SU51546A1 - Calculation circle for determining the parachutist demolition - Google Patents

Description

Two methods are known for determining the parachutist demolition: arithmetic and graphical.

The arithmetic method of calculation gives a very fast result, but it is very inaccurate, especially when the winds have different directions at different heights. Graphic calculation is much more accurate, but it takes a lot of time and requires for its production of paper, pencil, ruler, protractor, as well as the table.

In the center of the aerodrome, from where the take-off of ships takes place, there is often no table, no paper, no protractor, or a ruler, which are necessary for solving problems related to the skydiver in a graphic way. Weather also does not always allow the solution of these problems in air.

The proposed device makes it possible to carry out a graphical calculation (exact) under the conditions of a start, without using a ruler, a protractor, etc .; it is only necessary to have data from weather reports, wind direction in degrees and wind speed in MJceK.

Drawing up a graphical calculation using the proposed device

takes a little more time than the arithmetic method, but two to three times less time than the graphic one.

In FIG. 1 and 2 depict the proposed calculation circle in two projections; FIG. 3-7 separate parts of it, of which there are only five; FIG. 8 and 9 illustrate the method of use of the instrument.

FIG. Figure 3 shows a disk 7, divided by 360 and having a window / 2, in which when the device is assembled, indications appear that correspond to the parachutist in meters. The disk / has a notch 14, along the arc of which a scale of 13 is applied for counting at a wind speed of 1, 2, 3.,. , FIG. Figure 4 shows a disk 2 bearing a scale along its circumference, dividing every 5 °. Each scale division has a number that corresponds to a certain relation of the parachutist to the wind in meters. These figures are visible through the cutout / 2 in disk 7 with the instrument assembled. FIG. Figure 5 shows a disk 4, circumferentially circumscribed by divisions 75, as well as parallel lines 76, which make it possible to determine the relative attitude of a parachutist in the wind under various

degrees The disk 4, in addition, has a radial groove in which the rotary sector 3 (Fig. 6) is mounted for movement along it, having degrees (from 0 ° to 90 °) and a handle 17, which serves to rotate this sector. On the same axis with the disks 1, there is a turning line 5 (fig. 7), having divisions corresponding to parallel lines 16 on disk 4.

To explain how to use the calculation circle described above, the following example is given below, explained in FIG. 8 and 9 and the attached weather report.

1. Settlement circle is taken in hand. so that at the top there is an inscription: „Wind direction in degrees (Fig. 8).

 2. The radius of the disk 4 is aligned with 0 ° on the scale of the disk 7.

3. In addition, the calculation circle is taken in the left hand so that the big finger of the left hand is placed on top of it, and all other fingers are on the bottom.

Having the meteorological data, summarized in the above table, first calculate the direction relative to the parachutist in degrees.

The first line of the table shows the wind direction 25 ° and wind speed 5 m / s.

4.Put 25 ° on the scale of the disk / and combine with this division the radius of the disk 4.

5. Then find the difference between the degrees of the first and second rows of the table: 40 - 25 15 °.

6. Against the division corresponding to the scale of the disk 4, the working side is the line 5.

7. The wind speed indicated in the first row of the table, 5 m / s, corresponds to the division of 5 on the scale / 5, applied along the notch in the disk 7.

8. The axis of sector 3 is set against division 5 in the radial cut-out of the disk and rotated so that the working side of the sector is combined with division 6 of the ruler 5.

Division b on line 5 corresponds to a wind speed of 6 m / s indicated in the second row of the table. Thus, a certain angle is obtained between the radius of the disk 4 and the working side of sector 3.

9. The magnitude of this angle is determined by the sector scale. The degree of the angle of sector 3, which coincides with the radius of the disk 4, gives this angle value. Get an angle of 8.

10. The received value of the angle is laid on the scale of the disk /: 25 to the division of 33 ° on the scale of the disk / the radius of the disk 4 is applied.

11. Then there is a difference between the degrees of the third and second row of the table: 57 - 40 17.

12.These 17 are laid on the scale of the disk and the ruler 5 is combined with the point found, as indicated above.

13. The wind speed corresponding to the first line is 6 m / s, put on a scale of / 5 on the disk / and get a point 6.

14. The wind speed corresponding to the second line - 6.5 m / s, lay on a scale on the ruler 5 at the point 6.5.

15. The working side of sector 3 connects division 6 on a scale / 5 disk / with division 6.5 on a ruler 5 and obtains the angle formed by the radius of disk 4 with the working side of sector 3.

16. The resulting angle is determined by the arc scale of sector 3 and added to the previously obtained value of 33 °, i.e. 33-4-f- 9 42 is obtained.

17. I act further in the same way, ultimately receiving the direction of the parachutist. The desired result for this task will be 73 °.

The value of the parachutist relative to the straight line in meters is determined as follows:

18. The calculation circle is taken so that the inscription is on top of it; „Relation in meters (Fig. 9).

19. Sector 3 is placed in an inoperative position.

20. Without moving the disk 4 installed on the angle in degrees, proceed to the further solution of the problem.

21. The first row of the meteorological table table is: 25 ° and 5 m / s.

22. Linear .5 is set against dividing 25 ° on the disk.

The wind speed of 5 m1 sec corresponds to the division on the line 5, indicated by the number 5.

23. Perpendicular line on disk 4, passing through division 5, corresponds to the value on the scale at the radial cut-out in disk 4.

24. The received digit of the AP is found on a scale of 13 disks /.

25. After that, find the corresponding division of this figure on disk 2, which is turned from left to right so as to combine this division with the division of 20 on the disk /.

26.Under 12 discs / reads a result of 65 m relative to the straight line.

27. Then the next line of weather reports is taken: 40 and 6 L1 / s and line 5 is set further to 40 ° on the disk /.

A wind speed of 6 MJceK is noted on line 5 by division 6.

28. Division 6 on a radial scale.

disk 4, corresponding to the line passing through division 6 on the ruler 5, lay on the scale of disk 2 and, accordingly, turn disk 2 until it coincides with division of 20 ° on disk /.

29. Acting this way, ultimately get the figure of 720 m.

Thus, under these conditions, the parachutist will be referred to 73, and its relative will be 720 m.

The subject matter of the invention.

Calculation circle for determining the parachutist demolition, consisting of three discs installed rotatable on a common axis, and of a rotary radial ruler, characterized in that in the radial groove of the upper disc 4, provided with circumferential degrees, and wind scale , a rotatable sector 3 having degrees of division is mounted for movement along the groove, the middle disk / having a scale of degrees division provided with a window for reading relative meters in scale on a scale applied to the lower disk 2, and ruler 5 is equipped with a scale wind, in order to determine the average relative angle and the absolute value relative to the wind speed and its direction at the flight altitude and at several intermediate heights.

to the author's testimony of I. A. Petrov

No. 51546

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to the author's testimony of I. A. Petrov

.No 51546