The door of the courtyard house has been welded dead

"Boom~!"

A deafening sound like rolling thunder shook the shooting range.

Compared to the dull sound of a tank gun firing, the 122mm howitzer is exposed when firing, without any armor blocking it.

People who have never fired a cannon probably don't have any feeling. Only Yang Weimin and Li Feng, who were standing on the side, felt it personally.

Yang Weimin subconsciously obeyed Secretary Li's order. After pulling the rope, he seemed to be lost in thought. When the ground shook, he almost fell down accidentally. Fortunately, Li Feng quickly supported him.

Even though the length of the gun rope during firing is close to five meters, people still feel very uncomfortable within this range, as if all their internal organs have been smashed into 160 pieces by a sledgehammer.

After supporting the big guy Yang Weimin, Li Feng scratched his ears with a grimace, feeling a buzzing sound inside, as if the earwax (to put it politely) was shaken out.

The shooting training ground was also filled with smoke at this time. It was summer and the weather was dry. When Li Feng recovered a little and could hear things, he heard Yang Weimin coughing beside him, and he almost coughed out his lungs.
The same thing happened on the hillside to the right front of the car. After the shells hit the hillside from the ground, there was a sound of shell explosion like thunder. However, neither Li Feng nor Yang Weimin heard it.

The moment the cannon was fired, both of them had temporary tinnitus.

The gray dust on the ground had not yet dispersed when the technicians from the Red Star Factory rushed over. Seeing the huge off-road truck still standing, many people finally breathed a sigh of relief.

They were afraid that the car would be overturned by this shot, which would be a real disgrace to the army.

Fortunately, the worst situation did not happen as expected. When Li Xuewen walked to the car waving his arms, he saw Secretary Li lying under the car.

"Ahem, phew! Phew~!"

After spitting out the thick phlegm with dust in his mouth, Li Feng held onto the edge of the car with both hands, squatted down, looked at the ground from time to time, and tilted his head to look under the car from time to time.

On the ground, puddles of dark brown oil like soy sauce gathered together and were gradually absorbed by the dry earth. It looked as if a bottle of soy sauce had been knocked over at home.

"Where's the oil leak?"

This was the question Li Xuewen asked when he saw it for the first time. Of course, this is also what Li Feng wanted to ask~!

"Put away the hydraulic lever and the hoe. The hydraulic pump of the left rear hoe is broken!"

Regardless of the danger, Master Jia crawled under the car and found the cause of the problem immediately. The hydraulic device in the middle position had its cylinder blown up by a shot. The first two of the four hydraulic rods exposed outside were successfully retracted.

The last two that were installed on the spade, one was slightly deformed, and the other was seriously deformed and could not be retracted at all. At least, that's what Li Feng saw~!

When Master Jia climbed out from under the car, not only his clothes were covered in black, but also his neck, face and hair were covered in hydraulic oil. He crawled out, picked up the wrench from the maintenance tools, and then climbed back in.

The slightly tilted vehicle body returned to its normal posture after the hydraulic rod and the hoe were retracted and the tires touched the ground.

Li Feng's expression looked very complicated. Success was only halfway achieved, but stumbling blocks also appeared. However, it didn't take long before a smile appeared on his face again.

Although they are distressed, they cannot show it. These people have been working overtime for such a long time. None of them have any experience in military artillery, and it is not easy to get to where they are now.

Participating in work with emotion and letting these people see it can easily hurt people's hearts.

"I think it's an angle problem. The baseline of the artillery's aiming is not aligned with the middle position of the two spades. It is quite crooked. The recoil is vertically backward along the gun barrel, which means that the bent spade is bearing most of the recoil. As a result, the hydraulic pump cannot withstand the instantaneous pressure and explodes~!" After carefully studying the truck gun, Captain Bai walked up to Li Feng and tried to explore the basic cause of the problem.

As expected of someone who has received professional training in a military academy, the opinions he gave are in line with the definition of physics. In fact, it is the same when a tank fires, but the recoil can be transmitted from the tracks to the ground by a tank weighing dozens of tons, rather than relying on a spade, so there is no need to consider the direction.

But the truck gun is not like this. The two spades bear the recoil, and this problem will occur if the muzzle aiming line is slightly off.

After all, in previous artillery, the spade and the gun barrel were mechanically connected, and the muzzle steering mechanism would be stuck after reaching the maximum angle. The howitzer that was seated alone on the frame was separated from this internal connection.

To be precise, the U-shaped groove on the front of the vehicle forms a fan-shaped surface, and the direction of the muzzle can only be adjusted left and right within this fan-shaped surface. Once it exceeds the limit of this fan-shaped surface and deviates from the position of the two spades at the rear of the vehicle, it will be like the current situation.

"Hi~!"

"I was careless. It's my problem~!"

The more Li Feng looked at the posture of the gun muzzle, the more he felt that it was like what Captain Bai said.

Looking at the technicians busy at work behind the car, Secretary Li patted his thigh with heartache. He was steering the car at the time because he was afraid that the muzzle would be raised too high and an accident would occur after crossing the hillside.

Now it seems that the effort backfired. No wonder. As far as I can remember, I have never seen the muzzle of a truck gun adjusted left or right to shoot from the side of the vehicle.

It’s not enough to just have the concept. If you want to wade across the river, you have to wet your shoes first.

"It's not that I've done something wrong. Now we know. When we go back, we should either redesign the spade or adjust the muzzle left and right. There has to be a maximum limit~!"

"The artillery is fine, and the connection to the truck chassis system is fine as well. Only the hydraulic stabilization structure has a problem, which can only be said to be one-third wrong~!"

This time it was Captain Bai who came to comfort Li Feng. He patted him on the shoulder, gave each of them a cigarette, and then sat on the ground, watching Master Jia and the others perform emergency repairs.

Yes, that's right, there are still four shells in the open trunk of the jeep. Maybe in Master Jia's opinion, the problem is not too big.

The car wasn't shaken over, which was already very favorable. There are replacement parts for things like hydraulic pumps and hydraulic rods.

……

"The spade is now facing directly behind the rear of the vehicle. If it lands at an outward angle, can the range of left and right adjustment of the muzzle be increased?"

"Not only that, I think the hydraulic rod may still be a little thin. After being extended to the limit, there is no design to recover kinetic energy. It needs to be able to recover some of the sudden recoil, and then slowly release the hydraulic pipe. This is also a way to reduce the recoil. If the hydraulic pump is forced to bear the responsibility, there will be problems with the pipe sooner or later, even if the pump does not have problems~!"

After a busy period, everyone sat next to the truck cannon, holding a small stone in their hands, and used the dirt road as a drawing board to redraw the sloppy design on it.

The conditions were very simple, but the enthusiasm during the discussion showed that after this round of artillery shells, the enthusiasm of the technicians was even higher than before.

At that time, no one understood cannons, and could only guess at how strong the recoil was. People were quite restricted in what they did, and no one dared to take big steps for fear that something might go wrong with their business.

Now, after firing a cannon, a problem has arisen, and we need to find a way to solve it. As long as we can verify that the cannon is on the truck and can be fired, the remaining problems will not be considered problems. (End of this chapter)