Walking across the steel trestle paved with wooden planks, Xu Jun and his party stepped onto the deck of U1001. Unlike the flat, open upper decks of previous submarines, the deck of this new submarine is slightly narrower. The steel deck, carved with anti-skid lines and drain holes, runs along the central axis of the submarine to the conning tower, then bypasses the sides of the conning tower and ends at about ten meters in front of the bow. The breadth of this narrow deck is only 1.5 meters at its widest point, and the narrowest position is on either side of the conning tower, which is only 50 centimeters wide, just enough for a sailor to pass.

Beyond deck, the hull has a distinct arc that descends from both sides of the deck to the water. The cross-section of the boat is circular, and it is only the first impression that the submarine makes on the people who visit.

In the past, German submarines had a very complex cross-sectional structure, just adding a bunch of required compartments outside the pressure-resistant hull, fuel tanks, ballast tanks, head and tail balance cabins, etc., the overall appearance is still inseparable from the influence of surface ships, in general, it is a warship that can dive, and the water surface is the home of this ship. The overall design of the German submarine paid more attention to the maneuverability and seaworthiness of surface navigation, and the surface speed and endurance were the hard indicators of a submarine at that time.

Although the XXI submarine adopts the concept of transcending the times, but the designer's thinking still has not been able to bypass the original mode of thinking, although this submarine adopts a cross-era double-shell design, the line type also uses a large number of results in hydrodynamics at that time, and many details have been obviously optimized design, but due to the inertia of the thinking mode, in the end the submarine was stunned in the stereotyped design, and the designer installed an unnecessary wave-breaking bow for this submarine. At the same time, the hull construction has been designed accordingly.

Although this submarine has transcended the era in concept, the design of the boat shape exposes the limitations of the designer's vision at the time, making it a legendary superboat. In the end, it can only become a nondescript transitional model, far below the actual value of the kind of idea she represents.

In Xu Jun's view, this sharp, knife-like bow is a complete addition to the snake, but it weakens the submarine's original potential. Since the submarine is generally a double-hull design, this means that any change in the shape of the non-pressurized hull outside the inner pressurized cabin will not affect the internal layout. Xu Jun did not hesitate to cut off the ten-meter-long blade-shaped wave-breaking bow structure in front, the steel part will only affect the underwater maneuver of the submarine, just imagine the difference between a chopstick and a soup spoon when stirring in the water, you can find out how much resistance this slightly forward forward wave-breaking bow will cause to the submarine's underwater steering maneuver.

Xu Jun changed the original bow position to a round and blunt shell, because the internal structure is difficult to further optimize, and the bottom of this submarine cannot be modified into the popular droplet line type in later generations, because of the aspect ratio. Xu Jun could only choose to take a step back, and changed this submarine to a whale-shaped bow that was popular in later generations, and tried to get as close as possible to the advanced conventional submarines of later generations in a linear form.

In order to replace the bow of this boat, Xu Jun has exhausted his efforts, and he does not have similar information in his database, he can come up with the design drawings of the mainstream diesel-electric submarines of the fifties, but the performance of those submarines is not much improved compared to the XXI, and some designs are even inferior to this Nazi-era submarine.

Xu Jun could only rely on his personal memory to draw a basic sketch for the design bureau to improve, and a bunch of fluid dynamicists and mathematicians spent a week. Finally they figured out what they thought was the best optimization. At the same time, the Führer's brain opened the eyes of these scholars, opened a closed window for them, and saw another new path of development. In fact, these problems have been revealed in the design of torpedoes in the past, but no one has ever studied them further. This time, Xu Jun's design completely lifted the veil, and experts began to gear up, hoping to make more significant discoveries in this field.

The new bow proved to be a significant increase in the underwater performance of the submarine, and His Excellency the Führer's design was ahead of its time. No one had ever come up with a similar idea before, a new type of submarine that would focus on underwater combat, and Dönitz read the design drawings. I can't wait to run to the headquarters immediately to bow down to the apostle.

Since Xu Jun has improved the bow of the XXI type, the structure of the stern must of course be changed accordingly. However, Xu Jun found that the stern design of the XXI type had reached the level of the fifties, which can be said to be the pinnacle of current technology, except that the line type was consistent with the whole, and the structural arrangement had deviated from the traditional surface ship mode of German submarines.

If a comprehensive change is carried out like those submarines in later generations, it will inevitably affect the structure of the entire tail section, and in the absence of more powerful engines, twin-engine and twin-shaft propulsion will still be the mainstream of the design of conventional diesel-electric submarines in the world for a long time.

Of course, Xu Jun knows about the single-shaft large-tilt propeller, and also knows the cross-balanced tail rudder. The problem is that these technologies are beyond the scope of his database, and he can only make some experimental improvements based on the technology in his hands combined with his memory. Xu Jun optimized the shape of the stern as much as possible, strengthened the mechanism of the horizontal rudder and the vertical rudder on the original basis, expanded the area of the rudder surface, and added two deflectors similar to aircraft flaps on the horizontal deflector wing of the fixed propeller shaft, which can increase the effectiveness of the horizontal rudder in high-speed navigation, and at the same time, through the opening and closing of the deflector plates on both sides, it can also be used as an emergency rudder to adjust the course and hull balance of the submarine.

Under Xu Jun's modification, this submarine has truly become a transitional version, a transition of an era. According to Xu Jun's estimates, it can probably reach the level between the sixties and the seventies, of course, it is only his personal opinion, in fact, there should still be a big gap with those third-generation mainstream submarines. However, in this day and age, this submarine will be a nightmare for all enemies, and Xu Jun firmly believes that with the performance of this submarine alone, no escort ship can match it, and if it is controlled by a cunning captain, the enemy will not even know who attacked him until the moment it sinks.

Xu Jun corrected the cross-sectional shape of the submarine to make it closer to a circle, although it is a bit impractical to achieve a perfect circle, and the ship should be relatively close to an oval, looking fuller than the original egg, so that the underwater maneuverability has been greatly improved.

"Please go this way. My Führer. "Captain Heinck stood by the control tower and waited, and a steel cable fence was temporarily added here for safety.

Xu Jun's changes to the conning tower are not too big, he likes the original shape of the conning tower of the XXI very much, so he basically retains the original basic design, but slightly revises in some details, the original design of the upper top of the conning tower has been changed to a vertical downward design, in Xu Jun's opinion, the original upper layer is wrapped under the roof of the conning tower, this kind of external floating is not necessary at all.

The two twin-electric 20mm turrets in the front and rear were retained, and although Xu Jun didn't think it could do much, it was better than nothing. It should be no problem to scare low-altitude targets, and it can also have a very good sound and light effect when used to strafe some surface targets, and more importantly, it can slightly increase the sense of security of some crews, so that they will not feel bare-handed, so Xu Jun finally decided to keep these two anti-aircraft turrets that have almost become XXI characteristics, and also consider making newer replacement products in the future to increase the anti-aircraft firepower of this submarine.

The U1001 has only three external hatches above and below the boat, and this submarine is different from previous models in that it lacks a tail torpedo loading hatch than ordinary conventional submarines. Because such submarines do not have tail torpedo firing equipment. Of course, there is no cumbersome tail torpedo compartment.

All the weapons of the submarine are installed in the bow of the submarine, which is generally only the case for small offshore submarines, and the U1001, a giant shark of more than 2,000 tons, is a bit special. In fact, this is also a valuable experience gained by the German Navy in the use of submarines for a long time. Although the tail torpedo increases the means of submarine attack, it also consumes valuable tonnage, and the submarine most of the time meets the enemy head-on, and there are not many opportunities to actually use the tail torpedo. Turning the bow of a ship to attack was cumbersome and dangerous, and many submarine captains avoided the use of tail torpedoes, treating them as a last resort.

The XXI model uses technology that is ahead of its time. The new hydraulically assisted reloading equipment gives her the ability to quickly reload torpedoes in battle, and this improvement, combined with the excellent maneuverability and concealment of the submarine, will allow the XXI to always have the initiative on the battlefield, rather than being chased by enemy ships after shooting out of torpedoes, as is often the case. Therefore, the elimination of the tail torpedo tube will not reduce her combat capability, and the tonnage and space saved can be used to install more advanced equipment.

In addition to the torpedo loading port in the bow, the Type XXI submarine has only two personnel access hatches, one of which is at the top of the conning tower platform, which is directly connected to the captain's conning tower and the general command cabin. The other hatch is inside the tower enclosure, and access to the tower is provided through a side door in the tower enclosure, which then allows access to the submarine through an access hatch on the deck.

In order to use the hatch in front, Xu Jun had to step on the pedals on the outer shell of the control tower, climb the more than four-meter-high control tower, and climb over the fence to reach the lookout deck where the hatch was located, although Xu Jun didn't mind doing this, no one else present would allow him to take such a risk.

So a group of people could only enter the submarine through the second hatch. Not only Germany, but submarines of all countries will leave a hatch in this position. Xu Jun insisted that he be the first to enter the submarine, and everyone had to obediently obey on this issue. The Führer tucked his cane under his arm and climbed slowly down the straight iron ladder.

When the shiny riding boots stepped on the floor covered with a layer of rubber non-slip mats, Xu Jun turned his head to look around, and when he raised his eyes, he saw a chef holding a soup spoon, standing in front of the electric stove in a daze.

"Hi Reinhardt!" The chef stood up in a trembling salute, and the spoon in his hand slammed into the smoked pig's trotters hanging from the bottom of the closet, where the two-kilogram piece of pickled product swayed.

"Hi...... Forget it, you keep working. Xu Jun raised his scepter and knocked the brim of his hat, then turned his head to look at the top of the ladder.

Monthly pass, monthly pass, continue to ask for a monthly pass, please continue to vote for the remaining monthly pass in hand, thank you for your support for this book, I will continue to work hard to update. (To be continued......)