In fact, increasing the length of the barrel of a tank gun was originally the easiest way to increase the power of a tank gun.

The velocity of the shell flying forward comes from the work of the high-pressure gas inside the barrel, and when the shell is pushed out, the remaining gas will fly out of the muzzle, forming a fireball at the muzzle.

In fact, all this energy is wasted, and the fireball that comes out still contains a huge amount of energy.

If you want to continue using this energy, you need to lengthen the barrel and continue to let the shell be pushed by high-pressure gas, so that the speed can be increased even more.

Therefore, if you consider it from this point of view, it seems that the longer the barrel of the tank gun, the better.

But considering the actual situation, it has to be combined, although the longer the barrel, the more work the propellant does in it, but at the same time, the longer the barrel, the heavier the barrel will be.

This is a very important indicator, after all, the turret is to rotate, and if the barrel is too heavy, it will not turn too fast, so that in case of emergency, it will not be possible to quickly aim and shoot.

On the other hand, it is the obstacles encountered in the march, the barrel is too long, and when traveling in some dense forest areas, it will be more obstructed, so these all restrict the unlimited increase in the length of the barrel.

Now that we have introduced the original L7 tank gun, we need to change it if we want to loosen the export restrictions on this tank gun.

The purpose of Zhu Lao's coming here is to solve this matter.

Increasing the length and solving the so-called exit obstacles, for everyone in a machine factory, it was as if they were in a dense dark cloud, and suddenly a crack was split, and the golden light shone down, and everyone's heart began to become warm.

"That's right!" Ma Panshan slapped himself on the thigh at once: "Our self-developed tank gun, this is our self-developed tank gun!" Zhu Lao, you say, how can we change it? ”

Zhu Lao was originally a well-known artillery expert, and now his empty sleeve is because of an accident during the test of artillery, and now, he, an artillery expert, is personally in charge, naturally to preside over this specific improvement meeting.

It has been determined that it will be reshaped, so how exactly will it be changed?

"This change must be cautious, so we are going to brainstorm today, and at the same time, I will go to the second machine factory and have a second discussion with the capable officers of the second machine factory." Zhu Lao said.

A tank gun, when designed, must have been the result of many compromises, and now, the British L7 tank gun can become the NATO standard, it must be expedient in all aspects, and if you change it, it will destroy this balance.

Maybe it's getting better and better, or maybe even getting worse?

"Zhenhua, can you tell everyone what you think?" At this moment, Zhu Lao spoke.

The idea of this change was proposed by Qin Zhenhua, and now he is sitting at the back, and he still has not escaped Zhu Lao's eyes, and Zhu Lao is looking forward to Qin Zhenhua opening his mouth to talk about his thoughts.

"Ahem, ahem." Qin Zhenhua cleared his throat and said the second sentence, which was even more surprising than the previous sentence.

"If I had to say, how about adding five centimeters?"

Everyone's eyes were about to fall off.

The artillery is all in terms of multipliers, and now, the tank guns imported from Britain are already 51 times the diameter, we have to change it, how can it be longer, for example, change it to 56 times the diameter, or even 60 times the diameter?

What do you mean by adding 5 centimeters? That's not even 1x the diameter!

(Hua Dong Zhixiong consulted a lot of information, and all kinds of sources are different, even contradictory, which is of course also caused by the fact that the British have too many classifications of L7 tank guns.) A lot of information, directly used the information of the later L7 tank gun, the length of this gun is close to 6 meters, this is obviously not the data of the tank gun exported to us in the seventies, after all, when we improved to the 94 type, it was only 6.3 meters, it is said that the introduction is the L7 / M68 type, I did not find this data, I took the L7A3 tank gun of the Leopard 1 tank, it is 51 times the diameter, and the length of our Type 83 tank gun is about the same, this should be the length of the early L7 tank gun, and, Type 83 is a modified and lengthened version, as for how much longer? It's definitely not as long as 94, so just take 5 centimeters, if you know the specific data, welcome to the East China Zhixiong correction. The confidentiality of domestic information is too good to be found. ）

Zhu Lao showed an approving look.

"Different body tube lengths will have different ballistic characteristics, and after we rashly lengthen them, it will definitely bring about great changes in other data." Qin Zhenhua said: "So, now we only need to solve the problem of the export agreement, a little longer by five centimeters, it will not have much impact on the trajectory, so that we can correct the firing table, which is also the easiest problem to solve at present." ”

Lengthening the barrel to gain greater power is the way to develop tank guns, but different lengths mean different ballistic characteristics, which means that the fire control system must be adjusted accordingly.

People don't wait for years to toss.

Therefore, Qin Zhenhua put forward this plan, let's increase five centimeters first, play word games with the British, export to make money first, and talk about it later!

"If you think about it in the long run, in order to further increase the depth of penetration, I suggest that we can increase the length of the barrel to more than 6 meters, so that the armor-piercing ability can be greatly increased, after all, for us, there is no deepest, only deeper, of course, this program, it is estimated that it will take ten years."

As far as military research and development is concerned, ten years is not a long time, and it has been more than ten years since the 100 slippers have been tinkering, and as for the planned 120 mm smoothbore guns, they have also made psychological preparations for a protracted war.

Zhu Lao nodded: "That's right, this is also my idea, after we introduced the original L7 tank gun, while producing at a low speed, thoroughly understanding the technology, while carrying out innovative research and development, completely turned into our own products, and at the same time, in order to solve the export problem, so, it is divided into two parts: short-term goals and long-term goals." ”

Zhu Lao was very satisfied with Qin Zhenhua's analysis, and he had the same thoughts as himself.

"In the near future, it is only a slight change to circumvent the protocol, and in the long run, it is necessary to increase the length of the barrel to increase the power of this tank gun by more than 50 percent, and once there is a problem with our self-developed 120 mm smoothbore gun, it can be topped."

I wish the old man to stand tall, see far, and after improving the power, it is also used as a substitute for his own self-developed 120 mm tank gun, after all, the risk of self-development is still very large.

After some research, we have unified our thinking and built up our confidence again.

"Zhenhua, you called my old man all the way over, but as a result, I don't seem to have done anything." After discussing properly, Zhu Lao couldn't help but sigh.