"So close?" Qin Feng heard the words of Lao Chang, and was immediately extremely shocked, although Qin Feng knew that when refueling in the air, the distance should be very close, but there was no such close, if the two planes were refueled in the air at the same time, one from the left side and the other from the right side, in this way, the two planes must be relatively close, but the distance from the refueling plane in front of them is still not short, and it is absolutely impossible to reach the limit of 0.6 meters.

Now, Qin Feng is very strange.

"Yes, our air refueling pipes are shorter than those in the West." Lao Chang explained to Qin Feng.

The principle of air refueling of hose is not complicated, air tanker, as long as you add a pod, this pod has a full set of equipment, including fuel pump, including refueling pipe and conical sleeve, as long as the aircraft is installed with this device, it can be refueled normally, and it is easy to modify.

In order to break through the technology of air refueling, China also learned from the West, after the West has inspected, it imported several sets of MK32 air refueling pods used in VC-10K air tankers from the United Kingdom, and then, after eating through the technology of this air pod, they imitated it and used it on the bombing oil-6 in front of it, codenamed RDC-1.

RDC-1 refueling pod, the shape is streamlined, from the tail, you can even see its refueling cone sleeve, and then inward, is the hose in front of the cone sleeve, the hose is connected to the wing, leading to the fuel tank, in front of the refueling pod, is a small wind turbine, which is mainly used to drive the release and recovery of the cone sleeve hose and so on.

Now, facing this device, Qin Feng knows that although this is already very common for the Western world, for himself, it is definitely a zero breakthrough, but since it is imitated from the West, why can't our refueling hose be longer? In this way, the rear oil receiving machine can be farther away from the front fuel dispenser, and it is also safe.

"For this project, Xifei has done a lot of work, including wind tunnel experiments, behind this H-6, there is a turbulence area, if the hose is too long, then just enter the turbulence area, at this time, refueling will become impossible, and even cause danger."

Refueling in the air is like walking a tightrope in the air, and if you are not careful, it will cause terrible consequences, for example, it will cause the plane to collide in the air, and it may even hit the tanker in front, where there are dozens of tons of fuel, as long as it collides, there will be a terrible explosion.

Therefore, it must be done according to the laws of science.

The first is the wind tunnel experiment, in the wind tunnel to determine the safe distance of air refueling, this wind tunnel, everyone is very nervous, the turbulence area behind the fuselage is too large, if the distance of air refueling is controlled closer, it will be better.

It's definitely not a matter of adding a few meters of hose.

This is also due to the fact that the layout of air tankers is different from that of Western air tankers.

Western ones, which are generally modified from airliners, are usually in the form of four engines flown under the wings, which has proven to be the most suitable layout.

Four engines, which spew parallel exhaust gases backwards, and the airflow in the tail is also stable.

But the H-6 is not, the H-6 uses a special wing root engine layout.

For example, the first ME262 was hung on both sides of the wings, and later, under the belly, the MiG-9 was such a weird guy, and the two engines were side-by-side horizontally and vertically.

After many years of research by the designers, the current layout was finally determined, fighters, all put the engine on the buttocks, and transport aircraft, bombers, almost all of them are hung layout, this layout of wing roots, once popular for a while, but then they were all abandoned.

The wing root is arranged with the engine, the engine is close to the fuselage, and the wing is like extending outward from the engine, not only the Tu-16 is in use, but even many passenger planes are also in use, such as the British Hunter anti-submarine aircraft, Comet passenger aircraft, Victor bomber, etc., these are all extended from a mold, and the engine is installed on the wing root.

In the early days, due to the strength of the aircraft body, especially the wing part, if the engine is hung, the load is not enough, not only to carry the weight of the engine, but also to carry the thrust of the engine.

It also has the advantage of arranging the engines at the wing roots to reduce drag and increase the speed of the aircraft.

However, the disadvantages of this design are also very great, the engine is next to the fuselage, the noise or something is transmitted to the interior of the aircraft, it is quite uncomfortable to ride on the comet airliner, the heat dissipation of the engine is also inconvenient, it is easy to lead to overheating, the exhaust gas blown out by the tail nozzle directly roasts the fuselage, the fuselage is even more uncomfortable, this layout has a great impact on the air intake, which is not conducive to the engine air intake and so on.

And now, this layout has a drawback, which is that it has more turbulence areas in the tail.

If it is a bomber, it doesn't matter, after all, the bomber formation is often tens of meters or hundreds of meters, and will not fly into the opponent's wake area, but the air tanker is different, this hose can't be dragged for hundreds of meters, right?

"This plane, in fact, has also undergone a lot of improvements." I often introduced this bomber to Qin Feng, after all, there is nothing to say about the J-8 tanker, it is just to add an air tanker, what is needed is the pilot's superb skills, and the bomber six, there are many special places.

What can be seen is the air refueling pod hanging under the wings, and the other is the cover of the nose, in fact, if you look carefully, there are a lot of modifications in the details.

"Its tail turret is bigger." Qin Feng immediately found out, it was very like everyone was here to find fault.

During World War II, bombers formed formations, in order to prevent the sneak attack of fighters, they would arrange a dense variety of turrets, the tail as the focus of defense, of course, there were turrets, and now, in modern air combat, there will never be aircraft biting the tail to attack with a cannon, this tail turret, in fact, should have been canceled a long time ago.

Now, it's bigger here.

Of course, it's just that the turret is bigger, there are no aerial guns in it at all, and this enlarged tail turret will carry an observation post inside, where it will be easier to observe the docking situation.

Then, of course, we will have to install additional radio devices, so that we can call the pilots of the fighters directly.