbing rim at the tip instead of the shock absorbing action of the foam.

[0006] The tip of the straw-type resin tube can be inserted and fixed to the nose of the present invention. Therefore, an insertion hole for fitting into the outer shape of the straw-type resin tube is provided in the nose portion. Although a simple hole can be used as the insertion hole, any one of the upper and lower sides of the hole can be formed as a slit. The nose portion of the present invention is provided with a main wing joint surface for fixing the center rear surface of the main wing. This main wing joint surface can be at a predetermined angle designed horizontally or symmetrically from the center line of the upper surface of the nose. Further, the joining surface is not limited to a flat surface, but may be a curved surface, for example, a convex surface, for example, by selecting a shape of the joining surface according to a designer's intention, and fixing an angle in the extending direction of the main wing to a desired shape. it can. In the present invention, since the straw-type resin tube can be accommodated in the hole below the joint surface of the nose, it does not hinder the joint between the joint surface of the nose and the back surface of the main wing. The joint surface of the nose and the back surface of the main wing can be fixed with an adhesive. As the adhesive, it is desirable to firmly fix with a reactive adhesive, but a pressure-sensitive adhesive or a heat-sensitive adhesive can also be used. When a pressure-sensitive adhesive is used, an adhesive tape with release paper can be attached to the back surface of the main wing and / or the joining surface of the nose, and the release paper can be peeled off and fixed immediately before the main wing is attached. Even if a pressure-sensitive adhesive is used on both the bonding surface and the back surface of the main wing, it can be firmly fixed.

The foam used for the nose of the present invention is particularly preferably expanded polystyrene, expanded polypropylene or rigid expanded polyurethane. Foamed high impact polystyrene is preferred because of its high toughness and durability. Further, a foam in which an inorganic filler is mixed can be suitably used in that the toughness is increased and the density can be easily adjusted. Since these foams have a moderate elasticity, they can reduce the impact of the nose when the model airplane collides, so that they are safe for the human body, less damage to the model airplane itself, and the durability is increased. In addition, when a straw-type resin tube is inserted, it can be easily fixed to an arbitrary place without an adhesive because of the elasticity. A foamed resin sheet can also be used for the main wing or the tail wing used in the present invention. The foamed resin sheet is lighter than paper and water-resistant, so that it has high durability. As the foamed resin sheet, resin foams such as foamed polystyrene, foamed polypropylene, and foamed polyurethane can be used. Particularly, in order to prevent the blade from breaking, a foamed impact-resistant polystyrene sheet containing a rubber component is a desirable foam from the viewpoint of toughness and workability. The thickness of the sheet is 0.3 to 2 mm, preferably 0.5
~ 1 mm. If it is too thin, it has no strength, and if it is too thick, its resistance and weight increase, and its flight properties decrease. Although the fuselage of the model airplane of the present invention can be constituted by one straw-type resin tube, a plurality of straw-type resin tubes can be bundled and used in the fuselage.

Further, the outside of the straw-type resin tube used for the body can be covered with another sheet together with the nose to improve the appearance. In addition, since the body portion of the present invention is a cylindrical resin tube, linearity in up, down, left, and right is maintained. A vertical seat fuselage like a conventional model airplane lacks lateral shape stability. In addition, if the front end and the rear end of the straw-type resin tube of the present invention are opened, an airflow flows in the body during flight, which reduces the resistance and stabilizes the flight performance. However, closing the front end has the advantage of increasing flight speed. Further, if a whistle is provided inside the straw-type resin tube, preferably at the rear end, the whistle sounds during flight of the model airplane, which is preferred by consumers. As the tail mounted on the rear part of the body of the straw-type resin tube, a normal horizontal tail and, if desired, a vertical tail can be mounted. These tails can be fixed directly to the straw-type resin tube with an adhesive or the like. Attachment method of the tail fin is similar to the main wing.First, a foam having an adhesive surface that matches the design angle of the tail wing is attached to the rear part of the straw-type resin tube, and the horizontal tail and the vertical tail are integrated on the adhesive surface of the foam. It is desirable to attach the formed tail unit to stabilize the design angle of the tail unit.

The present invention will be described in more detail with reference to the embodiment model airplane shown in FIG. The model airplane shown in FIG. 1 has a straw-shaped resin tube 5 as a body portion, and a nose portion made of a resin foam molded body 1 shown in FIG. In
A main wing joint surface S as shown in FIG. 2 is provided. The main wing joint surface S is a horizontal plane. A whistle is mounted inside the rear end of the straw-type resin tube 5 (not shown). The back surface of the main wing is fixed to the main wing joining surface S with an adhesive. The wing is the wing joint surface S
The left and right wings are extended in the direction determined by the plane. The main wing joint surface S is from 0 to 30 degrees, preferably 3 to 1 with respect to the horizontal direction from the center line to the left and right good edges.
It has an angle of 0 degrees. This angle determines the elevation angle of the main wing. When the main wing is a foamed resin sheet such as expanded polystyrene, the center of the main wing can be formed horizontally and curved upward from the middle.

An insertion hole V penetrating below the main wing joint surface S of the resin foam molded article 1 of FIG. 2 is provided. Since the insertion hole V is slightly longer than the width of the main wing, the straw-type resin tube is not exposed on the bonding surface between the main wing and the resin foam molded article 1, and thus does not hinder the adhesion. A groove M is formed in a portion forward of the main wing, and the tip 9 of the straw-type resin tube inserted into the insertion hole V is exposed to the outside. Insert the straw-type resin tube 5 with the tail wing into the insertion hole V from the rear of the resin foam molded article 1.
, The tip 9 is adjusted to a predetermined position, and the tip 9 is fixed to the groove M with the string 7. The string 7 can be an elastic band. During the flight of the model airplane, the airflow flows from the tip 9 into the straw-type resin tube 5 to stabilize the straight flight performance of the model airplane. In FIG. 2, if the insertion hole V is a closed hole that does not penetrate, the straw-type resin tube 5
Can be housed inside the resin foam molded body 1. In this case, the air flow is a straw-type resin tube 5.
Does not flow from the tip 9 of the model airplane, but the flight speed of the model airplane increases. As another embodiment of the structure of the resin foam molded article 1 of the present invention, the structure of FIG. 3 is also a preferable embodiment. The resin foam molded article 1 of FIG. 3 is provided with an insertion hole V penetrating below the main wing joint surface S. The insertion hole V does not hinder the main wing from being bonded to the main wing joint surface S because the straw-type resin tube is not exposed over the entire length from the front end to the rear part of the main wing and the resin foam molded article 1. The resin foam molded body 1 can be formed by bonding a left-right symmetric resin foam molded body vertically divided by a line L with a straw-type resin tube interposed therebetween to form a junction between the tip end model portion and the body portion. A model airplane using the resin foam molded article 1 of FIG. 3 is shown in a perspective view of FIG.

The nose portion in FIG. 5 comprises a resin molded body 1a and a joint 1b having a main wing joint surface S.
The joint 1b is fixed by inserting a pin into the pin hole T. In this case, as the joint portion 1b, the front portion H of the joint surface is inclined forward, and the main wing can be firmly fixed when the main wing is curved convexly upward.
Further, in the case of a resin molded body, the impact cannot be absorbed like a foam. Therefore, a shock absorbing rim J is provided at the tip of the nose so that the model airplane does not break due to impact when it crashes. The buffer rim J has a flat plate-shaped rim extending from the tip of the nose to the bottom of the nose in a curved shape to form the bottom of the nose. The middle of the nose is hollowed out to reduce the weight. Further, a lower vertical seat N is provided at the rear of the nose in FIG. 5 in order to stabilize the flight performance. This has the effect of increasing the stability in the straight running direction, and several holes R are also punched out to reduce the weight. In the nose part of FIG. 5, a straw-type resin tube can be inserted, and the pin P can be passed through the pin hole T to fix the straw-type resin tube.

In FIG. 1, auxiliary tubes 8 and 8 ', which are short straw-type resin tubes, are attached in parallel to the straw-type resin tubes of the fuselage at positions on both sides of the main wing joint surface and in contact with the back surface of the main wing 2. Have been. The auxiliary tube increases the width of the joint surface of the main wing to stabilize the shape, and furthermore, the flight performance of the model airplane is further stabilized by the effect that an air flow flows inside the straw-type resin tube during flight. A whistle can also be attached to the auxiliary tubes 8, 8 '. A bellows portion 6 is provided near the tail of the straw-type resin tube 5 in the body portion. By appropriately bending the bellows portion 6, the tail portion can be arbitrarily changed to a shape having a step with the main wing. When the bellows portion 6 is used by being inclined upward at the front portion of the bellows portion 6 and returned horizontally at the rear portion, the horizontal tail can be formed in a stepped state above the main wing. Further, by manipulating this inclination, the horizontal angle of the tail can also be changed. These design changes are possible just before the flight. Since the straw-type resin tube 5 of the model airplane in FIG. 1 is made of polypropylene resin, the hinge effect and the shape of the bellows portion can be freely changed and restored. In FIG. 4, when the bellows portion 6 is reversed and used inside the nose portion at the tip, the straw-type resin tube is firmly fixed inside the nose portion inside the nose portion. The tail of the model airplane shown in FIG. 1 can be manufactured by preparing in advance a horizontal tail 3 and a vertical tail 4 attached thereto, and bonding the tail to a rear part of the straw-type resin tube 5. This bonding can be performed on the resin foam molded body in which the straw-type resin tube 5 is fitted, similarly to the main wing 2 at the nose.

[0013]

According to the present invention, since the straw-type resin tube body is used, the nose portion, the main wing, and the tail wing can be attached to the body so that it can be easily manufactured. In particular, since the body is formed of a straw-shaped resin tube that is lightweight and has a stable linearity, flight characteristics are stable. According to the present invention, the main wing shape of the resin foam molded body 1 having the main wing bonding surface can be stably attached as designed by the main wing bonding surface, so that flight performance is stabilized. Since the resin foam molded body 1 is located at the nose, the impact of the collision of the model airplane can be buffered, so that the human body is safe and the model airplane can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view of a model airplane according to an embodiment of the present invention.

FIG. 2 is a perspective view of a resin foam molded article used for the nose of the model airplane according to the embodiment of the present invention.

FIG. 3 is a perspective view of another resin foam molded article used for the nose of the model airplane according to the embodiment of the present invention.

FIG. 4 is a perspective view of a model airplane using the resin foam molded article of FIG. 3;

FIG. 5 is a perspective view of a resin molded body used for the nose of the model airplane according to the embodiment of the present invention.

FIG. 6 is a perspective view of a conventional model airplane.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 resin foam molded article 1a resin molded article 1b joint 2 main wing 3 horizontal tail 4 vertical tail 5 straw type resin tube 6 bellows section 7 string 8, 8 'auxiliary tube 9 tip of straw type resin tube A nose section B body section C Vertical tail D Main wing E Horizontal tail F Weight S Main wing joint surface V Insertion hole M groove L line T Pin hole H Main wing joint surface front J Buffer rim N Lower vertical seat R Hole P pin

Claims (6)

[Claims] 1. A straw-type resin tube as a body portion,
A nose portion having a main wing joining surface made of a resin foam molded article or a resin molded product is attached to a front portion of the straw-type resin tube, and a wing is attached to an intermediate portion of the straw-type resin tube via a wing joining surface of the nose portion. A model airplane having a tail wing attached to a rear part of the straw-type resin tube attached thereto, wherein the straw-type resin tube is inserted and fixed in a hole provided in a nose part, and a wing is provided on a nose part of the nose part. A model airplane characterized by being fixed to a main wing joint surface of a resin foam molded article. 2. The model airplane according to claim 1, wherein the straw-type resin tube is made of polypropylene resin. 3. The model airplane according to claim 1, wherein the main wing, the tail wing, or the nose is made of expanded polystyrene or rigid expanded polyurethane. 4. The model airplane according to claim 1, wherein bellows-like irregularities are provided in an intermediate portion of the straw-type resin tube. 5. An auxiliary straw-type resin tube which is short in parallel with the straw-type resin tube of the body part.
The model airplane according to 2, 3, or 4. 6. A straw-type resin tube having at least one whistle therein.
Or the model airplane described in 5.