Xiao Weiguo continued: "If we only think about it from the perspective of damage, we will all hope that the warhead of a single-shot rocket is as powerful as possible. However, increasing the power of the warhead will lead to an increase in parameters such as the amount of explosives, the mass of the warhead, and the diameter and length of the warhead. If the mass of the whole bomb is constant, increasing the mass of the warhead requires reducing the mass of the charge of the rocket engine and propellant, thereby reducing the maximum range. If the range index remains the same, while increasing the warhead, it is necessary to increase the propellant charge and the mass of the rocket engine, which will lead to an increase in the mass of the whole bomb. ”

Fred asked, "But how can we increase the power of the warhead without increasing the mass of the whole project?"

Xiao Weiguo said with a smile: "If there can be no big changes in the indicators such as bullet diameter, bullet length and mass range, the only way to improve the power of the warhead is through reasonable structural design, the type of explosives and the selection of shell materials." It is important to know that the probability of damage to a target is not only determined by the power of a single warhead, but also by the dispersion of rockets and the number of rockets fired in a salvo. If the rocket has a large dispersion area and the number of salvos is small, the warhead can only be increased to increase the probability of damage. If the dispersion of rockets is small and the number of salvos fired is large, it is enough for the power of the warhead to reach a certain index, and continuing to increase the power index of a single warhead will not significantly improve the damage efficiency. According to the indicators of our 130-mm rockets, the weight of the warhead is from 10 to 15 kg. ”

Karl nodded and said, "Philip, you can tell us more about the density indicator!" “

Xiao Weiguo said loudly: "The density index is also one of the most important indicators of rocket artillery. It is an indicator of the size of the rocket's dispersion. Different types of rockets have different ways of measuring the intensity indicator. For example, if we make a single-shot individual anti-tank rocket, it must be measured by the target density index, while the field rocket is measured by the ground landing point density index. The density index is one of the main factors affecting the damage efficiency. In the case of a certain accuracy, warhead power and projection volume, increasing the density index can increase the destruction efficiency of rocket artillery in most cases. ”

After a pause, Xiao Weiguo continued: "Only when the field rocket is used to deal with surface targets with a small distribution range, and the accuracy index is low, and the density reaches a certain value, continuing to increase the density index may reduce the probability of damage. However, due to the fact that the rocket density index is still at a relatively low level compared with the barreled artillery. For rocket artillery weapon systems, increasing the density index can effectively increase the probability of hitting or destroying. Therefore, as far as it is technically feasible, we should all increase the intensity of rockets as much as possible. ”

Karl stared at Xiao Weiguo and said, "What should we do to improve this density indicator?" ”

Xiao Weiguo said: "There are many factors that affect the rocket density index, not only many random disturbance factors, such as muzzle disturbance, thrust eccentricity, dynamic and static imbalance and gusty wind, etc., all have a great impact on the density index. As far as rockets are concerned, the use of technical measures such as rotation around the longitudinal axis and optimization of internal and external ballistic parameters in the design and manufacture of rockets can greatly improve the rocket density index. If you think about it from the point of view of combat use. When the density index needs to be higher, technical measures such as simple control and ballistic correction can be adopted. Of course, it is also necessary to consider factors such as production costs and cost-effectiveness ratios, and whether it is necessary to increase to a certain extent. ”

As soon as Xiao Weiguo explained this, the designers of the design group had a deeper understanding of the design and development of rockets, and they originally thought that rockets were a very backward weapon, but now it seems that it is entirely possible to surpass body-barreled artillery.

Xiao Weiguo saw that everyone was recording carefully, so he continued: "Of course. There is also a very important indicator, that is, the reliability index of rocket artillery. It uses safety reliability indicators and functional reliability indicators. The safety and reliability index is an indicator that reflects the safety of rockets in production, storage, transportation and use. Propellants are used in the development and production of rockets. Of course, liquid propellants are used, but we will use solid propellants, which are more convenient and reliable. In addition, there are dangerous goods such as explosives and a variety of pyrotechnics, and the high-temperature and high-pressure gas generated in the combustion chamber when the rocket engine is working, if the material selection design and production process are unreasonable. It may cause explosion accidents during production, storage, transportation and use! So it's an important indicator. ”

"The operational reliability index is an indicator that reflects the normal combat role of the rocket in combat. In order to launch the rocket into the predetermined target area, the rocket engine must be able to work normally and reliably, and the rocket must be able to fly stably. Fuzes and pyrotechnics should be able to detonate warheads reliably at the right time. Safety reliability and operational reliability are sometimes contradictory, and improving the safety and reliability of some components may lead to a decrease in functional reliability. For example, if the safety and reliability of a rocket engine is improved, the mass will increase and the range will decrease. The use of a double fuse mechanism in the fuze design to improve safety and reliability may reduce the reliability of the action, such as a dud. Of course, in the event of a conflict, it is necessary to ensure safety and reliability first, which must be paid attention to. ”

Xiao Weiguo said with a smile: "Now everyone may have a clear understanding of the main design indicators of the rocket artillery weapon system, so the last indicator will talk about money." That's the cost-effectiveness indicator. The cost-effectiveness ratio index is a comprehensive index that reflects the combat efficiency and the price and combat cost of rocket artillery weapons. In combat, the use of rockets with excellent comprehensive performance, such as range and power, can achieve high combat efficiency, but the development and production costs will be very high, the price will be expensive, and the adoption of new technologies and new materials will inevitably lead to a large increase in production costs, so the price of this kind of high-performance rocket artillery will be very expensive, and it is difficult to say whether anyone will buy it. Therefore, as a fire suppression weapon, it is advisable to reduce the cost as much as possible, and of course, the performance indicators should not be too bad, otherwise the combat efficiency is too low, and no one will buy it. ”

Karl asked, "So what can be done to make the rocket artillery perform better without raising the cost too much?" High cost-effectiveness? ”

Xiao Weiguo nodded and said, "Of course there is a way." For example, the development of rocket artillery must be developing towards long-range. The use of high-energy solid propellants, such as the addition of aluminum powder, significantly increases the specific impulse. Lightweight shell materials are used, so that the weight of the shell decreases, the propellant weight increases, and the firing range increases. In the future, our goal is to increase the range of 130 mm rockets to 30 kilometers, which is entirely feasible. (To be continued.) )