Indoor aircraft models. Drawing, description

MODELING
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Indoor aircraft models. Tips for a modeller

Modeling

Room models - small sizes. Simple in design and manufacture. The material for their construction can be dry straw and any grass that is similar in structure to a wheat stalk. Enamel or ordinary nail polish is used as glue. Of the tools, it is enough to have scissors, round nose pliers and a safety razor blade.

The frame of the model is covered with microfilm or thin paper (cigarette, condenser).

Room models, the schemes of which we publish, were built by aircraft modelers in Baku. During the test in a room with a height of 18 m, when starting from the ground, the "flying wing" model of S. Ainadinov stayed in the air for 6 minutes. 54 sec.

Schematic models of the aircraft

Before building schematic models, make full size working drawings. It is more convenient to start making a model with a rail-fuselage.

Rail-fuselage. Cut the power part of the rail from reed, chiy or strong rye straw with a diameter of 4-5 mm. Collect a straw lath for greater strength from two stems inserted into each other (the inner one is pre-lubricated with glue).

Tie a bearing made of sheet duralumin with a diameter of 0,3 - 0,5 mm to the rail with the calculation of the displacement of the screw axis by 3 ° down and to the right by 8 °.

At the rear of the power rail, fasten a 0,5 mm steel wire hook and a 10 mm long straw tube into which the removable tail boom with plumage should be tightly inserted. To attach the wing to the rail, glue two straw tubes 3-4 mm long.

Screw. The hub of the screw is made of chiy or two stalks of rye straw 4-5 mm in diameter, inserted one into the other. Axle made of 0,5 mm steel wire. Insert the blades cut out of semi-wattman paper into the slots of the hub, cut with a safety razor blade at an angle of 45 ° (to increase the propeller thrust, the blades are given a convex profile, and their ends are slightly twisted).

Wing. First, a rectangular part of the wing is assembled - the center section. For this, pieces of straw with a diameter of 1-1,5 mm, intended for edges and struts, are aligned on the bulb of an electric lamp. The ribs are bent according to the drawing. Then the pointed ends of the ribs are inserted into the holes of the edges. The junctions of the straw stalks are lightly cleaned before gluing.

When assembling the center section, make sure that the ribs have the same bend.

The left and right consoles are assembled in the same way, connected to the central part by wires bent at an angle.

The wing is mounted on the fuselage with the help of racks; their free ends are covered with glue and inserted into tubes fixed on the fuselage.

For greater strength, the wing frame is reinforced with struts and braced with a thin nylon or silk thread. So that the rail does not bend from the compression of the wound rubber motor, it is also braced with a thread.

Tail plumage. The keel and stabilizer are assembled from straw with a diameter of 0,5 - 1 mm and fixed on a straw tail boom with a diameter of 2,5 - 3 mm.

Models are pasted over with condenser paper. Rubber motors, consisting of 2 threads with a cross section of 4x1 mm, are lubricated with castor oil.

The flight weight of the schematic model of the aircraft is 8 - 10 g.

(click to enlarge)

Fuselage models

The long flight duration of the fuselage models is achieved due to the low load on the bearing surface and a well-chosen propeller group. To obtain a light construction of models, their parts are made from stems of thin dry grass with a diameter of 0,2 - 0,3 mm, and for rigidity and strength they are braced with truss struts, braces and nylon gossamer thread.

The propeller hubs, landing gear and tail boom are made of thin-walled barley straw with a diameter of 1-1,7 mm.

The described models can be installed on floats. Collect the frame of the floats from thin grass and cover with microfilm. The rear float is attached to the bottom of the keel. The ailerons of the "flying wing", which act as a stabilizer, are attached to the wing with thin aluminum plates at an angle of 12 - 15 ° (with respect to the chord line). This allows you to change the degree of their upward deviation during adjustment.

The design of the front boss, nose and tail parts of the fuselage is similar for the models.

The rubber motor for the aircraft model consists of one thread, for the "flying wing" it consists of two threads of round rubber with a diameter of 1,2 mm. Use shaving cream as a lubricant for the rubber motor.

(click to enlarge)

Model Adjustment

Adjustment of indoor models, in principle, does not differ from the adjustment of conventional motorized models flying in a circle. Gliding flight in small circles to the right is achieved by the deflection of the keel and the difference in the installation angles of the left and right halves of the wing. The left half of the wing is given a negative twist of 4 - 6 °, the right - a positive twist of 6 - 8 °.

On the "flying wing" model, the left half twists negatively by 6 - 8°, the right half - positively by 2 - 4°. In addition, the aileron of the left half of the wing has a smaller upward deflection angle of 2 - 4 ° compared to the right.

Twisting, that is, wing distortions, is carried out by uneven tension of the thread braces or the difference in the length of the wing struts.

With the correct position of the center of gravity, pitching in gliding is eliminated by bending the tail boom down, diving - by bending up. On the "flying wing" when pitching, the aileron slope is reduced upwards and increased when diving.

The right helix on the motor is achieved by shifting the axis of the screw to the right by 12 - 15 ° and down by 2 - 4 °.

To reduce friction in the propeller bearing of the aircraft fuselage model, the axis is deflected to the right and down by shifting the entire power section of the fuselage.

An additional slight deviation of the screw axis is achieved on a schematic model by warping the bearing plates; on fuselage models - by rotating the front boss with eccentric holes.

The rubber motors of the models are twisted from the rear of the fuselage. To do this, in fuselage models, the rear pin has a wire ring.

The main weight and geometric data of the fuselage model of the aircraft: 180 mg fuselage, 250 mg wing, 120 mg propeller, 105 mg tail with beam, 25 mg landing gear, 300 mg rubber motor, flight weight 980 mg, wing area 9,77 dm2, stabilizer area 1,68 dm2, the load on the bearing surface is 0,085 g/dm2, the relative weight of the rubber motor is 0,306, the relative pitch of the propeller is 1,8.

The main weight and geometric data of the fuselage model of a "flying wing" aircraft: fuselage 350 mg, wing 600 kg, propeller 300 mg, landing gear 50 mg, rubber motor 700 mg, flight weight 2000 mg, propeller pitch 1,6, wing area 10,7, 2 dm0,186, bearing surface load 2 g/dm0,350, rubber motor relative weight XNUMX mg.

How to make microfilm

Microfilm is the thinnest, transparent coating, 100-120 times lighter than tissue paper. For its manufacture, it is necessary to have a solution of enamel with castor oil, a bath and a puller frame, curved from 3 - 5 mm aluminum wire.

The solution is prepared in a clean vial with a ground stopper. To do this, 20 g of acetone is mixed with 60 drops of castor oil. Then 80 g of enamel is added to the resulting liquid. The mixture is thoroughly shaken and defended.

Water at room temperature is poured into the bath (a wire frame is placed on the bottom), then the solution is poured in a continuous stream. The faster the contact of the solution with water, the thinner the film will be. Its thickness is determined by color. Thin film transparent, golden-ash color. As it thickens, it acquires bluish-violet, greenish and reddish hues. Thick film - gray, opaque.

After a few minutes, when the film dries, it can be removed from the surface of the water. To do this, the puller is taken by the handle and slightly raised until it touches the film with the entire frame. After making sure that the film lies on the frame everywhere, the remover is carefully removed, holding the frame at an angle so that the water drains from the film.

The film should be removed quickly, but not jerkily.

If the edges of the film still turn up and stick to the main film, they can be carefully moved with your finger to the wire of the stripper (while the film is damp).

The frame is bent according to the transverse angle V of the wing, and the wing frame is applied to the wet film, previously smeared with a weak solution of sweet water.

The film and the place of its gluing with the wing surface dry within 8-12 hours.

After drying, the film is carefully cut with a sharp razor along the edges of the wing. Smaller frames are used to fit other parts of the model.

The process of making and shooting film requires some skill.

During the manufacture of the film, there may be such defects. The film wrinkled and sharply decreased in size. This means that there is little castor oil in the solution. If the film is sticky and viscous, then there is a lot of castor oil in the solution. There are small holes in the film - the solution did not settle, there were air bubbles in it and the oil was poorly dissolved. There are torn holes in the film - the water is poorly cleaned from the remnants of the film. The solution was covered with a white coating - the water is cold.

When re-manufacturing microfilm, the water in the bath must be thoroughly cleaned of film deposits by rubbing the edge of a sheet of paper over the surface.

We recommend interesting articles Section Modeling:

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