Xiao Weiguo said: "Now the Soviet Union and Germany are actually researching rocket artillery, but their progress is relatively slow, and they still have a lot to break through in technology." In the eyes of the German Wehrmacht officers with the idea of military revolution, the rocket has the advantages of simple gun structure, low cost, and the ability to throw a large number of large-caliber ammunition at the enemy's position in a short period of time, and can be quickly towed away from the position by the vehicle after firing. However, limited by the technical level at that time, compared with the barreled artillery, the true range was short, the trajectory was unstable, the hit accuracy was poor, a large amount of smoke was produced when fired, and it was easy to be countered by the enemy, which made the rocket artillery in a relatively embarrassing situation in the German armament rearmament. These were the result of the fact that German rocket technology was not mature enough. ”

Karl was pleasantly surprised: "Philip, you mean, you can solve the current technical problems of rocket artillery?" ”

Xiao Weiguo nodded and said, "Yes, I have a better way to solve the current technical problems of rocket artillery." Beginning in 1929, the Department of Weapons Development of the German Wehrmacht, under the leadership of artillery expert Dr. Beck, began to develop rocket-powered weapons, which marked Germany's 6~10 years ahead of other countries in this field. At the rocket research station at the Kumedorf Artillery Range, Walter Domberg and von Braun began the development of rocket engines. At first, they decided to use rotation to control the flight stability of the rocket, rather than through the tail of the rocket, as the Soviets did. In fact, Britain developed a rotary-stabilized rocket as early as the 70s of the 19th century, but it was not very successful, and the main problem was that the error was too large. The first type of rocket developed by the Kumedov Rocket Research Station has a diameter of about 100 millimeters, weighs more than 10 kilograms, and the launch tube adopts a rectangular frame more than 3 meters long, which is ignited with an electric igniter, and has a maximum range of less than 5,000 meters. Unfortunately. German researchers had the same accuracy problem, with the rocket's impact point dispersion exceeding the military's requirements. Therefore, the bomb was only produced in small quantities and did not enter mass production. Now is the opportunity for our Dragon Soul Ordnance, as long as we develop a rocket artillery that meets the requirements of range and accuracy, which can be launched both on-board and airborne. It can even be installed on warships. ”

Xiao Weiguo also knew that in the history of World War II, that is, in the summer of 1933, the German Wehrmacht specially allocated an artillery battalion to the rocket test station, claiming to be a smoke launch experimental unit in order to keep it secret. In the years that followed, the battalion participated in experiments with 100-mm, 110-mm, and 180-mm rockets, respectively, until the Do38 rocket was successfully finalized in 1937. In 1936, the rocket artillery unit was officially established as a branch of the Wehrmacht, and on the epaulettes and collar badges had the color of its own branch - burgundy. The external name of the smoke launching unit was used until the end of the war. With 100 officers, 332 non-commissioned officers and 1,612 enlisted men, 96 rocket launchers of various types and 484 vehicles, the unit is a small and inconspicuous branch. In 1939, according to the needs of the war. The unit was expanded to four battalions. In the following year, the smoke launch training base was established and expanded to 4 regiments, equipped with 324 Type 41 6-tube 150mm rocket launchers; As well as 1 teaching regiment armed with 280/320 mm heavy rocket artillery. The development of German rocket artillery was not lagging behind the Soviet Union.

Karl wondered: "Then do the Soviets also have the same technical problems?" ”

Xiao Weiguo said with a smile: "That's right! Now it doesn't matter which country is studying rocket artillery. All of them encountered the problem that the accuracy of the rocket was too poor and the actual range was not far enough. The Soviets decided that the use of solid propellants should be used in rocket artillery as the direction of development. The reason for avoiding the use of liquid propellants is that although liquid propellants produce certain advantages over solid propellants in terms of energy and performance, the main disadvantage of using liquid propellants is that they increase the structural complexity of the rocket engine and, at the same time, the cost of the rocket. Solid propellants, on the other hand, have the advantage of being simple and reliable to use, which is very suitable for an artillery weapon that requires a large number of equipment. At present, Germany and the Soviet Union are engaged in rocket artillery in addition to the problems of accuracy and range. The biggest problem is that the shape of their rockets is not very aerodynamic, their rockets are like small gas canisters, short and thick, which really affects the range and accuracy. A truly high-performance rocket should be an elongated body with a pointed tip. From front to back, there are warheads and engine parts, especially the design of the engine tail nozzle of the rocket is very important, the role of the tail nozzle is to convert the heat energy and pressure energy into the kinetic energy of the rocket. Therefore, the tail nozzle can be designed as a kind of opening with a gradually decreasing cross-sectional area, which is similar to our wind and thunder jet engine, when the air flow is sprayed out of the narrow section of the tail nozzle, the volume will expand rapidly, and the temperature and pressure will decrease, so as to obtain extremely high acceleration. In my vision, we want to develop three caliber rocket artillery, namely 90 mm, 130 mm and 200 mm, the range can cover the range of 8 km to 40 km, and the largest 200 mm rocket can have a warhead of more than 100 kg! ”

Karl realized: "It makes sense, but it is just to make the accuracy of rocket artillery higher, what are the specific measures?" ”

Xiao Weiguo said with a smile: "First of all, it is to optimize the appearance. The length-to-diameter ratio of the rocket is larger, and the advantage of this design is that the tail of the rocket is as far away from the center of mass as possible, becoming an arrow-shaped aircraft with great static stability. In this way, the rocket is less sensitive to external disturbances during flight, and the flight stability and ballistic accuracy are improved. Secondly, the rifling of the barrel artillery can be introduced, and a spiral groove that rotates at an angle is designed on each launch tube of the rocket artillery, and a similar projectile belt protrusion is also designed on the rocket to be embedded in the groove, so that when launched, the rocket will rotate rapidly along the bullet shaft at a certain speed to improve accuracy. Another is to use a fast-burning rocket engine to shorten the working time of the rocket engine as much as possible, giving the rocket a higher speed and altitude, and when the rocket fuel is exhausted, the center of mass moves forward, which further increases the static stability! ”

Karl said excitedly: "The advantage of vehicle-mounted rocket artillery is that its mobility is more superior, one vehicle-mounted rocket launcher is equivalent to several self-propelled guns, which is definitely a weapon of war!" ”

In fact, during the Second World War, Germany developed and used the Type 41 150 mm 6-tube towed rocket launcher, the Type 41 rocket 6 fire salvo only takes 10 seconds, the muzzle velocity of the gun is 340 m / s, the firing range is 6000 meters, and the dispersion area is less than 130×80 meters, that is, about 1/46 of the maximum range, this accuracy is enough during World War II. However, the German military considered it to be less powerful and less mobile, and the army was reluctant to use it. The vehicle-mounted rocket artillery can solve the shortcomings of poor mobility brought about by the towed rocket artillery during World War II, and it can be said that it can be able to hit a round of artillery and immediately change a position, which greatly reduces the probability of being hit by the opponent's artillery. (To be continued.) )