Why did Hitler rush to invite Cheng Gong to visit Germany, Cheng Gong was like a mirror in his heart.

Three "King-class" battleships promised to the German Navy have only now been delivered, and the other two will not be available until the spring of 1942. Of the four all-round fast combat support ships, only one was given to the German Navy, and the remaining three were "snatched" by Hirohito.

In addition, the four Yamato-class heavy aircraft carriers have also joined the Japanese Navy's Combined Fleet for official service. The German Navy had a little more XXI submarines than the Japanese, and the basic destroyers were divided equally between the two at that time, but the Torokawa-class torpedo boats were all taken away by the Japanese Navy.

It can be said that in terms of naval equipment, Japan received significantly more benefits than Germany, and Hitler was certainly unwilling.

In fact, both Hitler and Hirohito understood that there is no such thing as a free lunch. The more they want from Cheng Gong now, the more they will need to repay in the future.

In Cheng Gong's words, he is now investing in futures, but this futures is war!

Hitler had already concluded that Cheng Gong must still have good treasures in his hands, and these good treasures would gradually show their sharp fangs to the world as they joined the Royal Air Force of Donghua, the Royal Navy and the Royal Army.

Therefore, Hitler is now anxious to end the relationship with Cheng Gong as a "netizen" and have a cordial meeting between the top leaders of Germany and East China.

In fact, not to mention Hitler's eagerness to know, now the world's top military and political leaders are now waiting with their eyes to see what kind of novelties will be the weapons and equipment of the Royal Navy, the Royal Air Force, and the Royal Army after being reequipped.

As Germany and Japan transported more and more weapons and equipment from the Donghua Empire, gradually, the national armed forces of the Donghua Empire were only five air cavalry divisions of the Donghua Royal Army.

All the equipment of the Royal Air Force and the Royal Navy of Donghua was "divided" by Germany and Japan.

According to the information sent back by the military observation group stationed in the Donghua Empire, the Royal Air Force of Donghua did not even have a single aircraft, and the Royal Navy did not even have a single ship left. Emperor Jincheng of the Donghua Empire seemed to be telling the world that Donghua did not need to retain a strong navy and air force, and that it was enough to keep an army that could barely protect itself.

However, with the Australian kangaroo as a living example, no country now believes that the Donghua Empire's disposal of active equipment is self-defeating.

Maybe the young emperor is holding back something bad, trying to lure an unsightly country to be fooled like an Australian kangaroo, and then justifiably turn that country into a vassal state of the Donghua Empire.

I think that at the beginning, if it were not for Cheng Gong to resell all the capital ships belonging to the PLAN Pacific Fleet to Japan, Britain and France would definitely not have instigated the Australian kangaroo to touch this mold.

Now Cheng Gong has put on a high posture of putting swords and guns into storage, putting Nanshan on the horse, not expanding, not hegemonizing, and maintaining world peace and stability.

Therefore, whether it is the Axis camp or the Allied camp, everyone is eager to obtain accurate information on the existing military forces of the Donghua Empire, so as to provide reference for their respective countries' strategic decisions.

In fact, Gao Zhihang, commander-in-chief of the Royal Donghua Air Force, had already taken Liu Cuigang, Le Yiqin, Liang Tiancheng and others to receive the first batch of new planes at a secret air base in the central mountain range. The commander of the Royal Navy, Chen Jiliang, also led a group of his men to see a huge submarine surfacing at the Bjark naval base.

As the founding fathers of the Donghua Empire, Gao Zhihang, Liu Cuigang, Chen Jiliang, Chen Shaokuan, Sun Liren, Hu Lian, Dai Yunong, and Shen Zui, the eight King Kongs, still have a little understanding of His Majesty the Emperor's weapons and equipment replacement plan that he has long mentioned. Otherwise, they would never allow His Majesty the Emperor to sell all the "lives and roots" in their hands to Germany and Japan as if they were garbage.

These elite generals from the Nationalist Government still have a somewhat good impression of the Germans, but they really hate the little devils so much that their teeth itch.

Seeing that His Majesty the Emperor sold so many advanced planes, tanks, and warships to the Japanese, even if they knew that His Majesty the Emperor was playing tricks on the little devils, they were still unwilling and reluctant in their hearts.

The F-4G "Ghost" improved fighter and Seawolf-class attack nuclear submarine are two new types of equipment that Gao Zhihang, Chen Jiliang and others know about that will soon join the service of the Royal Air Force and the Royal Navy of the Donghua Empire. As for when the rest of the equipment of the Royal Air Force and the Royal Navy will appear, they are also now looking forward to it.

……

The Weilan Mountains, the central mountain system of the Donghua Empire, the Weilan Air Base of the 1st Air Force of the Donghua Royal Air Force, are heavily guarded, and the entire garrison station still maintains the first-level combat readiness that should be in wartime.

Inside the control tower, Cheng Gong, dressed in ordinary Marine Corps camouflage training uniform, was chatting and laughing cordially with Air Force Admiral Gao Zhihang, commander-in-chief of the Royal Air Force, Air Force Lieutenant General Liu Cuigang, and Air Force Lieutenant General Le Yiqin.

The concept of the Great Air Force has always been the law of inhumanity that Cheng Gong believes in.

Therefore, at the memorable historic moment when the 1st Air Force of the Donghua Royal Air Force collectively replaced advanced fighters, Cheng Gong personally rushed over to attend and witnessed the first "Air Force Day" belonging to the Donghua Royal Air Force with Gao Zhihang and others.

"Ziheng, as the commander of the world's first air force equipped with jet aircraft, I have to test you today."

Cheng Gong looked at the rows of base guard regiment soldiers standing still like javelins on both sides of the airport runway, and the silver-gray F-4G "ghost" improved fighters, and smiled easily: "What is the core and most critical thing of an advanced jet aircraft?" ”

"Engine!" Gao Zhihang replied categorically without hesitation: "Aero engine is the core heart of all aircraft!" And the core of the engine is the material! As early as the 17th century, Dutch physicist Huygens and Romanian Henri Koanda both tried to use steam power and internal combustion engines to achieve usable jet engines, but they failed because the materials were not up to standard.

Later, physicists began to experiment with hybrid jet engines. Using a conventional piston engine to drive the fan to compress the air and occupy the space behind the gas propulsion, this kind of thermal injection engine is simple in structure, but it is very heavy and lacks thrust, so it is very practical.

There is indeed no shortage of genius scientists in Europe, some people think of the principle of gas turbines invented by the Norwegians in 1903, and believe that the key to solving the problem of thermal jet engines is to use a turbine driven by gas to drive the compressor, so that the excess piston engine in the hot jet engine can be omitted and more thrust can be provided. However, there are still insufficient materials to make such an engine, and there are many problems in terms of safety and continuous operation.

In 1915, an Austro-Hungarian scientist devised a device to increase the range of artillery shells by means of gas and compressed air, which compressed and ignited the air flow of the shells at high speed through a variable cross-section air intake, thereby providing thrust. Although the Austro-Hungarian army did not eventually adopt this design, the scientist registered a patent for a supersonic ramjet engine in Germany in 1932, which was approved in 1932.

In 1921, the Frenchman Maxim patented the first jet engine, and his design resembled an axial jet engine. In 1923, a report published by the National Bureau of Standards doubted the role of jet engines. The report concluded that jet engines had little economic value for low-altitude flight at the time, and even pointed out that any possible jet propulsion had little practical value, let alone military use.

However, the doubts of the Americans did not hinder European scientists from studying jet engines. In 1928, Frank Whittle of the Royal Air Force College Cromwell in England patented a new jet engine design, which was granted in 1932.

Whittle's design was to mount a two-stage axial compressor in front of a large centrifugal compressor and be turbine-driven. But then Whittle removed the front axial compressor in favor of a larger centrifugal compressor. In 1937 this engine was experimented, but it was unsuccessful due to a fuel leak failure. Because the British government was not interested in it, Whittle's design was shelved.

At the same time, Hans von Ojan of Germany was also working on a completely independent design in Germany. His original design was to be powered by electricity, just to demonstrate the feasibility of such an engine. Later, he joined the Heinkel company, which was looking for a jet engine design, and prototyped a new engine.

The new jet engine designed by Aoan initially used hydrogen as fuel, and later switched to regular aviation fuel, which can provide a maximum thrust of 5,000 N. On August 27 this year, German pilots took off in the He-178 equipped with an Aauan jet engine, which can be regarded as the first jet plane in human history to take to the sky. Of course, this He-178 from Germany simply cannot be compared with our F-4G. ”

"Not bad, not bad!" Cheng Gong looked at Gao Zhihang with approving eyes and nodded repeatedly, "Ziheng, in the topic of pondering jet engines, it seems that you have really put your heart and soul into doing your homework." This is good! I am very satisfied!

As the Commander-in-Chief of the Royal Air Force, you should not only know how to fly jet fighters in battle, but also understand and master the design principles and basic structure of each jet. This is the knowledge structure and literacy that an excellent commander must have! You don't necessarily need to be fine, but you must understand! ”

(To be continued.) )