Chapter 2776: So many requests

For Qin Guan, since he has to do it, he must do his best. Anyway, even if he does not ask for it, Ruby Design Bureau will make improvements.
Although they are all called Kilo-class submarines, there is a big gap in performance. In the early days, they were called the 877 type, and later, they were called the 636 type. The appearance did not seem to change much, but its displacement was slightly enlarged. , But the combat capability has been worlds apart.
Now, since Han Guo wants to order, it is better to purchase the most advanced submarine. Moreover, if it is to be improved, it is Han Guo's submarine designer to design with them. After all, many of the equipment in it will inevitably be replaced. Han's own equipment, in this way, can further improve the combat effectiveness of the submarine.
The first modification is the propeller.
For submarines, the noise emitted by the propeller is the biggest. In the past, the submarine used a three-blade propeller with high speed and loud noise. Later, the blades of the propeller began to increase, five blades, seven blades, and the number of blades increased. At the same time, the diameter of the blades begins to expand. In this way, a sufficiently high thrust can be obtained while the speed is reduced. The lower the speed, the lower the noise.
"It is necessary to use a seven-blade or even a nine-blade large skew propeller with a better design, and the speed is reduced to 250 rpm, so that it can have better low noise performance." Qin Guan said.
Speysky frowned for a while, do you think it's that simple to say something? To build a new propeller requires complicated programming and complicated calculations. Do you think it’s as simple as moving your mouth?
"If you can't do it, you can leave the propeller at the tail, we process it in China, and then install it." Qin Guan continued.
For a submarine, the propeller is one of the most confidential components. It can be seen that even when it is transported in a dock, the propeller will be wrapped tightly. It is afraid that the outside world will know the shape of the propeller, so as to infer the propeller. The sound characteristics too.
Since this submarine was ordered by Han, then Han must join in. Anyway, Han is definitely the most advanced in this regard. There are countless solutions to achieve better performance, as long as the parameters of the drive shaft come. Once the matching is complete, the propeller can be installed on its own.
"In terms of batteries, your battery has a lifespan of only two years. This is absolutely impossible. There are better battery supporting companies in our country. The batteries produced can have a life of at least five years. If you don’t have the same Battery, then we need to use our own battery." Qin Guan continued.
When the submarine is sailing underwater, the battery is the main power. This is no different from the old scooters and electric bicycles. It is the most common lead-acid battery. The performance of the first two years is good, and then it begins to shrink significantly. It takes 100 kilometers to be charged with electricity, and in the end it can’t even run 50 kilometers. For electric vehicles, it’s a big deal to charge a few more times. For submarines, it’s hard work. Increasing the number of floating charges is dangerous. So, as long as the endurance is reduced to a certain value, you have to replace the battery.
The products produced by Xiong Country have a lifespan of only about two years. After that, they have to be replaced with new ones. The ones produced by themselves can be used for at least five years. Therefore, if the other party does not have similar products, they have to use their own. In order to achieve excellent performance, Qin Guan is absolutely striving for perfection. Even with the AIP system, the battery cannot be relaxed.
In the submarine, the oldest lead-acid battery has been used, and the energy density can be increased by a large amount of lithium batteries, which have never been used. This is because lithium batteries are too dangerous, so small batteries are connected in series and parallel. If it is made into a car, it is already very dangerous, not to mention that the battery used on the submarine is equivalent to dozens of cars, and the complexity is greater, and the performance of this thing is not good at low temperatures. After the submarine is submerged, the temperature will not be too high.
Spasky's brows are getting more and more frowning. He originally wanted to fool the Chinese people. Who would have thought that they knew the parameters of their submarine so clearly that they even knew the battery life! They are not as easy to fool as Baixiang people!
"We also have batteries with a five-year lifespan, and they can be used by you," Spasky said.
"That's the best, but when we have to sign the agreement, we should make it clear that if the battery life of the submarine is less than five years, then you are responsible for replacing it free of charge. We will keep the last payment after five years. Give it up again," Qin Guan said.
Qin Guan's words shocked Spasky even more. Their conditions were really harsh. In the past, when Xiong Country sold military equipment to foreigners, where it was their turn to choose and deduct the balance. !
This is market-oriented. It’s not in your previous era. Qin Guan thought secretly in his heart. In fact, in any project, it is normal to leave a part of the balance payment. You promise a five-year lifespan. What should I do if the year is not reached?
Do you rely on your credibility? With this reputation, it really depends on luck. It is like some electric vehicle companies that promise a lifetime warranty on the battery, but the battery is not a battery. What if the battery's control circuit is broken? Moreover, even if the battery core is broken, someone will test it and say that the damage is caused by improper charging while charging. What can you do?
Only if you leave the balance payment, you can have confidence. If you don't fix it for me, then I won't give you the balance payment. It's that simple.
"Its sound insulation system must be more sophisticated to ensure lower underwater noise. We also hope that you can use the latest type of sound-absorbing tiles."
Xiong Guo has made great progress in submarine technology in these years of development. This includes sound-absorbing tiles. They have developed many types of sound-absorbing tiles, which are attached to the surface of the submarine to greatly reduce noise. Of course, in During the long voyage, the silencer tiles sometimes fall off, so some of the submarines in the bear country will look mottled and feel very vicissitudes of life.
"Some of the equipment inside, we hope to know the specific indicators, if it is not advanced enough, we also hope to replace it with our similar equipment, especially the most important sonar system inside." Qin Guan continued.
Spasky was almost about to take the case, we will not do your business! There are only four submarines, why is there so much nonsense? This is simply tailor-made for you. The amount of labor just paid in the design bureau is quite large, not to mention that the factory has to learn new crafts again.