Of course, in fact, the SEA    The Type IV aircraft is just a compromise between ideal and reality, because we have to use French self-produced engines, which determines that my aircraft can only use second-rate engines. Secondly, because I have to consider the engine damage in the war, I can only choose to use air-cooled engines instead of liquid-cooled engines. But no matter what, it is still enough when it first appeared."

"In terms of power selection, we have a half-class gap from the top level, but in fact, I have never given up on the pursuit of cutting-edge aerospace performance. In the design of the SEA V-type aircraft, I was going to use the British Eagle liquid-cooled engine, and to adapt to this engine, my team and I optimized the appearance and structure of the entire aircraft. It was originally planned to deal with the more advanced aircraft in your country, but the war was over and it could only stay in the prototype stage forever." Marcel sighed.

"So, now you're going to revive Daimler-Benz engine?" Henkel asked.

"Well, that's right, if I can, I hope this bid will revive my factory," Marcel said.

"That depends on your ability. By the way, this bid is whether it is the Bavarian government or giants such as Junckers and Faulk, which will come up with their own new products," Henkel said.

"In addition, I would like to ask, have your country found that using gasoline from different origins during aviation flights will lead to a relatively large gap in the aircraft's flight performance?" Marcel asked.

"Can you tell me more in detail?" Henkel asked.

"Of course, for example, when our aircraft uses their own fuel, it is easy to cause knocking. You and I know very well that under normal circumstances, the operation of the cylinder should be like this. With the piston pushing, the air and gasoline mixture inside the cylinder begin to compress. When it reaches a certain level, the spark plug begins to ignite. At this time, the gas ignition and expansion work. This process starts from the spark plug and then diffuses to the surroundings. But sometimes, before the piston moves to the ignition point, the oil and gas mixture inside the engine will be ignited in advance! However, it causes the cylinder to vibrate. At the mildest, it affects the engine output power, and at the worst, it directly leads to the engine scrapping." Marcel said.

"We have encountered this problem, and it should be a problem with oil," Henkel said. "Our engines rarely occur with low compression ratios, but they are more common in some high compression ratio models, so we have to add something to this."

"Yes, when the compression ratio is low, is this problem not obvious, but when the high compression ratio is used, this problem is more serious. At present, the only way the French Air Force can do is to use a mixture of water and methanol that can spray into the cylinder when high power is needed. However, this problem is just an idea and has not been completely solved." Marcel said.

In fact, the so-called engine knock problem was discovered very early in history, and for this reason, engineers also used high-speed cameras to observe the process and reasons for the knock. Then the people measured the anti-detonation performance of gasoline and specifically proposed the so-called octane concept. What does this concept mean? That is to say, a mixture of n-heptane and isooctane is used to describe the anti-detonation value of gasoline. As for why these two substances were chosen instead of others, the reason is very simple. The volatility of these two substances is similar. No matter how mixed, the proportion will not change.

So, what does the so-called No. 87 fuel mean in history? It means that the anti-detonation ability of this gasoline is the same as the mixture of 87% isooctane and 13% n-heptane (isooctane has better anti-detonation performance than n-heptane). So the larger the isooctane ratio, the better the anti-detonation effect. It also means that the better the fuel performance it represents.

So now the question is, how did the so-called No. 130 fuel in the war come out? After all, it is only 100 when it is completely octane! The reason is very simple, adding anti-detonator to increase it! In fact, the so-called No. 130 fuel no longer means the so-called isooctane ratio. In history, the best additive that appeared before World War II was the tetraethyl lead series.

Well, someone may ask why water and ethanol will not knock? The reason is very simple. First, adding a mixture of water and ethanol will cause a decrease in temperature. One of the reasons for knocking is that it starts to burn early due to temperature and pressure. On the other hand, ethanol has better anti-detonation performance, while water vapor will not knock... So after adding ethanol and water, the anti-detonation performance of the mixture in the cylinder will naturally be greatly improved!

However, for this plane, both Germans and Americans have not evolved to the point where they began to use various additives to improve fuel performance. Even the simplest and most crude emergency method of injecting water and ethanol mixtures in later generations was only thought out and not practiced. So what are the solutions for the participating countries? The Germans' solution is very simple, because they found that Romani's fuel quality is relatively high, so they directly restricted the crude oil produced in Romania from aircraft engines and tried to improve the refining level. As for the Allies? The solution is also very simple, limiting the power.... When it comes to a certain temperature and pressure, it will cause a knock, so isn't it enough to reduce the power?

"Using a mixture of water and ethanol to improve temporary knock performance is only an emergency solution. In fact, we should still improve knock resistance from the perspective of fuel, so we are currently trying to synthesize some additives to improve this performance. It just takes time and a huge investment," Henkel said.

Finally, after the discussion, Henkel's evaluation of Marcel was very high. After all, the latter does have very profound attainments in aviation theory, and some methods are also very good. This is the most valuable!

There are also unique features in technical details. For example, the shock absorbers specially installed on two large-caliber machine guns placed inside the wings that were visited later were used to reduce the impact of the machine gun's vibration on flight during shooting.

"Marcel Brochel is a very good aircraft designer. He definitely represents the highest level of the French aviation industry. If such a master can join the Bavarian aviation industry, it will undoubtedly play a very important role in our career." Henkel wrote in his letter to the crown prince.

The second update is presented~~~! Please subscribe and reward~~~!!!

Reading URL: m.
Chapter completed!