After Christmas 1940, Lin Youde put Isabella on the plane back to the front.

After returning from the airport, Lin Youde finally saw Ysera in the office again.

"Actually, you could have come to the office while moms were around, Ysera." Lin Youde sat down in front of his place and said to his daughter, "As soon as your mother comes back, you will disappear from the office or something, it's not necessary." ”

"What if it gets in the way of your interest?" Without raising her head, Isera continued to quickly write her opinions on Wen Jiàn, "Look at Mother Isabella, if I come to see Wen Jiàn while she is here, she will definitely hate me." ”

"Isabella isn't going to have trouble with your kids, is she?"

"It's true, but it's still going to be unhappy, she's so attached to you, daddy, everyone else stays for three weeks and leaves, and she's stuck until the end of Christmas, a full five weeks."

Lin Youde raised his eyebrows and stared at Ysera's face.

"Why, when you were a daughter, you started to eat your mother's vinegar?"

"How is that possible?" Ysera looked as usual, just raised her eyes and threw Lin Youde a "this thing is stupid again" look, "I'm just feeling sorry for the mothers who can only spend Christmas in front." ”

Lin Youde pouted, in fact, when he was talking to the fox yesterday, he was arguing to death, and it seemed that he had left his husband's wife group and had a particularly high play, where did it come from.

Ysera also seemed to think that it was not good to tell her father about this topic, so she directly changed the topic and threw a copy of the text in her hand across the table to Lin Youde: "This is a report submitted by the Air Force, and I can't judge the content of it, so I didn't write anything on it." ”

Lin Youde took a look at the report and found that it was about the previous proposal to patrol the Atlantic Ocean with an airship carrying a new radar and guide air force fighters to intercept a US transport ship bound for Britain. Lin Youde hurriedly opened the report.

The Air Force has carried out the implementation of the new radar, and the effect is indeed there, but the effective detection range is far lower than expected, in order to avoid the airship being shot down and the radar falls into the hands of the British, the airship must patrol far from the British Isles, and at the same time the patrol line must cross the Atlantic route between the United Kingdom and the United States.

The Air Force studied it and found that it was impossible for the existing aircraft to go so far to carry out attack missions, but the new Luftwaffe created by Lin Youde said: This is not difficult for us, we can blow up a piece of ice from the Arctic Circle with explosives, make a floating airfield, and deploy it in a place north of the Atlantic......

Lin Youde laughed directly, and then muttered: "Nonsense." ”

"But it's creative, isn't it?"

"Yes, it's creative, but it's not executable." Lin Youde shook his head and continued, "In war, the most important thing is enforceability. It seems that the idea of using AWACS airships to guide the attack fleet of aircraft groups will be abandoned, but it may be possible to try AWACS airships to guide the attack fleet of submarine groups. ”

"Will the Navy agree?" Ysera looked worried.

Lin Youde couldn't help but sigh.

There has always been a voice within the German Navy that the development of the Navy was neglected because Lin Youde attached too much importance to his own son's Air Force. On the other hand, some people believe that the air force has robbed the navy of its glory -- the reason is naturally the air force's attack on the British navy's Grand Fleet, and these people stubbornly believe that the use of the air force is dishonorable, and the battleships should be duel with the battleships in a dignified duel, and then use solid gunnery and steering skills to kill the other side.

Because of this, the Navy and the Air Force have been at odds for a long time, and now that the Air Force is suddenly in command of the Navy's submarine forces, which have just completed their reorganization, it is completely conceivable how fierce the Navy's reaction will be.

Lin Youde felt a little powerless.

"Try it anyway, in the vast Atlantic, it's obviously not enough to rely on a cordon of submarines, we need radar."

In another time and space, the wolf pack tactics are mainly aimed at the Arctic Ocean routes of the allies, and the navigation range of the routes is relatively fixed, so the wolf pack tactics can be carried out by submarines distributed in rows to guard posts, and other submarines are called to besiege after discovering the ship group.

After all, the area that a single submarine can search is limited, and with the progress of sonar technology in later generations, the monitoring distance of submarines has also been greatly improved, and with submarine-launched anti-ship missiles, submarines have truly become a force that can effectively threaten the naval fleet. But now Lin Youde's sonar technology has not reached that kind of Cheng Dù at all, and he has not even touched the door of submarine-launched missiles or anything.

After Lin Youde took control of Germany, he set up a sonar equipment studio and went all out to study sonar, but then he found that high-precision sonar is actually quite dependent on electronic components, whether it is to remove background noise or assist sonar personnel to identify sound, it requires quite advanced computers.

Until a breakthrough is made in the related process, there will be a ceiling to the boost of sonar anyway.

In short, although Lin Youde now ordered the German Navy to conduct unrestricted submarine warfare, he was not sure how much success he could achieve.

Lin Youde also thought about increasing the time of submarine underwater activities to improve the combat capability of submarines. The battery of the submarine in this era is generally only a few hours under water is the limit, if the combat speed has been always, the electricity may not be enough for one hour, and it needs to float to the surface to start the diesel engine to charge.

If the two technologies of fuel cell power supply and chemical air purification can be put into practical use now, the combat capability of the German submarine force will certainly be qualitatively improved. At that time, German submarines could have stayed in the sea near the British island, waiting for the fleet to come to the door by itself.

It is a pity that it has been five or six years since Lin Youde established the relevant practical room, and there has been no achievement so far. Lin Youde once again deeply realized how fatal the process bottleneck is, even if he Lin Youde relied on his knowledge to tell the scientists the basic principles of those equipment, and let them run straight towards the goal, there is no way to make things that should not appear in this era become a reality in advance.

If Lin Youde was a science student, he could probably try to improve the process from scratch, but unfortunately, he is not.

Therefore, Lin Youde now only has submarines equipped with "slightly better sonar" and "slightly better batteries", although the performance has been improved, but it has not yet been able to achieve qualitative change.

Lin Youde frowned, stared at the Air Force report and thought for a while, and finally decided: "I think I should write a letter to the commander of the Naval Submarine Command." ”

Now in charge of the submarine force in the German Navy is Dönitz, a submarine warfare expert in another time and space, Dönitz's wolf pack tactics actually pay attention to obtaining intelligence from the Luftwaffe patrol aircraft, so Lin Youde feels that if he contacts Dönitz directly, he can probably promote this cross-service cooperation more smoothly.

Lin Youde quickly finished writing the note and sandwiched it in the file, and then put the file on the top of the pile of documents that "wait until the return to the delivery department for execution".

Then Lin Youde stood up, came to the window and looked at the goose feathers and snow outside, and felt the chill through the window glass and window frames into the room.

"It's cold."

"yes." Ysera replied briefly.

"This weather is simply tailor-made for the Russians."

Since the temperature dropped to minus 20 degrees, the Russian army has become active, as if it had planned to borrow the harsh winter and heavy snow from the beginning, and small groups of Russian troops continued to take advantage of the wind and snow to penetrate the German front and attack the German logistics system - it seems that the Russian army also realized the importance of logistics from the German army.

The blizzard made it difficult for German tanks and cars to move, and the air patrols and close support of the air force were suspended due to heavy snowfall, and the Russians finally got into fire with the Germans on a near-parity - meaning that the Germans still had a firepower advantage, but this advantage was not as great as before.

However, as Lin Youde predicted, although the Russians are more accustomed to fighting in the harsh winter, the heavy snow and cold have also abolished the Russians' own logistics supply system, and now the Russian army on the front line simply does not have enough supplies to maintain offensive operations, and can only slowly hoard the materials needed for the next year's operations while raiding and harassing.

The situation was similar on Lin Youde's side, although the Russians desperately tried to disrupt the German army's supply plan, the German army's preparations were still ready little by little.

As soon as the snowmelt on the Don Plain ends in the following spring, the great war will begin again.

At that time, people will die in batches, and countless riches will come to naught.

Lin Youde was sighing at the heavy snow outside the window, and Ysera spoke again: "It seems that the Institute of Theoretical Physics is planning to conduct another experiment in the last few days of this year, and I have here the application they just submitted to borrow Lydia. ”

"Approved."

"Is this really good?,Treat the god as a real yàn body or something......"

"This is actually no different from the group of people who asked the gods to cooperate with the Institute of Theoretical Physics to collect the fluctuation numbers, and the success of the last real yàn has greatly improved the safety factor of this real yàn, so there is nothing to worry about."

"Okay. However, this time, the Institute of Theoretical Physics also asked to borrow Oh-chan as a 'reference', which ......"

"They probably want to actually verify the hypothesis that collapse affects the operation of time. When the time comes, Lydia wears a timer in the machine, and Oh-chan brings one outside, and when it's over, you can compare it with other timers placed in different environments. ”

"I see," Isera nodded vigorously, "so Oh-chan is up to the job...... Then approve it. ”

Ysera wrote something on the text jiàn, then picked up the seal and solemnly stamped it on the signature column of the text jiàn.

After putting the processed Wen Jiàn on the corresponding Wen Jiàn pile, Isera raised her head, turned her head to look at her father in front of the window, and whispered, "I don't know what the research of scientists will bring us in the end." ”

"It's because I don't know what to expect from this study, so I'm looking forward to the results of this study." Lin Youde turned around and smiled at his daughter.