Chapter 248: Speed can really do whatever you want

　　 Wang Bu'an felt that Liu Zhenhua was wrong.
　　 It should be said that this is the first time 125 went up high. For the first time, the fire was fully fired.
　　Because before that, 125 had already gone to heaven.
　　 There must be a test flight before leaving the factory.
　　 Otherwise, how did it get from the factory to the experimental base?
　　Before arriving at the experimental base, 125 must have been repeatedly tested, and it was possible to arrive here if it was confirmed that there was no fatal problem.
　　 However, the test flight before leaving the factory is done by the factory itself. The basic goal is to "fly."
　　 When it comes to the experimental base, it is an all-round investigation. It is the requirement to "fly well".
　　 The difference between "fly up" and "fly well" is too far.
　　Any engine can make an airplane "fly".
　　 However, it is not easy to "fly well", be reliable, stable, and can be used repeatedly for a long time.
　　 China’s aviation industry has always been stuck in this one.
　　Why do all aviation people have deep feelings for the J-8?
　　Why are the better-performing Su-27s retired, and some Baye are active in the air and sea?
　　 because it is the first child of China Aviation Industry.
　　 On it, the people of China Airlines have devoted too much effort.
　　 It was also from the stumbling and manufacturing of the J-8, that China’s aviation industry gradually began to take off.
　　 Without Jian Ba, there would be no 20th-class stars today.
　　 Now, Ba Ye will make his last contribution.
　　 As expected, Han Xuewei brought back a lot of information shortly afterwards.
　　 is the flight test data before leaving the factory.
　　 There is a lot of data. Very detailed.
　　 The time, speed, altitude and status of each test flight are recorded in detail.
　　 The layman will most likely have a headache when seeing the dense data. But an expert, as long as he looks at a few key data, he basically understands what is going on.
　　 Before leaving the factory, the 125 flew for a total of 25 hours. The maximum flight speed is Mach 08. The maximum flight altitude is 2500 meters.
　　 Obviously, these are very conservative data. It just happens to prove that 125 can fly.
　　 Why are the data so conservative? Conditions!
　　 First, the test pilots in the factory have limited experience and limited skills. In case of danger, it is difficult to deal with.
　　 Second, if the speed is too fast, it will exceed the airspace.
　　 Third, the flight height needs to be coordinated. Air control must be implemented.
　　Only in the experimental base, there is a relatively large airspace, you can fly freely. There are no restrictions on speed and altitude. The test pilots are also experienced.
　　 There are many civil airports in our country, and commercial airlines are very dense. Especially in the east.
　　 It is almost impossible to clear a safe airspace.
　　 Unless air control is enforced.
　　 But that way, there will be a lot of stranded flights. Passengers who are delayed are strongly dissatisfied.
　　 "Wang Buyan, come here." Liu Zhenhua waved.
　　 "It's coming." Wang Buyan hurried over.
　　 "A few of us meet first."
"Ok."
　　 A group of people enter the meeting room.
　　 There are only five people.
　　 Liu Zhenhua.
　　 Wang Stepan.
　　 Yuan Zhen.
　　 Li Tonghe. Deputy squadron captain of the test flight squadron.
　　 Zheng Jincheng. Deputy Director of the Experimental Base.
　　The main topic of discussion was the first test flight.
　　How to test the thrust of 125.
　　 includes two small contents: flight speed. Flying height.
　　 Obviously, it was directly aimed at double triples.
　　 For any aircraft not just fighter jets, double three is a very attractive indicator.
　　 Flying at Mach 3.
　　 Flying altitude is 30,000 meters.
　　 Even today, when the space is densely packed with reconnaissance satellites, these two indicators are very meaningful.
　　 Especially for flying speed, Mach 3 is definitely sturdy.
　　The world of martial arts is invincible. Only fast is not broken.
　　What does the missile rely on?
　　 is speed!
　　 Ordinary missiles fly at about 35 Mach.
　　 There are very few missiles over Mach 5.
　　 In theory, as long as the flight speed exceeds Mach 5, it can avoid the pursuit of most missiles.
　　The problem is that so far, there has not been a fighter with more than Mach 5. Testing machines, concept machines and the like are not counted. Some concept machines can even reach a speed of Mach 6. But it has no practical significance. Their cost, as well as reliability and stability, are destined to be impossible to install.
　　 In modern air combat, speed is also a magic weapon to win.
　　 The faster the speed, the more likely you are to take the initiative.
　　 Air combat also has commanding heights.
　　 As long as you seize the commanding heights, you can increase the probability of victory.
　　 In case of unfortunate defeat, the chance of escape can also increase. The old MiG-25 relied on speed to get rid of the enemy.
　　 As long as you get rid of the enemy, you have a chance to make a comeback.
　　 Especially when facing a large number of enemy aircraft, the speed is simply the Dugu Nine Swords in the Swordsman.
　　You want to fly a kite?
　　 You want mangu?
　　 Do you want to defeat each one?
　　 Are you going to lure the enemy into deep?
　　 Do you want to go straight?
　　 Do you want to go slant?
　　 will do.
　　 As long as you have enough speed, you can do whatever you want.
　　 Yes, just do whatever you want.
　　 In air combat, there is speed, and you can really do whatever you want.
　　 Then, here comes the problem.
　　 It is not easy to break through Mach 3.
　　 In addition to the very powerful engine thrust, the coordination of other parts is also required.
　　 Especially the fit of the fuselage skin.
　　Aluminum skin cannot withstand extremely high temperatures. Once it exceeds 200 degrees, it will become soft or even melt.
　　Titanium alloy? Of course titanium alloys can.
　　 But, titanium alloy is too expensive. Can not afford.
　　 Then, the only choice is stainless steel.
　　 Good quality and low cost.
　　 Therefore, the outer skin of the first machine is stainless steel.
　　 In a sense, the stainless steel appearance of the J-8 is a bit like a replica of the MiG-25.
　　 But its engine life is much stronger than the MiG-25.
　　 From the initial test to the present, 125 has been in operation for more than 500 hours.
　　 No malfunctions have been found for the time being.
　　 Purely theoretically, it is simply a perfect engine.
　　 reliable.
　　 stable.
long life.
　　 No need to refuel.
　　 Looking around the world, are there other engines that can be compared?
No.
　　 certainly not.
　　 Now is the moment when it soars into the sky.
　　 "Chief Engineer Wang, according to your theoretical calculation, what is the maximum flight speed of the first plane?" Li Tonghe asked.
　　 "Without any weapons, the take-off weight is 18 tons, the height is 20,000 meters, and the theoretical maximum speed can exceed Mach 8." Wang Bu'an said cautiously.
　　 "What if you are at an altitude of 35,000 meters?"
　　 "Mach 63112."
　　 "What if it's 40,000 meters in the sky?"
　　 "Mach 55614. But I suggest you do not exceed Mach 5. I am worried that the appearance of the fuselage will not be able to bear it."
　　 "The exterior of the fuselage is stainless steel, which is very strong. It can withstand high temperatures of 800 degrees."
　　 "But there are bubbles in the welding of the wings and fuselage. At an altitude of 40,000 meters, the difference between the internal and external pressures is too large, and the bubbles will expand. The weld may crack."
"I remember."
　　All people behaved very professionally.
　　 Of course, Wang Buyan also has to be very professional. The data is accurate to four decimal places.
　　 "What about the maximum overload?"
　　 "16."
"How many?"
　　 "16."
　　 Li Tonghe, Liu Zhenhua, Yuan Zhen, Zheng Jincheng and others looked at each other.
　　 Immediately, their gazes focused on Wang Buyan's body in astonishment.
　　16's overload?
　　God!
　　 This overload is terrible.
　　 You need to know that the maximum overload that can be withstood in the entire flight test group is only 9.
　　16 will definitely cause the test pilot to lose consciousness.
　　 Is Wang Bu'an wrong?
　　 Will there really be such a big overload?
　　 "I made no mistake." Wang Bu said calmly.
　　 "Speak carefully." Liu Zhenhua said solemnly, "This problem is very serious. It must be resolved."
"First of all, the design of the J-8 itself causes its high-speed performance to be too good and it is too easy to accelerate." Wang Bu'an said methodically, "Its original design is a high-altitude high-speed fighter, emphasizing fast flight. So, once it is the thrust of the engine Enough, its speed is easy to increase. If the speed increases too fast, the result is excessive load."
　　 "Is there no balancing measures?" Li Tonghe frowned and said, "The load exceeds 8 and it is very dangerous."
　　 "It's a pity. No." Wang Bu'an said bluntly, "The original design of the J-8 did not take this into consideration. There is no need to consider it."
　　 Li Tonghe and Liu Zhenhua looked at each other again.
　　 Yuan Zhen and Zheng Jincheng also frowned.
The overload of 　　16 is unbearable anyway.
　　 This cannot be solved by the will of the test pilot.
　　In the history of world aviation, the largest overload record is around 9. Above 9, the test pilot will definitely be unconscious.
　　 "Is there a solution?" Liu Zhenhua asked.
　　 "Yes. Limit acceleration." Wang Bu'an replied calmly.
　　 "How to restrict?"
　　 "Human control."
　　 "No. Pure human control is unreliable. An electronic control system must be installed."
　　 "That's right. An electronic control system must be installed."
　　 Wang Bu'an's opinion was rejected.
　　 Relying solely on the control of the test pilot? It definitely won't work.
　　 In case the test pilot makes a mistake in operation and causes an overload overflow, he may be unconscious before he can react.
　　 Fortunately, it is possible to install an electronic alarm device.
　　 Once an overload is found, an alarm will be issued immediately.
　　At the same time, the power output is automatically limited.
　　 This belongs to Yuan Zhen's design scope.
　　 Yuan Zhen said that the problem is not big.
　　 "Okay~EbookFREE.me~ This problem is solved." Liu Zhenhua nodded.
　　 "Next question." Li Tonghe continued, "Engine afterburner time."
　　 "There is no limit." Wang Bu'an replied.
　　 "Are you sure there are no restrictions?" Li Tonghe asked cautiously.
　　 "OK."
"it is good."
　　 Liu Zhenhua interrupted suddenly: "Nevertheless, let's limit it. For the first test flight, the afterburner state cannot exceed 10 minutes."
　　 Li Tonghe nodded and said, "Okay. I think so too."
　　 Wang Buyan habitually curled his lips.
　　 too careful.
　　 What's the use of 10 minutes?
　　125 In fact, there is no such thing as afterburner.
　　 There is only the difference between a normal throttle and a high-horsepower throttle.
　　 However, other people are professionals, and since the decision has been made, he will not question it.
　　 Generally speaking, the result of this meeting is quite satisfactory.
　　 Then it’s meal time.
　　 Then it was night.
　　 take a bath.
go to bed.
　　 Rejuvenate energy, wait for the next day.
I'm going crazy. Update 17,000 words today! I hope everyone will not abandon me. Ask for a recommendation!
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