"Does Mr. President have a plan?" Castingoni knew that Eric was also an expert in this area, and that many products such as the Eric Group were designed by him.

"This idea is just now, to be honest, I don't have a complete plan now, I can only put forward such a request to you, the key to this kind of aircraft is to be large, to have endurance and super stability." Eric was a little embarrassed, because it was really difficult to make such a request.

Castingoni doesn't know how old Eric is, with a tank? Loading a number three? Or ten cars? The difference between the two is very different.

"I wonder what kind of tanks Mr. President is going to load? How much do you want to load at once? "Castingoni is worthy of being born as a designer, and he got to the point right away.

"One of the tanks being developed by the Ministry of Defense is the No. 4 tank designed by Mercedes-Benz, and there is already a prototype car, which is almost finalized in terms of size, which can be used as a reference, but for the sake of insurance, you can leave some redundancy in the loading space." Eric certainly won't just build a large transport aircraft for the new Tank IV, and will have to take on more transport tasks in the future.

The development plan for the No. 4 tank is highly secretive, BMW has no contact with it, from the engine to the appearance of the whole vehicle, plus all the weapons and equipment on board are not involved in BMW, so Castingoni has no way of knowing any data about this type of tank. Brauchitsch pulled out his notebook and showed the data for Number Four to Castingoni.

While Castingoni was still recording the data, Eric had already drawn a sketch of the wings and the enlarged fuselage in the top view.

Eric pointed to the wing with the tip of his pen and said, "I guess you also asked a lot about the data of the 'Hansa 1' and knew about the whole wing spar." ”

Castingoni nodded noncommittally, how could this matter be hidden from the national intelligence agencies?

"If you're willing to take on this task, I can get the Eric Group to consider selling the technology. Let TÜV Rheinland help you build this 70-meter-long wing spar. Eric looked at Castingoni's expression. The requirements of the whole smelting technology are very high, and it takes a long time to imitate and copy it.

BMW and Mercedes-Benz do not have such technology, even Fokker does not have such ability, and at present, in Germany, only Junkers and Krupp have the right to use this "invisible patent". In fact, after Krupp obtained the relevant technology, it was trial-produced many times in the Ruhr industrial area, and the probability of success was not high, let alone BMW. If you want to steal this patent, even if you get a sample, you can't use it, only by directly getting the original data and technology to use it, the rise of BMW is the key.

"I am grateful to Mr. President for your trust, and I guarantee that BMW will sell such a transport aircraft to the military at the lowest price." Castingoni is very good, and with such technology, there is also competitiveness. Then he added: "We will pay the patent fee at 30% of the international price." ”

Eric nodded, admiring Castingoni's energy, knowing the current affairs and advancing and retreating.

Next, they returned to this sketch, and from the front view of Eric, Castingoni found an interesting point, which was the large chin in the nose.

"You read that right, this place is the door, the only entrance and exit of the whole machine." Eric explained.

Castingoni was convinced of Eric's identity as a designer at this time, and the strength of the current airframe is generally insufficient, in order to save weight as much as possible, aviation aluminum will be used, and then Germany launched Super Dura aluminum, which solves a large problem of airframe strength.

However, even the Super Dura aluminum is difficult to bear the tension of the 70-meter wing length when flying in the air, and it is easy to be squeezed and deformed if it is not done well. People generally only think about the open space on the sides of the fuselage and the tail, but in fact, such air compression forces are greater, and often the strength of these joints is also the weakest. As soon as any structural problems arise in these places, it can trigger a serious air crash. Eric placed the door on the nose of the machine, which really cleverly solved the problem.

With such a sketch, Castingoni had a score in his heart, and his confidence suddenly increased. However, not all the problems have been solved, and the real challenges are yet to come.

"Mr. President may not know that your 'Lufthansa 1' occupies a large amount of aluminum in the country, and if you want to build a new large transport aircraft, I am afraid that there will be a shortage of aluminum in China." Castingoni is right when he says that although Germany's annual production of aluminium is already impressive, it still needs to rely on more imports to sustain domestic demand.

The tanks, radios, transport ships, passenger planes, and so on sold by Germany are all produced and assembled in Germany, accounting for a large part of the supply of raw materials. Then there are the Air Force's F-200C, BF-1, BF-10 and other aircraft, the consumption of aluminum is even more amazing, and 1.4 million tons of electrolytic aluminum cannot meet domestic demand.

If the annual consumption of 2 million tons of aluminum is not terrible, then the domestic consumption of infrastructure, shipbuilding, military industry, domestic industrial zones and so on has not stopped 74 million tons of steel output, even the United States is dumbfounded. Therefore, it is necessary to continuously import large quantities of aluminium ore and aluminium blocks from the United States and Hungary to support domestic production capacity.

Eric did not hesitate to spend a lot of manpower to build the country's railways and highways, occupying almost half of the financial funds, and the annual power generation in 1920 alone was more than 130 billion kilowatt hours, half higher than that of the United States, and the total power generation of the world except the United States.

In 1920, steel production was more than 70 million tons, and nearly 10 million tons needed to be imported to make up for the shortfall. This is not to say that Germany's domestic demand must need so many raw materials, but because Germany has too many stealth plans under Eric's layout, such as large-tonnage ships, large floating docks, and so on.

In the same year, Germany's annual coal production increased to 1.8 billion tonnes due to the need for power generation. But few people know that not all of the 1.8 billion tonnes of coal is used to generate electricity, and almost half is used to support the Coal Power Initiative.

The coal energy program also carried out the integration of several projects after synthetic oil, including "synthetic oil" and "coal decomposition".

The main use of synthetic oil is to supply aviation use, after all, the production and cost performance are not as cheap as imported crude oil refining, and the coal decomposition project is to alleviate domestic domestic gas consumption. In order to make up for the shortfall, coal was used for decomposition, but the production capacity was not high, and the technology needed to be improved, and in the end, the gap in this area was still very large, and it had to be imported from the Soviet Union and the United States.

"I will find a way to solve the problem of raw materials, and your task is to solve the design of the aircraft." Eric is not worried about the engine. There is no shortage of non-ferrous metals in Germany now, and mining in China has been uninterrupted, and there are some improvements every month.

After sending off Castingoni, Eric called Hans Luther again, and the national resource coordination work, Eric was ready to hand it all over to Hans Luther, which was a necessary experience for Hans Luther before he could run for the country's prime minister.