Karl smiled, "Ah, Philip, you're a good idea!" I think you have to be the leader of this research team! Nelson, you said yes, right? ”

Nelson also nodded and said, "Exactly!" Mr. Philip is the inventor of the Vulcan Cannon, and he is the only one who knows the design of the Vulcan Cannon! ”

When Philip heard this, he couldn't help but smile bitterly: "This is really a chore!" However, you know that I am now in charge of the design of the jet engine and the development of the M40 transport aircraft, but I am afraid that I will not be able to pull away! So even if I'm the team leader, I'm still nominal, but I can do that by telegraph, and I can do that. ”

Nelson said, "Good! If you have any technical problems in the future, I'll call you! If I can't say anything on the phone, I'll send a telegram, Mr. Philip, and you must reply! ”

Philip laughed, "That's for sure. I also hope that our Vulcan cannon can be developed sooner, so that we have another profit growth point, and it is unique. In addition, after a certain modification, this Vulcan cannon can also be installed on aircraft and become a kind of aviation weapon. ”

Messerschmidt's eyes lit up and he exclaimed, "Is this true?" That's great, then we have to hurry up and get the Vulcan cannon out! ”

Saying that, everyone went to the artillery design room of the R&D center, in the design room of Nuoda, there were more than a dozen designers who were busy, some were drawing detailed drawings of artillery, some were calculating design parameters, and saw a large group of people coming, including chief designer Nielsen and boss Carl, these people immediately stopped their work and stood up.

Karl stretched out his hands, pressed them repeatedly, and said loudly, "Everyone sit down." Today we have Mr. Philip, who is the inventor of the Vulcan Cannon, and you can ask me all the problems you encountered in the design, and let Mr. Philip see what the problems are. ”

A designer, who was only about twenty-five or sixteen years old, asked cautiously, "Mr. Karl, is there any technical problem that you can tell?" ”

Karl laughed and said, "There are no outsiders here. Philip is still a shareholder of our company, and now we have become one of the members of the Dragon Soul Ordnance Consortium composed of Dragon Soul Aircraft Manufacturing Company, BFW Company and Bofors Company, and Mr. Philip is the chairman of the consortium. This is Mr. Messerschmidt, the chairman of the BFW company, so there is nothing to hide, but everyone can raise it, today we are here to solve the problems encountered in the development of the Vulcan cannon. ”

Nelson also said solemnly: "Try to pick up important questions to ask, don't waste precious time." ”

The designer breathed a sigh of relief and exclaimed, "That's good." Mr. Philip, we encountered a serious problem in the process of designing the barrel of the Vulcan cannon, and the strength of the barrel we designed and calculated always failed to meet the requirements in the test, I don't know what is going on! ”

Philip nodded and said, "Yes, I think you may have taken the barrel design parameters of the Vulcan cannon in the same way as ordinary small-caliber guns." So, let me start by talking about some of the concepts of the barrel design. When determining and drawing the theoretical elastic strength limit curve of the barrel, the safety factor of the chamber part of the rotating barrel gun should be taken as 1, and the theoretical elastic strength limit curve from the bottom of the barrel should coincide with the calculated design pressure curve. The safety factor of the rifle part should be transitioned from 1.2 to 2 from close to the chamber to the muzzle, and the safety factor of the muzzle part should be 2. ”

In addition, in the preliminary design, the outer diameter dimensions of the chamber, the maximum pressure point and the muzzle can be determined, which is calculated according to the inner diameter of each place and the elastic limit of the selected body tube material. Then, the shape of the body tube is adjusted according to the overall design requirements. For example, in order to reduce the body tube and the overall mass, and to take into account the strength of the rear of the body tube and the weapon box, the outer diameter of the rear of the body tube should be adjusted to a larger size. Philip said calmly.

Nelson clapped his hands and said loudly: "Look, you always hold on to what you learned in school, you don't know how to innovate and adapt, so we have a lot of technical problems that are actually very simple and can't be solved." Philip, tell us about the characteristics of the internal structure design of the barrel of the barrel of the rotary tube! ”

Philip nodded and said, "Mr. Nelson is right! Those of us who are engaged in weapon design should draw inferences from others and consider problems with divergent thinking. The barrel of the Vulcan cannon is the same as that of ordinary small-caliber guns, mainly including two parts: the chamber and the rifle, which are connected by the slope chamber to form a complete chamber. The chamber is used to contain the cartridge case, and when fired, it seals the gunpowder gas together with the cartridge case to prevent it from leaking. The chamber is generally divided into three sections, the first section is called the first cone, the second section is called the oblique shoulder, and the third section is the cylindrical part, which matches the neck of the cartridge case. Although the basic dimensions of the chamber are the same as those of the cartridge case, we need to design it with the appropriate amount of clearance or interference. ”

A designer in his thirties suddenly asked, "Mr. Philip, we know what you said." However, the size of this gap and surplus is not easy to grasp. ”

Philip nodded, "Not bad!" Let's talk about the gap between the first cone and the cartridge case, this gap is best taken 0.2 to 0.5 mm, and the gap between the second cone and the cartridge case depends on the way the cartridge case is positioned. If the cartridge case is positioned with a bottom edge or a specialized flange, there should be a gap, and if the shell is positioned with a diagonal shoulder, it should be designed with a certain surplus. The purpose of this design is to avoid the failure that the bottom end of the cartridge case moves forward due to the high velocity of the bullet entering the chamber and the compression and deformation of the cartridge case, resulting in the failure of the firing pin to hit the primer. This point is also one of the differences between the rotary tube gun and the ordinary small-caliber rapid-fire gun, because the rate of fire of the rotary tube gun is dozens of times higher than that of ordinary guns. ”

Nelson nodded frequently when he heard this, and quickly asked, "What about the slope?" ”

Philip continued: "The main points of the design of the slope chamber are that the taper should be selected reasonably, and I think that the tapering taper of the rotary barrel gun should be between one-fifth and one-tenth, the length of the groove should be one-quarter to one-double the diameter, and the starting point of the rifling should be two-thirds of its length. This is due to the position of the starting point of the rifling, which is related to whether the guide belt will be embedded in the rifling when the shell is loaded in place, and if it is not properly designed, the projectile of the blind bullet will remain in the rifling, and when it is reloaded, the infeed will be blocked and cause an accident. ”

Philip's in-depth explanation made these designers very rewarding, even Nelson and Carl were also fascinated, and the only one who didn't understand half understood was Messerschmidt. Although he was a master of aircraft design, he did not know much about artillery design.

In his previous life, as the youngest deputy chief designer of the Ordnance Industry Group, Philip had incomparably profound attainments in the design and manufacture of various artillery, and after more than 100 years of development, the artillery had almost reached its peak in the 21st century, and various artillery design forms and theories were very mature, so it still played a very important role in the early advent of the Vulcan cannon in the thirties of the 20th century.