JPH024707Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a model aircraft made by combining paper and balsa wood or other lightweight wood.

[Conventional technology]

2. Description of the Related Art Model aircraft have been known that use balsa wood for the fuselage and paper or thin plastic plates for the main wings. FIG. 1 is a partial diagram of the conventional structure. The body 1 is made by cutting out a plate-shaped balsa wood in the longitudinal direction of the wood grain. The main wing 2 is made by cutting out paper such as Kent paper or a thin plastic board. This main wing 2 is glued to the fuselage 1. A hole 3 for a weight is provided in the body 1, the hole 3 is filled with a weight, and a paper lid 4 is pasted from the outside.

[Problem that the invention attempts to solve]

Balsa wood has the advantage of being lighter than paper and having greater bending rigidity as a material for the body, but it can be easily cut with a cutter etc.
It has the disadvantage that it easily breaks when opened, making it difficult to process. Additionally, when this model aircraft is flown, the nose section made of batsa wood may hit the ground and break when it lands. Furthermore, in order to attach the main wings 2 to the fuselage 1, the upper surface of the fuselage 1 is narrow, so there is not enough adhesive area. For this reason,
The main wing may separate due to wind pressure during flight or the impact of landing.

Therefore, a model aircraft has been proposed in which the fuselage is made of balsa wood, the entire outer circumferential surface of which is covered with paper or thin plastic, and the main wings are inserted into the fuselage by making vertical grooves (particularly Publication No. 52-112444).

However, if the tail section is pasted with paper or plastic material, the rear part will become heavier and the center of gravity will shift toward the rear, so it is necessary to add even more weight to the nose to adjust the center of gravity, which reduces the overall weight. Due to its weight, its flight time was shortened, and the main wing was a so-called mid-wing type, which had the disadvantage of being inferior to the high-wing type in terms of flight stability as a model airplane.

The present invention improves on this by making use of balsa wood and other lightweight plate materials for the fuselage, making it possible to take advantage of its characteristics, making the fuselage strong and unbreakable, and ensuring strong adhesion between the fuselage and the main wings. The purpose is to provide a model aircraft structure that is light in overall weight and has excellent flight time and stability.

[Means for solving problems]

The present invention is characterized by attaching a plate material, which serves both as a main wing mounting base and a nose side reinforcement plate, to the nose part of the fuselage, which is cut out in the longitudinal direction of the grain of lightweight wood.

That is, in the present invention, a paper board including a convex part that is bent and becomes a main wing mount is attached to at least a part of the side surface of the fuselage including the main wing attachment position, and the paper board is attached to the convex part and the cutting edge of the trailing edge of the main wing attachment position. The structure is characterized by a structure in which the outer circumferential shape of the body is attached so as to match the outer circumferential shape of the body, and the body and the plate are provided with holes of the same shape for attaching weights that pass through them in common. .

[Effect]

The fuselage is made by cutting out balsa wood, and paper members are pasted on both sides of the fuselage up to the trailing edge where the main wings are attached, serving as the main wing mounting base and reinforcing the balsa wood in the fuselage.

This creates a model aircraft that is lightweight, strong, and has excellent flight time.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a partial view of the structure of an embodiment of the present invention. The body 1 is made by cutting out a thick plate of balsa wood in the longitudinal direction of the wood grain. Kent paper boards 5 are attached to both sides of the nose of the fuselage 1, respectively. That is, this paper board material 5 is provided with a convex portion 6 that serves as a main wing mounting base in a part thereof,
The convex portions 6 are each bent outward. Further, the outer circumferential shape of this paper board 5 is made to be equal to the outer circumferential shape of the nose portion of the fuselage 1, except for the convex portion 6 and the rear portion 7 which is the cut portion. These two plates 5 are attached to both sides of the body 1 by gluing to the inner front surface of the plates 5 so that their outer peripheral shapes match.

Reference numeral 3a in FIG. 2 is a mark indicating the position of the hole 3 for the weight. After the plate material 5 is attached to the body 1 and the adhesive hardens, the hole 3 is formed using a cutter knife, a drill, or the like.

With this structure, even if you use a cutter knife etc. to make the hole 3, the balsa wood of the body 1 will have cracks along the wood grain because the paper has a high tensile strength. Nothing happens.

FIG. 3 is a partial view of the structure of an embodiment of the present invention. The convex portion 6 is bent and the main wing 2 is glued. At this time, if the area of the convex portion 6 is kept large, the bonding area between the main wing 2 and the fuselage 1 will be large, and the bond will be strong.

A weight is stuffed into the hole 3, and a lid 4 is covered from the outside and glued. The lid 4 is made of the same type of paper board as the board 5. The lid 4 is glued.

Originally, the rear part did not need as much strength as the nose. If the plate material 5 is attached to the rear part, the center of gravity will shift to the rear, and in order to adjust this, it will be necessary to further increase the weight at the nose, which will increase the overall weight and shorten the flight time. It is sufficient to reinforce the plate material 5 up to the edges.

The main wing 2 and the plate 5 may be made of various thin plastic plates in addition to paper.

Further, in the above example, a hole for a weight is provided in the fuselage 1, but the hole for a weight may not be necessary due to the weight balance of the entire fuselage. In addition to this, holes for wheels can be made in the body 1.

[Effect of idea]

As explained above, the present invention makes it possible to use lightweight and highly rigid balsa wood as the material for the fuselage by attaching a plate material that serves as the main wing mount and the nose side reinforcement plate to the nose of the aircraft. Therefore, a model aircraft structure with high strength can be obtained.

With the structure of this invention, the fuselage will not split along the wood grain during construction, the nose will not be damaged by the impact of landing, and the main wings will not be torn off by wind pressure during flight. In addition, it is possible to create a model aircraft that has a long flight time by reducing the overall weight, and has excellent stability because it can be made into a high-wing model aircraft.

Furthermore, the structure of the present invention has a greater degree of freedom in machining, such as drilling holes in the fuselage, making it possible to create various shapes.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a conventional example. FIG. 2 is a partial view of the main parts of the structure of the embodiment of the present invention. FIG. 3 is a partial view of the main parts of the structure of the embodiment of the present invention. 1... fuselage, 2... main wing, 3... hole for weight,
4...Lid, 5...Paper, 6...Convex part that becomes the main wing mounting base.

Claims (1)

[Scope of Claim for Utility Model Registration] In the structure of a model aircraft in which the fuselage is composed of lightweight wood members cut in the longitudinal direction of the wood grain, and the main wings are glued to the upper fuselage, from the tip of the nose on the side of the upper fuselage. A paper board that includes a convex part that is bent and becomes the main wing mounting base extends up to the trailing edge of the main wing attachment position. The model has a structure that is attached to match the outer circumferential shape of the body, and the body and the plate are provided with holes of the same shape for attaching weights that pass through them in common. Aircraft structure.