Autogyro on lunge. Drawing, description

MODELING
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Autogyro on lunge. Tips for a modeler

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The model is made in cord version. In this case, its adjustment is easier than free-flying. The design of the autogyro is quite simple. The fuselage, landing gear, plumage, engine mount - as in a conventional cord model. A three-bladed propeller creates lift by rotating from the oncoming air flow, that is, it uses the phenomenon of autorotation. However, the number of blades can be three, four or more.

The fuselage (Fig. 1) of a type-setting structure, assembled from plywood frames and pine stringers. The basis of the bow is the most lightweight beech engine mount. The fuselage is rectangular in front and hexagonal in the tail. The bow frame is made of plywood with a thickness of 2,5 mm, the rest - 1 - 1,5 mm. From the sides, the nose part is sewn up with plywood 1 mm thick, at the point of transition of a rectangular section into a hexagon, foam fairings are made. At the top of the fuselage, two guides made of a duralumin corner with a section of 10x10 mm are glued on epoxy resin, on which the bracket for the main rotor mount is installed.

The plumage is a type-setting structure, ribs are made of lime veneer 1 mm thick, edges and spars are made of pine. The profile of the stabilizer is symmetrical, its relative thickness is 9%. The steering wheel is turned to the right by 15 °.

Chassis tricycle, with a nose wheel. Front rack made of OBC wire Ø 3 mm, rear - Ø 2,5 mm, struts Ø 1,5 mm.

On the left side of the model, a small wing is attached, in which there is a duralumin rocking chair 1 mm thick and rods for attaching a cord made of steel cable Ø 1 mm (Fig. 2). The axis of rotation of the rocking chair is located 10 - 15 mm behind the center of gravity of the model. The wing made of D16T duralumin, 0,5 mm thick, is glued into the fuselage on epoxy resin.

Engine "Flight", converted into a compression version; power 0,35-0,38 l. With. with a working volume of 5,6 cm3.

The tank with a volume of 40 cm3, which is typical for a cord model, is located immediately behind the front fuselage frame.

The model is pasted over with colored mica paper.

Main technical characteristics:

Weight, g - 1100
Weight per unit area of the screw disk, g/dm2 - 7,1
Weight per unit area of blades, g/dm2 - 75
Blade area, dm2 - 14,8
Stabilizer area, dm2 - 8,6
Specific weight, kg / hp - 3

Rice. 1. General view of the model (click to enlarge): 1 - guide, 2 - stringer, 3 - plywood plate, 4 - motor mount, 5, 7 - frames, 6 - stringer

The main rotor is the most complex part of the model. Blades of a type-setting design. 1 mm lime veneer ribs, pine edges and spars. The profile on the blades is flat-convex, with a relative thickness of 10%. The metal parts of the main rotor are mainly made of D16T (Fig. 3). Bearings are used for ease of rotation. The main rotor attachment unit provides adjustment of the angle of inclination of its axis and the installation angles of the blades. The node itself can move along the fuselage along the grooves in the guides, this makes it possible to change the position of the center of gravity of the model relative to the axis of rotation of the propeller.

The angle of inclination of the screw axis (within 3-10 ° to the vertical) is regulated by moving the plate forward or backward, into the hole of which the lower end of the axis enters. The setting angles of the blades are changed in the range from -5° to +5° by means of an adjusting nut, which moves the disc with drivers along the vertical axis and simultaneously rotates all three blades. The disk is pressed against the nut by a spring. The blades are attached to the hub with M3 screws.

Autogyro on lunge
Rice. 2. Control system: 1 - M3x12 screw, 2 - rail, 3, 7 - M3 nuts, 4 - washer (textolite), 5 - rocker, 6 - wing, 8 - M3x20 screw, 9 - elevator rod

Rice. 3. Main rotor attachment assembly (click to enlarge): 1 - guide, 2 - bracket, 3 - plate, 4, 13 - axles, 5, 12 - bearings, 6 - glass, 7 - spring, 8 - disk, 9- - adjusting nut, 1L - blade, 11 - propeller hub, 14 - M3x10 screw, 15 - nut, 16 - leash, 17 - earring, 18 - M2x5 screw, 19, 22 - M3x8 screws, 20 - M3x16 screw, 21 - nut M3

The autogyro is launched in the same way as a conventional cord model. It is desirable to carry out the first flights on shortened cords (10-12 m). In case of longitudinal instability, that is, the model swings in the longitudinal plane, it is necessary to move the center of gravity of the model forward (move the bracket along the guides back).

If the model descends very quickly after stopping the engine, increase the setting angles of the blades. The speed of rotation of the main rotor is controlled by small changes in the angle of inclination of its axis. As the angle increases, the speed of rotation increases.

Authors: B.Gorshkov, I.Skiba

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