After assigning the task, everyone quickly returned to the intensive work.

Chang Haonan had not been involved in the improvement of the J-7 before, so Yao Mengna volunteered to take over the task of briefing him on the progress of the project.

As an aircraft that is not newly designed, there is no extra space inside the fuselage of the J-7 to stuff other electronic equipment, so it can only be largely kept as it is, and the difficulties in the transformation process are actually mainly due to the deformation of the fuselage caused by relatively high intensity in the past few years.

Especially when it comes to some important structural parts, if you make a new one completely according to the data on the original design drawing, you may not be able to replace it.

This is actually a common problem faced when refurbishing a second-hand phone, or upgrading its mid-life life, and it is also why it takes longer to overhaul a machine than to build a new one.

In the future, engineers will generally use 3D laser scanning and 3D printing to solve this kind of problem, but in 1997, Chang Haonan and they could only rely on manual measurement of deformation and the experience of old workers to solve this problem.

Another more troublesome thing is because of the foundation of the old plane.

When the J-7 was designed, the Huaxia Air Force did not even have a few aircraft equipped with radars, and it did not consider such a tall upgrade as electronic warfare modification.

Therefore, there is not enough space reserved for transmission lines, and the aircraft power supply is not a modular design.

Yao Mengna: When they were in the early stage of transformation, they could only choose to let several subsystems share the same power cord and common ground wire.

"Regarding the space of the aircraft, although the structure of the fuselage cannot be greatly changed, we can remove some unnecessary equipment, at least the receiving antenna for passive radar must be installed in the aircraft."

Chang Haonan can not want anything else for the time being, anyway, this J-7 is also closer to the F16CJ in the plan for performing SEAD (of course, there is also an anti-SEAD on the Huaxia side) The air defense suppression combat platform, and full-time electronic warfare aircraft like EA6B and EA18G must still be redesigned on the J-11 platform in the future.

But as the basis of the whole improvement, the signal receiving antenna of the passive radar is absolutely indispensable.

"Unnecessary equipment?"

Yao Mengna and Tang Changhong, who were standing next to the plane, were stunned.

There is no unnecessary equipment on such a thing.

"Like a cannon."

Chang Haonan stepped forward as he spoke, and patted a double-barreled 23mm cannon in the lower right corner of the J-7 fuselage.

"The nose position must still be left to the original flat slot antenna, so we need two antennas to be responsible for the passive signal reception of the lower hemisphere and the upper hemisphere respectively."

"We can slightly modify the vertical tail of the plane above, and the bottom is installed in the position of the original cannon."

In fact, this is also the common practice of several electronic warfare aircraft later, after all, with the development of the times and the progress of close-range combat missile technology, there are fewer and fewer air battles that can use machine guns.

As for letting electronic warfare planes fight dogs, it is even more impossible for normal people to do it......

"But if the cannon is removed, will the combat capability of the aircraft ......?"

Tang Changhong, the general manager of the new model of Flying Leopard, is still more worried.

This is not just a matter for the aviation industry sector.

In the mid-to-late 90s, the training methods and organizational capabilities of the aviation units were still far from being as flexible as they were later.

It can even be said to be a bit dogmatic.

For example, at the beginning of this year, the Air Force conducted exercises and training on new tactics, all of which had to be mobilized at the level of the whole army.

Of course, there is no way to do it.

Since the overall level of training of the air force over the past 30 years has been indescribable, if we do not carry out such strict restrictions and first understand the basic skills, we simply do not know how many moths will be created.

In this environment where the Chinese Air Force has not even completed its missileization, and its over-the-horizon combat capability is possessed by only a few dozen aircraft, machine-gun combat is the main, or even the only, combat mode for a considerable number of units.

Therefore, in the training syllabus, cannon and air-to-ground fire occupy a considerable share.

If you now come up with an aircraft without a cannon, that means either updating the training standards or coming up with a completely new outline of the electronic warfare aircraft as a new class of aircraft.

Training standards involve assessment standards, and assessment standards involve assessment results, while in peacetime, assessment results are strongly related to a series of personnel work such as awards and evaluations, job promotions, etc.

In short, it is far from being summed up by the sentence "If you don't have a machine gun, you won't practice".

"Take a long-term view, it's not the 70s anymore, missiles have changed dramatically compared to those years, and it's impossible to let electronic warfare planes engage in combat."

Of course, Chang Haonan is aware of the twists and turns, but as the complexity of aviation operations continues to increase, it is imperative to have more flexible training and organization methods.

If it really doesn't work, you can also throw the establishment of this lone seedling aircraft together with the special planes of the Y-8 platform of the North Sea Fleet.

In short, as long as the mind does not slip, there are always more ways than difficulties.

Tang Changhong leaned on the side of the plane and looked down for a moment.

On the one hand, what Chang Haonan said is indeed reasonable, and in recent years, the aviation units of the Navy and Air Force have indeed had the meaning of updating their tactics and training methods.

On the other hand, there really is no better solution.

The landing gear compartment of the J-7 is designed in the fuselage, which has the advantage of freeing up wing space for large-sized ammunition, but the disadvantage is that it occupies a considerable part of the airframe space.

I really can't find a free place anymore.

If the cannon is not dismantled, then the pylons on the center line of the belly can only be removed.

More troublesome.

So in the end, I nodded:

"Okay, change it according to the plan you said."

"In addition, it is necessary to revise the overall power supply strategy, and it is expected that the No. 3/7 pylons and radar systems used in the electronic warfare pod will share the 115V/400Hz AC power supply on one engine, and the rest of the equipment will use another one to avoid shock conduction interference caused by drastic changes in the power of electronic warfare equipment."

"In addition, the power supply network should use a double-wire system and shielding method, and the control cables of each subsystem must do a good job of shielding and laying iron wires, using wave protection sleeves and assembling iron wires 50cm apart to ensure good grounding......"

Chang Haonan said the experiences he could think of one by one, which were all summed up in his previous life in more than ten years of work.

Many things in the project, if there is no master to bring it, then only if you suffer losses can you progress.

For example, the matter of supplying power to the weapon system and the electronic warfare system separately is because in one of the models he has participated in, the passive jamming transmitter and another active jamming transmitter initially share the same "bomb bay E busbar" power supply, and the latter will produce impact interference when powering up under certain circumstances, resulting in the primer of the jamming bomb launcher and the mistaken projectile.

The failure of the "jamming system will automatically drop infrared baits as soon as it works" troubled the project team for a long time, and finally found out that it was caused by the internal resistance coupling of the public power supply.

In short, with Chang Haonan's in-depth involvement, the final stage of the transformation of this fighter-bomber 7 has been smoothly advanced.

Now there is only one piece of the puzzle left from a complete "wild weasel".

Anti-radiation missiles.

(End of chapter)