In the previous part, Hanhai Wolf Mountain, Xiongnu Wolf Mountain mentioned that most of the medium and large caliber shells, hitting a single or a small area of the target, in the direction of the general problem is not big, even because of the crosswind and other accidental factors deviate from one to two dense positions, but because contemporary shells have been widely used high-performance explosives, the killing radius is very large, and the medium and large caliber artillery is rarely single gun shooting, most of them are seven or eight or even one or twenty guns concentrated fire coverage shooting, so in the direction angle, Basically, it can accurately cover the target orientation set in advance. However, the shells are inaccurate, including multiple artillery salvoes may still be inaccurate, and the most common problem is mainly in the deviation between the prejudged set shooting distance and the actual shooting distance. Recent examples, such as the Yan P Island artillery battle, the south with K9 artillery concentrated counterattack on the north side of the rocket artillery group salvo, most of the impact points in the azimuth angle is no problem, the biggest problem is that almost all of the shells are fired at a point of impact 200 meters to 300 meters more than the target area.
So these counter-fires are of little use. Of course, the rocket artillery group to the north was evacuated as soon as the launch was completed. However, this actual combat case also shows that today's more decent artillery warfare, the distance of the impact point is not accurate, which is the biggest problem of all non-guided artillery. The firing range of large-caliber shells is unstable, and there are many factors affecting it. The amount of propellant loaded, the burn completeness of the propellant, the accuracy of the elevation angle of the muzzle, the actual density of the atmosphere, the change of wind speed and direction, etc., will affect the deviation between the actual firing distance and the prejudged distance of the shell. Therefore, the distance difference between the shell's impact point is far greater than the deviation caused by the inaccurate setting of the shell's dense azimuth. Therefore, experts envision that if the general deviation of the firing angle is not large, as long as the accuracy of the landing distance of the shell is increased by an order of magnitude, the accuracy of the shell's strike will also be greatly improved exponentially. In the three-dimensional space of length, width and height, only improving the distance accuracy is equivalent to only correcting the value of the one-dimensional space of length.
Therefore, shells that only correct the firing range are called "one-dimensional ballistic correction shells". So how to correct the shooting distance of one dimension. There are many ways to correct the landing point of a shell at a one-dimensional distance, such as laser or satellite guidance, by adding effective auxiliary thrust to the shell and increasing the ejection wing of the shell to correct the range and direction. But the immediate consequence of doing so is a sharp rise in costs. The basic international price of large-caliber artillery shells has reached 20,000 to 30,000 US dollars. In this way, the output and consumption cannot be too much, and it is not allowed to let go of consumption. But in large-scale wars, the consumption of such shells started with millions. How to reduce the cost by at least one order of magnitude, or at least half an order of magnitude, the accuracy of the one-dimensional shooting distance can be improved by at least half an order of magnitude, it is necessary to seek a low-cost and efficient approach.
In fact, in order to improve the density of the landing distance of the arrow, the longitudinal distance correction using the resistance correction principle is a low-cost, one-dimensional ballistic correction technology. Based on Newtonian flow theory and wind tunnel experimental data, the method of calculating the expansion resistance coefficient of the one-dimensional ballistic modified elastic resistance ring mechanism is proposed, and through the calculation and analysis of the aerodynamic values of different resistance ring structures, the influence of the exposed height of the resistance ring on the expansion resistance coefficient is much greater than that of the installation position.
Therefore, on all one-dimensional ballistic correction ammunition, a circle of air resistance that protrudes like a bib can be seen in the front of the shell, that is, behind the fuze position. The function of this resistance ring is to make the shell more stable in the flight distance. Although the increase in resistance may make the range slightly smaller, such as from 40 kilometers of normal range to about 37 kilometers, the theoretical flight distance and actual shooting distance of the shell become very accurate almost every shot. In fact, this principle, much like today's torpedoes are flat heads, high-resistance bombs have air resistance rings is similar to the principle. That is, to make ballistic flight more stable and predictable, and ultimately achieve more accurate play without adding much cost!