Thermal expansion and contraction is a basic physical property that is very common in nature.

In ordinary times, thermal expansion and cold contraction will not affect too much, but when the Blackbird reconnaissance plane flies at a high altitude at a speed of Mach three, the temperature of the friction surface between the body and the air will reach more than 300 degrees at this time, and the thermal expansion and cold contraction at this time will be much more serious, and the fuselage will probably be stretched by more than ten centimeters!

Therefore, in this case, the Blackbird's fuel tank cannot use a sealed rubber ring like an ordinary fuel tank, so it is deliberately designed as an elastic box, and the fuel tank will automatically seal when flying at supersonic speed, which is also considered ingenuity.

Leaving room for expansion, you are not afraid of squeezing and deforming, but it brings a new problem, that is, the problem of oil leakage occurs when cooling.

After all, the Blackbird does not fly at three times the speed of sound at all times, for example, in the hangar, the oil leakage is very serious, and there is often a puddle of oil under the fuselage, flowing everywhere.

This secret is known only to those who come into contact with it, and now, Nathan is just a naval aviation, how can he even know this kind of insider?

Everyone put away their disdain and thought about Nathan's brilliant "battles" again and again. "They don't feel like they need to make a fuss about themselves.

At this moment, Graham also came over with a plate, and said to Nathan casually: "I really don't know how the Soviets solved this problem!" ”

American planes should expand and contract, and Soviet planes will not need them? What means did the USSR use to solve it?

The solution of the Soviets, of course, has the way of the Soviets, in fact, Nathan, who came from later generations, has long known that the integration ability of the Soviets is definitely the most powerful.

For example, the S-300 system, after the domestic military experts dismantled it, they were not advanced in one of the aspects, but Lao Maozi simply integrated these non-advanced things into advanced air defense missiles.

And now too, how to fly to three times the speed of sound? How to deal with heat barriers? The idea of the Americans is to use tall titanium alloys, while the Soviet way is to use stainless steel!

The coefficient of thermal expansion of stainless steel is small, so what seems complicated in the eyes of the Americans is almost no problem in the hands of the Soviets.

However, Nathan can't say too much now, just said that this oil leak is to give these self-conscious guys some color and make them shut up, but you can't say too much, otherwise, Emily next to him must be suspicious, she is from the CIA.

Nathan thought so in his heart, and said: "As for how the Soviets solved it, there should be a large number of military experts who dismantled the plane, right?" They should have known a long time ago. ”

This plane definitely couldn't fly over on its own, and it was too slow to load and transport, so naturally it was disassembled and transported directly by transport plane.

At the time of dismantling, a large number of military experts must have found the problem, and now, the plane has been transported here, and it must have been dismantled one by one, and then restored, right?

"Military experts, they are studying it, and it seems that they have not begun to disassemble it yet." Graham said.

Haven't dismantled it yet? So what are they doing? Nathan immediately felt very strange, it is said that the Americans are quite interested in the Soviet MiG-25 fighter, and they are eager to dismantle it immediately.

Moreover, when I came today, didn't I say that I would only have the opportunity to fly at night?

"It's classified, Major Nathan, I'll take you there when I'm done eating, I don't have a mission today." Graham said.

Since he went to pick up Nathan during the day, Graham's energy was no longer at his best, so he didn't fly tonight.

"Okay." Nathan has always disliked breaking the casserole and asking the end, and besides, he knows the answer to the mystery, so what's the point of asking?

The three of them quickly finished their dinner, and then, led by Graham, to a hangar.

The door of the hangar is sealed, and when you come to the hangar, you can see a group of experts, studying the aircraft.

Well, among them are old acquaintances.

Michael Pelehach, the senior designer of the Tomcat fighter, watched a wonderful performance in Mirama last time, and his Tomcat had a soul in Nathan's hands, which inspired him, and now, when he saw Nathan again, he immediately stretched out his hand.

"Nathan, why are you here?" Michael Pelehach is strange.

"I'll fly it." "This plane, which can fly to three times the speed of sound, is a very desirable thing for a pilot to pilot," Nathan said. ”

Hearing Nathan's words, Michael Pelehach shook his head again and again: "Yes, every one of our big aircraft companies has sent test pilots to fly this plane, but now, we don't even dare to start it with electricity, let alone disassemble it." ”

This efficiency is too low, right? Nathan couldn't help but ask, "What's going on?" ”

"Here." Michael Pelehach took Nathan and pushed through the crowd until they finally reached the cockpit ladder, which had a platform next to it that allowed the two of them to see clearly.

"This pin is gone." Michael Pelehach said: "Next to the pin, there is also a Russian word that means danger. ”

There is a pin called dangerous here, but now this pin is gone, and everyone has not found it everywhere, probably because it was lost during transportation, or it is more likely that Belenko pulled out this pin when he got off the plane, and then I don't know where it was thrown.

What does this pin mean?

A group of experts are working on it.

The MiG-25 is the most advanced fighter of the Soviets, how to prevent this fighter from being acquired by the enemy is also an aspect, so, will there be a trap in this?

Among these experts, there are experts in the development of the U-2, and they know quite well in their hearts that the U-2 aircraft has a self-detonation device, and that button is almost the same as this one that has been unplugged.

The pilot was required to press the button before he could eject and parachute, but in fact, the moment the button was pressed, the plane was blown up and the person disappeared, so as to keep the secret to the greatest extent.

So, will the Soviets do the same?

They don't dare to electrify, they don't dare to dismantle, they don't know where to dismantle, they will blow up.

It had been several days since the plane arrived here, but they were hesitant in front of this pin, and besides, according to the information from the intelligence officers, when they asked Belenko about the pin, Belenko's answer was quite vague.

They didn't dare to do it!