Back then, when there were just airplanes, they were open-topped, and the pilots were wearing flight caps and goggles, and at the same time, they had to wrap a scarf around their necks, and the role of this scarf was to wipe the goggles, and the engine in front of them was lubricated with castor oil, and from time to time there would be oil splashing out and splashing on the goggles.

This lasted almost until World War II.

War is the catalyst of science and technology, this sentence is absolutely true, look at the outbreak of World War II in the past few years, the development of science and technology is a blowout, almost equivalent to a hundred times in peacetime!

Before World War II, tanks were all light tanks of four or five tons, with only a few tens of horsepower, the size of a pee, and by the end of World War II, not to mention dozens of tons of Tigers, engines of several hundred horsepower, and at the same time, there were thousands of tons of Land Cruisers on paper!

Before World War II, fighters were also biplanes of two or three hundred kilometers per hour, and there were very few monoplanes, and as for the cockpit, it was almost always open, but what about the end of World War II? Jets with 800 kilometers per hour are available, and propeller planes can fly up to 6 or 700 kilometers.

In World War II, technology developed rapidly, but the army was a conservative and nostalgic service.

With the gradual acceleration of the speed of the aircraft, the aircraft designers are also aware that the cockpit must be fully enclosed, so as to reduce air resistance and achieve greater speed, however, the pilots are not happy, they would rather not pursue the ultimate speed, but also like to open the cockpit canopy to fight, you can see that most of the aircraft, when taking off, the cockpit canopy can be buckled, but they are left behind, they don't like to buckle, in this way, the field of vision is small, the cockpit canopy of the partition is quite blocking the line of sight, if the enemy aircraft is in the box, then it will not be visible.

At the same time, due to the poor technology at that time, especially in the Soviet Union, the cockpit canopy was used for a while, and traces were drawn on it, which were scratched!

Moreover, open the cockpit canopy, that is also for convenience, this is not only to breathe fresh air, but also in case of being shot down, easy to escape, the pilot after finding that the plane can not be controlled, as long as the plane is operated upside down, and then kick the legs, it will get out of the plane.

It is precisely because of this that the American P-39 plane, when it uses the cockpit entry and exit method like a car door, is criticized by everyone, and it is definitely not easy to get out of here. Aircraft designers design planes with ass!

Although they didn't like it, in the later stages, as the speed of the plane continued to increase, they still had to obediently close the canopy, otherwise, the wind outside would let them know the consequences of such conservatism.

A simple canopy, the technology is constantly evolving.

The most technologically advanced is the Americans, which is vividly reflected in their F-16 fighter jets, this kind of canopy is a whole, directly buckled down, bubble shape, looks quite beautiful, and at the same time, the vision is also good.

A little behind, that is, the F-15 fighter, there is a windshield in front, and the cockpit canopy is divided into two parts.

There is a windshield in front, and the cockpit canopy is flipped backwards, but the whole cockpit canopy is quite compact and small, and the front windshield is a three-piece type, and the bulkhead is too obstructive of the view.

But there is no other way, if you make a one-piece curved windshield, from the factory's point of view, there is no problem, however, this will bring serious aiming problems, curved windshield, the optical system will be distorted, and you can't do it when you don't have the ability to solve this correction problem.

Even if it is an F-14 fighter, it is a three-piece windshield, which is why it is not possible to have a heads-up display, and the head-up display is set on the target, can it hit? If the front glass is flat, then it is fine, but if it is curved, it has to be corrected, and in the era when the F-14 appeared, this problem was not solved, so it had to be made into a three-piece type.

The same is true of the J-7, and the domestically produced ones are almost all like this.

At the moment of takeoff, Qin Feng could still recall all of this, and what Qin Feng didn't know was that this time, because of the cockpit canopy above his head, there was a big problem, which almost caused Qin Feng to have a serious flight accident.

As in peacetime, the fighter skillfully left the runway, and when the fighter's own performance test was not completed, it would not carry missiles.

At the same time, the second J-7 is also in full swing production, and it won't be long before 03 prototypes will follow the test flight.

"001 report, everything is normal." Qin Feng was wearing an oxygen mask and fastened his goggles, and now this direction of flight happened to be facing the sun, and he looked at the instrument below him, everything was normal.

Compared to the terrible tremor of the first test flight, the current flight is much better, of course, there will be the roar of the engine from the tail, but when it reaches supersonic speed, the surroundings will immediately be quiet.

"Keep climbing." A command came from the headset.

The J-7 is a heavy aircraft, so its climb seems slow, and at the same time, in order to save fuel, this time Qin Feng did not turn on the afterburner, and when he was ready to fly over supersonic speed, it was the time when the engine was blazing.

Now, the fighter is constantly climbing upwards, and at the same time, it is also possible to test the rate of climb of this fighter, although it has been tested before, and this is also a good opportunity.

Two thousand meters, three thousand meters, and soon, layers of white clouds flew over, and the earth looked more and more distant, more and more blurred, and the sky, brighter and brighter.

Six thousand meters, seven thousand meters, when it flew to seven thousand meters, Qin Feng leveled the plane.

"Report, the specified altitude has been reached."

The higher the altitude, the lower the air resistance, so the easier it is to fly at high speed, and the maximum speed of various aircraft is almost always achieved at an altitude of more than 15,000.

However, the higher the altitude, the more dangerous it will be, so the initial test flight mainly started in the air below 10,000 meters, and this first flight at supersonic speed was chosen at an altitude of 7,000 meters, so that once something goes wrong, it is easy to save.

"Align the course and prepare to start the test." Voices came from the headphones.

"Understood, now align with the course and turn on the afterburner!" When Qin Feng turned on the afterburner, he felt the long-lost feeling of pushing his back again.

When the fuel was bubbling into the afterburner for combustion, the power increased significantly, from 54 kN to 91 kN, and the fighter began to sprint forward!