In the design of fighter jets, there is a very important indicator is the fuel load coefficient in the aircraft. The ratio of the weight of the refueled to the full weight of the fuselage with a full tank of fuel inside the fuselage.

The fuselage is full weight, and it also depends on what task it is doing, air combat and surface-to-ship attacks are absolutely different, and an air-to-ship missile may be several tons.

Therefore, this full weight is generally commonly known as a typical air combat mount, so that the data is the best, and the coefficient is about 25% for general fighters, such as the Mirage 2000.

The F16 was originally designed with the F15 in mind, so the range is more preferred, and this indicator is 28%.

To say that the king with the largest coefficient is definitely the Su-27, as long as you look at the various appearances of the fighters, European fighters often hang three super large auxiliary fuel tanks. And the Su-27, which has never been, has hardly ever seen it with an auxiliary fuel tank, because this kind of fighter has a terrible fuel load coefficient of forty percent!

Before the Su-27 and MiG-29 came out, almost all fighter engines were inside the fuselage, so that the engines took up a lot of space, and the layout of pipeline equipment led to a relatively small internal oil coefficient.

Here, the most interesting thing is the F15 fighter, its two engines are stuffed in the fuselage, there is almost no place to arrange the fuel tank behind the pilot's cockpit, and the combat radius of the early F15 model is only about 800 kilometers when all the internal oil is counted, and the auxiliary fuel tank and the type protection fuel tank are also the standard configuration of the F15 fighter during the combat period.

In this way, the F15 fighter has achieved the thrust-to-weight ratio of more than 1 in normal air combat, and their designers have no other way to achieve it by reducing the weight of the aircraft, which can be regarded as a trick.

The Su-27 is different, the two engines of the Su-27 are almost hung on the plane in the form of a pod, not installed inside the fuselage, the air intake is in the belly of the aircraft, and the fuselage does not interfere with each other. Moreover, the distance between the two engines is relatively wide, so the fuselage is also much wider than the average third-generation aircraft.

If you look at the top view, you can see that the middle section of the Su-27 is much wider than that of the F15 fighter. In addition to its wing body fusion fuselage, the space inside the aircraft is very huge, and the space is very large, and the fuel in the wing box can reach more than nine tons in total!

That's right, if it is a fighter like the MiG-21, the total take-off weight does not reach nine tons, and the Su-27 has a terrible in-flight fuel load, compared to the F15, which is only a little more than six tons.

In this way, the Su-27 fighter can reach a range of up to 4,000 kilometers without carrying auxiliary fuel tanks, which is quite tough, and it can be said that it does not need to carry auxiliary fuel tanks at all.

Of course, this is a later story, the current Mirage 2000, which is a medium-sized fighter, has no way to compare with a twin-engine heavy air supremacy fighter like the F-15, and its M53 engine, also known as the turbojet in the turbofan engine, has a fuel consumption rate that is not low, in this case, its range is very short.

In order to increase its range, of course, it is necessary to use auxiliary fuel tanks.

This is also a common way to increase the range, but such a huge auxiliary fuel tank still has a great visual impact.

The shape of this auxiliary tank is streamlined, and it looks like a bomb. (Even Huadong Zhixiong, at the beginning, thought that the auxiliary fuel tank was a super bomb mounted by a fighter.) ）

The drop fuel tank must be streamlined, which can greatly reduce air resistance, and when abandoned in the air, the drop fuel tank can also be as smoothly as possible to follow the parabolic trajectory out of the aircraft without crashing into the plane due to a large rollover, and even some drop fuel tanks are equipped with a tail to ensure this.

In this way, the design idea of the auxiliary fuel tank has the same points as most low-resistance bombs, and it looks somewhat similar in appearance.

Actually, the auxiliary fuel tank at some times, it is still possible

Let's make a cameo role as a bomb, this thing is a big oil can anyway.

Before entering the battle, the auxiliary fuel tanks were thrown away, which was just a one-time consumable, so during the battle, some pilots felt that instead of throwing these flammable and explosive materials everywhere, it was better to throw them on the enemy's head and let them burn.

During the Vietnam War, after the U.S. military used incendiary bombs to carry out air raids, some planes with auxiliary fuel tanks simply threw these large iron lumps filled with oil on the heads of the ground fighters who were burning below, turning the bottom into a sea of fire.

Now, looking at this fuel tank, it is extremely visually impactful, and after this heavy plug-in is hung up, will it have a great impact on the control of the aircraft?

Not to mention anything else, at least, after flying, the roll of the fighter will definitely be reduced, after all, the wing of the fighter is loaded with so many heavy objects, the moment of inertia will definitely be very large, such an aircraft is quite cumbersome and difficult to control.

If yesterday's test flight had only one missile attached, these people would not have realized the powerful performance of the Mirage 2000 and today's fully mounted, it would have surprised these people.

Just look at their expressions.

The Dassault personnel present were very proud, and in the past few days, Boileau has been following the entire delegation, and if the delegation is slightly dissatisfied, he will try to make the other party change their impression.

Today's full load, really surprised the other party, if it is the other party's plane, this kind of load, it is impossible to fly.

That's right, take the J-7 fighter as an example, its take-off speed is high, and the airfoil determines that its take-off and landing speed will not be too low, so even if it strengthens the pylon, it can't hang too many things, otherwise, under the impetus of the weak engine, it can't fly at all.

In later generations, it was not until the wing was changed and the structure of the double delta wing was adopted that the take-off and landing speed was reduced and the maximum payload capacity was increased.

In everyone's eyes, I have never seen someone who can hang so much and still fly, let alone fly easily.

With such a question, Qin Feng sat in the cockpit.

As usual, turn on the afterburner to take off, and sure enough, loaded with a full load of heavy objects, the taxiing distance required for take-off is very long, almost a thousand meters away, Qin Feng pulled up the operating stick, and the moment the fighter left the ground, Qin Feng felt relaxed again.

That's right, the power problem of the engine is obvious under full loading, because the thrust is insufficient, the take-off is slow, but this has nothing to do with the operation, he now pulls the operating lever, and the amount of the lever for normal take-off is the same!

Just before takeoff, I moved the conversion gate of the flight control system to the position of "with external objects", which must have changed the control law of the aircraft flight control system!