Why is the Su 27 engine so far away

The aerodynamic shape of the Su-27 was designed by the Siberian Academy of Aeronautical Sciences. The shape of the MiG-29 is also from this research institute.

This profile is typical of a lift-body shape, characterized by a large area of wing-body fusion, as well as side-spaced air intakes and engine compartments. There was a huge "ditch" between the two engines.

The advantage of this lifting body shape is that the lift coefficient is very large, not only the wing can generate lift, but the entire fuselage can generate lift. The "groove" between the two intake tracts and the engine can act like a pocket to trap the airflow when flying, thus generating additional lift.

In addition this "ditch.""It can also play a role in stabilizing the direction and playing the role of a partial hanging tail. Especially when flying at high angles of attack, the vertical tail effect decreases, this"ditch"It can play a great role in compensating for it, making a great contribution to the stability of the direction and avoiding the loss of control and tilting of the aircraft. The Su-27's ability to easily make a "Cobra" maneuver also has a lot to do with it.

But there are also downsides, this"ditch"The presence of the body leads to a large infiltration area, resulting in high friction resistance, which is slightly unfavorable for high-speed flight. In addition, the engines are spaced apart, which leads to weight dispersion, and the moment of inertia of the aircraft is large, which causes the Su-27 series to roll not as well as other aircraft of the era.

The aerodynamic shape of an aircraft is always the result of trade-offs, there can be no perfect design, the important thing is to see the designer's choice. Whether the design requirements are met. This lifting body shape of the Su-27, although not perfect, is also an excellent and classic design example.

I don't understand your question, are you asking how far the engines are arranged on the fuselage? Or ask the engine?

The tail spouts are leaking outside, one is good-looking, and the other is that the ass is too hot and needs to be dissipated!

Su-27 is a heavy fighter made in the former Soviet Union, because it is equipped with two engines, so it can obtain higher speed, when landing, in order to ensure that the aircraft can reduce the speed of the aircraft in a short distance, so it is equipped with a parachute in the tail cone of the aircraft, which is also a common deceleration method for heavy fighters.

The two engines of the Su-27 series aircraft are far apart, and due to the ejection of the tail jet flow between the engines, there will be a great bottom resistance, resulting in great flight resistance, and the impact of low-altitude flight is particularly serious. There are two solutions: one is to bring the two engines closer together and arrange them as close together as possible, and the other is to arrange a cone between the two engines, with the tip of the cone until the fusion of the jet air of the two engines.

It seems to have a parachute inside.

The Su-27 is used to seize air supremacy and fight with the opponent in the air, not for ground attack, and the high bomb load does not make much sense.

The performance of different aircraft is different, and aircraft that mainly attack ground need to pursue a relatively large bomb load, but air superiority fighters do not. Although the Su-27 has a large body size, a large lift coefficient and a powerful engine, these are for improving maneuverability, not for bomb load.

For example, a person has good physical strength and can run 100 meters in 10 seconds and carry 200 pounds, but he cannot be required to carry 200 pounds of things to run 100 meters in 10 seconds.

The maximum bomb load is mainly determined by the layout of the aircraft pylon; when the bomb load is constantly increasing, the aircraft take-off thrust ratio will be lower and lower; in order to take off at a short distance, the attack opportunity that does not require air combat maneuverability uses wings with a small sweep angle and an airfoil suitable for low speed; in this case, the maximum bomb load is actually limited by the number of pylons and the load-bearing capacity of the pylons; the A6, whose engine thrust is much smaller than that of the Su-7, can carry 8 tons, while the Su-17 can only carry 5 tons However, the design itself is unreasonable, resulting in his low bomb load, Soviet-made aircraft due to backward technology, heavy on-board equipment, so when the engine thrust is the same as that of American-made aircraft, in order to control the empty weight of the aircraft, can only reduce the structural strength of the aircraft, which makes the wing relatively thin, unable to carry a large weight, and the landing gear of the Su-7 is retracted in the wing, and the inside of the wing, which is most suitable for bomb-loading, is occupied by the landing gear, which leads to a further reduction in his bomb load.

First of all, the structural strength of the fuselage is not good, and the second engine is much worse than in the West.

Fighter fighter fighter.

Hanging too much ammunition affects maneuverability How to fight with enemy planes in the air.

Foreign high-precision technology is not something that can be obtained by importing, especially the high-temperature, high-pressure-resistant metal materials used in aero engines, which could not be provided by China at that time.

At that time, I wanted to continue working on the turbofan 10

The Mirage 2000 considered the best problem, in which the United States also promoted the F14 and the monkey version of the F16 like China to stir up, but at that time China's economic level was really too expensive. After the easing of Sino-Soviet relations, they began to consider the introduction of Soviet-style fighters, and the payment methods were flexible, and some of them could be bartered, which was very advantageous for China, which could not come up with enough US dollars. The Su-27 is a heavy fighter, as a country as large as China needs an aircraft with a large range, a large combat radius and strong firepower, a heavy fighter is the best choice, including the short-legged MiG-29 directly gave up.

The shortest is 400 meters, and the full ammunition is 800-1200 meters, and the landing depends on the level, and the test pilot can land within 400 meters.

Exposed is the tail nozzle.

The temperature here is too high, and the paint is quickly scrapped, so the hair is omitted.

Maozi's consistent rule is to ensure the basic functions, and don't care about the rest.