The 30 mm aircraft gun is not equipped with many domestic fighters, even if it is the J-8 day fighter that is about to go through all the test flight projects, it is only the only one equipped with a 30 mm aviation gun, and the J-8I fighter that will be carried out later will be replaced with a 23 mm aircraft gun again.

Not to mention anything else, the reserve ammunition of only 50 rounds is not enough in any case, and its aiming system is even more backward.

Due to the use of optical system, this system first needs a few minutes of heating time, taking the common domestic ai-7 sight as an example, its heating time is about 3-10 minutes.

In other words, after takeoff, if you suddenly encounter a sneak attack from the enemy, well, you have to keep dodging and wait for the system to heat up.

Heating is only the first step in a long march! Then you have to judge the enemy aircraft type based on the enemy situation report or visual contact, turn the wingspan knob, select the wingspan scale, which must be memorized, you can recognize it at a glance, know what kind of aircraft the opponent is, know what the width of the opponent's wing is, because you have to use the enemy's wingspan as a benchmark for ranging, which is the same as the tank crew's system.

Then, pull the ring selector lever to the active ring position; Press the ring stabilization button to increase the current of the advance angle coil, speed up the precession of the gyro, and make the ring follow the motion state of the machine; Rotate the ranging handle to enlarge the aura, which is convenient to narrow the aura to wrap the target, and increase the current of the advance angle coil at the same time; Estimate the elevation angle and advance angle, place the halo above the front of the target, release the ring stabilization button, reduce the aura, the aura moves backwards and downwards, and the center light point slowly falls on the target.....

That's all done, okay? Of course not, this is only the second step of a long march! If you start now, then it is not surprising that not a single shell will hit the target!

This is followed by the decisive and precise aiming steps: "follow", "wrap", and "steady".

The pilot must basically align the center light point and press it on the center or critical position of the target, firmly follow the target, and measure the linear angular velocity of the target; At the same time, the ring is narrowed by rotating the ranging handle, so that the inner tip of the prismatic light point that makes up the ring surrounds the target, and according to the projection ratio of the enemy plane, the tightness of the encirclement is grasped, and the target distance is measured to form a comprehensive correction angle.

After that, what to do is to keep this state stable and track the target for a certain period of time; If the pilot's completion of the previous steps is of good quality, then the speed of the sight adjustment of the comprehensive correction angle is relatively fast, and the fire can be fired after 0.5~1.5 seconds of stable tracking.

Since the enemy will not fly smoothly and wait for you, in the engagements often both sides are engaged in fierce tactical maneuvers, and the fighters are in a state of strong vibration; The effectiveness of the cannon in this dynamic condition is very tragic, and even just against a target such as a bomber, which is huge, slow-flying, and lacks maneuverability, it is rare to hit at a distance of 1,000 meters.

Therefore, the most common case of cannon attack is to follow the attack curve from a certain range in the direction of the rear hemisphere of the target, close the distance to the range of 300-500 meters, firmly bite the target and then fire.

In fact, in the early days of air battles dominated by cannon dogfights, the most common firing distance of the attacking side was often between 200 meters and 300 meters, and it often got closer and closer in the process of firing, and only more than 100 meters or even tens of meters remained when the target was destroyed.

Therefore, in many cases, if you shoot down your opponent, you will also be injured by the target fragments, and this situation is called an aerial bayonet in China.

The air war after the founding of the People's Republic of China, relying on this spirit, scared the Americans to the point of urine, and established the MiG corridor in the air, but until now, this method has long been backward, and the West has begun to use advanced electronic technology to come up with a hotline that can almost be called by looking at it.

Qin Feng eagerly awaited the emergence of such a system.

Hearing Qin Feng's words, Mr. Gu said: "Now, Lao Tu and they are in contact with the Marconi Company to try to introduce their hotline aiming equipment, and I don't know how it is going. ”

Qin Feng was overjoyed when he heard this, Tu Lao introduced it to the J-7, as long as the J-7 is available, it can also be used on the J-8, but unfortunately most people are not interested in this now, thinking that they have been aiming like this before, and they can continue to do so in the future.

"Really? I'd love to check it out. Qin Feng said.

Unconsciously, he has not returned to Chengdu for more than half a year, and at this time, Qin Feng already misses the comrades of the 172 factory and the comrades of the 611 institute, especially the J-9 project, and he doesn't know how it is going.

Qin Feng is indeed tempted, Mr. Gu has already seen it, but if Qin Feng is allowed to go back to Chengdu, then maybe Qin Feng will stay there and not come back, this situation must be taken into account.

Mr. Gu's eyes rolled, and he immediately thought of a plan.

"Comrade Qin Feng, you haven't taken a vacation since you came to our test flight institute, right?" Mr. Gu asked.

Qin Feng nodded.

"In the past two days, you have just finished flying the test flight of ultra-low altitude and large table speed, you can rest for a few days and give you a vacation."

Holiday? Qin Feng is happy, give me a holiday, then I must go back to Chengdu to have a look, and my bonus from last time, I will bring Song Lao back to do research.

But then, he heard Mr. Gu continue: "You just happened to go to the capital to have a look, in the past few days, Lao Tu and they are negotiating with the British at the Beijing Hotel, Lao Tu and their movements are too slow, a contract, after talking for so long, it is said that the prime minister has slapped the table." ”

Let Qin Feng go to the capital, and he can't go back to Chengdu, he went to the capital, just to see how the project is going, maybe, it can also be introduced to our J-8?

Hearing what Mr. Gu said, Qin Feng could guess Mr. Gu's thoughts, and immediately said, "Okay, then I'll go to the capital to have a look." ”

"You can't stay too long, though, our test flight mission here is urgent. So, go for three days, how? ”

"Okay." Qin Feng said, and his heart had already flown to the capital of the great motherland.

How many people want to go to the capital, to see the Forbidden City, the Temple of Heaven and other famous landscapes, but also to be able to get close to the great leader, and even the latter desire is more urgent.

In the process of becoming a pilot, Qin Feng once came to the capital, it was organized collectively at that time, and the time was very short, this time, he finally had the opportunity to go to the capital again!

When Qin Feng arrived in the capital and saw Tu Lao, he knew how difficult Tu Lao and the others were at this time. And Qin Feng's arrival is a timely rain, because Qin Feng understands English!