Flying saucers. Drawing, description

MODELING
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Flying saucers. Tips for a modeler

Modeling

Viktor Efimovich Marinov from Rostov-on-Don has been building free flight models since he was young. Lately, when he was in charge of the aviation modeling circle at the regional SUT, he became interested in designs with a disk wing - disk planes. However, he could not achieve good results for a long time - the flying "saucers" turned out to be heavy, clumsy and, most offensively, they did not fly well.

But persistent creative searches eventually led to success - a scheme was developed for a slotted disk flying device with acceptable characteristics.

Models built according to this scheme look rather unusual. Their wing has the most incredible shapes: round, triangular, square and other "geometries". When they take off and begin to soar in the air, you involuntarily wonder: how is this possible? The descriptions of several designs by V. E. Marinov published in this issue, in our opinion, exhaustively answer this question.

To complete the drawing of a slotted diskette, we build a conjugation of a square and a circle, a square and a triangle, etc. A square is a frame on which the entire system of wings is mounted: front, tail, right and left side (Fig. 1). But a disk with a square slot has a significant drawback: weak fastening of nodes at connection points a - d. Therefore, it is recommended to make the gap closer to the front or tail edges of the disk, guided by the following parameters: constants - side wing width (H) D / 7, where D - disk diameter; length (A) 5D/7; variables - the width of the front and tail wings (B) from 3/14 to 3D/7.

Using this data, it is easy to design a wide variety of model systems. For example, a four-winged disc aircraft (Fig. 2). It has good flight characteristics: lightest weight, good climb, stability in flight, ease of manufacture. This system is suitable for the construction of aircraft models of almost all classes. By bringing the width of the front wing to 3D / 7, it is possible to design a cord model.

Its dimensions are from 200 to 850 mm, the structural material is the most diverse, up to paper.

A further development of this system was the addition of a fifth (second front) wing, which is mounted inside the slot. By changing its location, you can create new circuits (Fig. 3-5). All of them, differing from each other in appearance, are equivalent in terms of flight performance.

(click to enlarge)

Rice. 1. Principal diagram of a diskette: 1 - front wing, 2 - tail wing, 3 - right side wing, 4 - left side wing

Rice. 2. Four-winged disc aircraft: 1 - front wing, 2 - tail wing, 3 - right side wing, 4 - left side wing, 5 - stabilizer

(click to enlarge)

Rice. 3-5. Disklets with a fifth wing (second front): 1 - front wing, 2 - second front wing, 3 - tail wing, 4 - right side wing, 5 - left side wing, 6 - stabilizer

Rice. 6. Ring model "Science Fiction Dream": 1 - front wing, 2 - second front wing, 3 - tail wing, 4 - right side wing, 5 - left side wing, 6 - disk, 7 - stabilizer

Rice. 7. Equilateral slotted triangle.

Position designations are the same as in Figure 2.

Rice. 8. Model with front wing in the form of a spear.

Position designations are the same as in Figure 2.

Rice. 9. Slotted square.

Position designations are the same as in Figure 3.

Here is a typical diskette of such a scheme (Fig. 3). The transverse form of the system is trough-shaped. The keel is fixed on the fuselage, tail or second front wing and does not protrude beyond the perimeter of the circle. Aileron, flaps mounted inside.

Of great interest to the guys is the design with a round slot of the middle type - a ring model, which we called the "dream of science fiction" (see Fig. 6).

Its wings have a width of D / 7. In the center is a spherical or flat disk. Optionally, flaps can be made on the second front wing, which must be lowered down (about 5 °). Construction dimensions 350-560 mm. It is desirable to build the front and tail wings profiled, the side wings - a flat profile.

One of the varieties of our slotted systems is an equilateral slotted triangle (Fig. 7). The model is fast. Wings of a thin profile, the tail has a width of 1/7l, where l is the length of the base of the triangle. The fuselage is tubular or truss square section with a length of 1,4-1,5 l. In extreme cases, you can use a motor beam. Push screw, free travel Ø 0,51, pitch 1,5D. When landing, it rarely breaks.

The most popular among the guys is the model with the front wing in the form of a spear (Fig. 8). Optionally, flaps can be made on it. The sizes of such discs are from 200 to 360 mm. Small models are made of thick paper on a simple frame of pine slats or veneer. The base of the side wings, giving them an angle of attack, is smeared with glue for rigidity.

Of great interest is the slotted square (Fig. 9). It flies faster than other models. Screw Ø 0,5D pitch H 1,7D. Without the second front wing, the model is unstable.

Practical recommendations. You can make the wings of slotted diskettes from inexpensive material: pine, linden, veneer, foam, paper. Discs with a size of 300-500 mm are better obtained from polystyrene, and 500-850 mm - inlaid construction, profiled. The wings can be assembled on a simple pine or veneer frame.

To make foam wings, you need a template made of tin or cardboard. It is done like this. Draw on tin or cardboard part of the projected disk. Connect the two points of the circle with a 5D/7 chord and then cut out the resulting template segment.

To harvest the front and tail wings, it must be reduced. The template for the second front wing is rectangular in shape, D/7 wide.

Before starting work on the wings of the disc aircraft, make a full-size drawing of the model and adjust the templates according to it. Then cut out the wings from the foam, sandpaper and give them the selected profile. At the front wings it is normal, slightly concave at the bottom; at the side - flat, thin; the tail one is also normal, but flat from below.

Assemble the model on a slipway board, on which you first make a drawing of a diskette; strengthen the wings along its contour with pins; first tail, then front (putting a match under the toe). Connect them with side wings, giving the appropriate angle of inclination. Lastly, mount the second front fender.

You can glue the model with BF-2 glue, but epoxy is best. The fuselage can be of any design: from a simple motor beam to a typesetting system (for models with a rubber engine, its dimensions are 1,5D, the screws are about 0,5D in 1,2-1,5D increments).

Pull the wing to the fuselage with rubber threads. The center of gravity should be 35-38% of the toe of the disc and depends on the type of "cymbal".

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