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On the first day when the shield machine was launched, Wang Wenzhou, deputy chief of staff of the Volunteer Army, and Chen Zhengfeng, director of the engineering command post, were present at the scene.The huge steel machine roared, and the pungent fuel smell and dust made Chen Zhengfeng very excited. Although he didn't know what steampunk was, Chen Zhengfeng's feeling when he saw the shield machine was actually in line with that punk style.

"Chief of Staff Wang, I have a bold idea." Chen Zhengfeng said. "Let some tunnels function as road tunnels, and build a straight road between Dongducheon and Paocheon."

"Dongducheon and Paocheon are two supporting towns. Their current road connection needs to take a U-shaped detour to the south of Su Yiyi. The distance is long, and Su Yiyi has a very steep mountain road." Chen Zhengfeng pointed out Looking at the mountains in front of me, "From the foot of Dongducheon to the foot of Paocheon, the straight-line distance is about 10 kilometers, but there are some sections where the road can be built in the middle of the mountain or on the mountainside. We put the position of the 4.2-meter tunnel With a little adjustment, 6 to 7 kilometers of tunnels are used to connect with the mountain road, and a nearly straight road will be repaired.”

Deputy Chief of Staff Wang Wenzhou is also very interested in this plan. "How long will it take?"

"If the 4.2-meter shield machine works at full capacity, and manpower blasting also shares part of the tunnel excavation work, it can be repaired in 8 months to a year."

"Hmm..." Wang Wenzhou is now wondering whether the Ministry of Heavy Industry has a second 4.2-meter shield machine.

……

Hangzhou, Institute of Radar Technology, Ministry of Electronics and Information Industry.

Since the delivery of the two radars of the Hongqi-1 air defense missile, the Hangzhou Radar Institute has been holding back a big move.In the past half a year, the engineers and technicians of the radar institute began to dismantle the radars bought by the Soviet Union on a large scale, and then fiddled with the drawings or telegrams Tang Hua sent from Beijing.Halfway through the project, the Hangzhou Radar Institute could no longer meet the design requirements through disassembly and modification, and had to go to various factories of the Ministry of Electronics and Information Industry in Shanghai and Jiangsu to deploy equipment.

In the past six months, the radar station has unknowingly completed the upgrade from modifying the radar to basically developing the radar itself.

Tang Hua got off the car in Suzhou, joined Chang Qiankun, deputy commander of the Air Force, and Xiao Shaoqing, director of the Air Force Engineering Department, and rushed to Hangzhou together.

After the end of the Dongducheon defensive counterattack, the U.S. military lost its offensive capabilities on the western front. According to Shiji and Awayu's inference, it is impossible to launch a large-scale offensive for at least three months.In mid-June, the shield machine was transported with more than 3 technicians from Fuxin Coal Mine, and Tang Hua was not required to manage the operation.So at the beginning of July, Tang Hua set off for Suzhou-Hangzhou-Shanghai. The research institutes and factories of the Ministry of Electronics and Information Industry in the Yangtze River Delta should have several projects that have achieved results.

"Commander Liu is currently busy with fighter pilots participating in the war in North Korea, but when I came, he talked about the new gadgets of the Air Force many times," Chang Qiankun said, "Commander Liu said that now in North Korea he has to focus on Air defense, he still prefers to bomb people from the sky."

Tang Hua was also happy to hear what Chang Qiankun said, "Yes, yes, bombing is the right way for the Air Force... Speaking of which, the Volunteer Air Force should be able to leave the Qingchuan River now, right?"

Chang Qiankun: "I have already patrolled the Qingchuan River-Andong corridor with Soviet pilots, but the combat experience is not enough. The Air Force has also formulated a plan to extend the patrol area to Anton-Pyongyang, but it is still a few miles away. There is a prerequisite, optimistically, it will be about a few months.”

"Minister Tang, Commander Chang, and Minister Xiao." When they came to Hangdian, the deputy director and staff led the three into the laboratory.

"Is this prototype a full-state machine made completely according to the design plan?" Tang Hua asked.

"Yes, and a ground test was conducted." The deputy director replied.

The door of the laboratory opened slowly, and in the empty hall, there was a dark machine in the center.The drum-shaped main part with a diameter of about 1 meter is connected with a round inverted "small umbrella".

"Commander Chang, Minister Xiao, this is the first airborne radar prototype produced by the Ministry of Electronics and Information Industry. The model name is Type 201 radar. The main part weighs 540 kilograms. It can be installed on the Tu-2 medium bomber."

Chapter 171, Tu-2D Missile Bomber

"The Type 201 radar adopts the C-band, scans the sector at 35 degrees, has two working modes of scanning search and continuous wave tracking, and has a detection range of 60 kilometers for sea-level destroyer targets and 45 kilometers for small boat targets."

Tang Hua touched the metal casing of the 201 Radar, and in his heart gave full marks to the manufacturing process of the Electronics Factory affiliated to Hangzhou Radar.The engineering realization ability of the Radar Institute is also excellent, and the rough structure he proposed is handed over to the Radar Institute for detailed design.In order to reduce the weight and make the detection distance of the radar up to the standard (the detection distance of the airborne radar of this size in this era is no more than 20 kilometers), it is necessary to design a new C-band electromagnetic wave transmitter. In addition, the signal amplification circuit of the radar , filter circuit, have to re-engage.Finally, as an airborne radar, how to keep the radar image displayed on the screen from shaking when the aircraft is dangling in the air is another hugely complicated design.

Chang Qiankun: "Can this 201 radar be tested on Figure-2 now?"

Tang Hua looked at the deputy director, and then replied affirmatively: "It's ok. However, as agreed in advance, if the Tu-2 is installed with an airborne radar, the position of the navigator will have to be cancelled. Air Force training and exercises may have to re-adjust the position of the navigator. bomber to adapt."

Heavy and medium bombers of this era must have had a navigator who told the crew where their plane was going.In this era, there is a simple radio triangulation method, but radio navigation is not reliable and often goes wrong, and navigators need to use maps to match landmarks as an auxiliary positioning mode.In fact, sometimes the navigator's main mode is to look at the map, and the old bad radio navigation is the auxiliary positioning mode instead.

Since it is necessary to align the landmarks, the navigator's seat of Tu-2 is below the pilot, on the lower half floor, and has an observation window with a good downward view.If flying during the day, the navigator's job is to hold a small booklet of maps in his hand, and then stare at the ground with wide eyes.I flew over a river, and I checked which river it was on the map; I flew over two connected mountains, and I checked which mountain it was on the map, and guided the plane to the place it should go all the way.At the same time, the navigator also wears a large earphone and listens to the radio signal for direction finding.Only when flying at night, the navigator only relies on radio positioning.

"Of course, the Air Force has known for a long time that we have obtained the project description and modification plan," Chang Qiankun said, "Mr. Tang, you may not have guessed that we have already removed the things that should be removed from a Tu-2. , just wait for the 201 radar to come out and install it.”

Several jeeps escorted the truck carrying the 201 radar prototype into the air force base. The heavily guarded hangar slowly opened the door, and a Tu-2 with its "jaw" removed was parked in the hangar.The position of the chin is the original position of the navigator, and the original glass cover with a wide field of vision and the degree of the navigator's seat have been removed.

The technicians and engineers of the Air Force Engineering Department immediately started to install the radar. Tang Hua, Chang Qiankun, and Xiao Shaoqing were chatting outside the hangar.

"Minister Chang, the prototype of the airborne radar has come out, but the development progress of the air-to-ship missile is still at the stage of the principle bomb." Tang Hua said, "The unguided flight test of the missile will be carried out after a while, and then the flight mode will be controlled... …It may take the first half of next year to carry out full-state shooting at sea. So in fact, there is plenty of time for testing and improvement of the airborne radar. The goal of this installation test is also very simple, as long as the radar is installed. -2 The bomber can take off and land, just don't be top-heavy and fall down in the air."

"That's not necessarily the case," Chang Qiankun said confidently, "Our guided bomb development went well last year. I think it's okay this time too..."

Tang Hua was speechless... so he could only smile in accordance with the atmosphere.

Looking back at the hangar, the 201 radar has been unloaded from the truck. Seven or eight Air Force technicians pushed the radar with a trolley until it was pushed under the removed chin of Tu-2, checking for the last time whether the interface and the bolts match.

Figure-2, the mass-produced twin-engine propeller medium bomber of the Soviet Union during World War II.The performance and combat positioning are comparable to the American B-25. It was put into use in 1942, and it can be seen in every battle of the Soviet army after 42 years.In the Battle of Königsberg, the Soviet Union dispatched 516 Tu-2s at one time, dropping thousands of tons of bombs, instantly disintegrating the German defense system.Now it is 1951, and Tu-2 is actually quite backward.

But the "backward" Tu-2 in front of me is about to become a miracle in the history of aviation.A propeller bomber in service in the middle of World War II needs to be equipped with a high-precision sea search/tracking radar and two air-to-ship missiles in a modified magazine.Although the range is only 36 kilometers, if there is no air force cover, the vast majority of warships in the world will kneel under this modified version of the Tu-2 missile.

The few who don't kneel are because the warship is too big and too thick to hold it.After all, this air-to-ship missile is a medium/light bomb, and the warhead mass is only 120 kg.

Strolling and chatting on the tarmac, turned to the second lap, and was dragged by Chang Qiankun to the base cafeteria for lunch.When we returned to the hangar, the airborne radar was finally installed, and the black fiberglass radome had just been screwed on.

The technicians dragged the Tu-2 half a meter with a trailer, let the wheels sit on the measuring instruments, and detected the change of the center of gravity of the aircraft after the modification.

At this time, Tang Hua discovered that even the bomb bay of this Tu-2 had been modified.

"The bomb bay and hanger...are also according to the modification plan?"

Xiao Shaoqing: "Of course, look, we also made two model missiles."

Following Xiao Shaoqing's gaze, Tang Hua noticed an object covered with canvas in a corner of the hangar.Uncover the cloth in the past, sure enough.Blunt bullet head, muscular cylindrical body, four trapezoidal main wings, and four triangular small tail fins.

...The Air Force is really impatient.

The center of gravity is measured, the external power supply is turned on, the radar is normal, there is no "bang" or smoke.

Next, you can fly the plane and make a circle in the sky. If it can land safely and the radar shows normal when it is powered on, today's flight test will be OK.

……

"Lao Jiang, calm down, you have to go up there yourself if it's not the first flight of the prototype?"

"The engine of the plane hasn't been changed, so it's fine. Besides, I'm not the pilot."

Chang Qiankun got on the plane, sat in the position of the radar operator, closed the door, and Tu-2 was ready to take off.

There was nothing wrong with the plane, it rolled normally on the ground, and when it was almost at the end of the runway, it rose from the ground.

"The flight altitude is normal, the speed is normal, the engine speed is normal, in short, everything is normal." Chang Qiankun's voice was on the radio, "Since everything is normal, I will fly to Taihu Lake for a while, Minister Tang, the radar you mentioned can be used Yes, don't talk big."

Tang Hua: ... "Commander Chang, haven't you already arranged a detection ship in Taihu Lake?"

"Yes, both ships have added that corner reflector, one is bigger and the other is smaller."

Tu-2 quickly disappeared in the sky, only Chang Qiankun chattered on the radio.

"Look at the track, Taihu Lake is approaching, I'm going to activate the radar!"

"The radar is working. The display is normal."

"I seem to be able to distinguish the outline of Taihu Lake from the radar screen! This is amazing!"

Tang Hua: "Yes, when the radar scans the land, there will be some radar echoes and cluttered signals caused by fine metal objects, especially on densely populated land. And if there are no ships on the water surface, there will be no surprises. The radar reflects the echo. Therefore, the area with dense bright spots is land, and the area with few or no bright spots is water."

"It can be distinguished, and the detection ship with the corner reflector will definitely be able to distinguish it....I see, two very obvious bright spots."