Two days ago, I posted an animated picture of an unlucky child who was playing RPG-7 indoors. Then I saw various statements in the comment area, such as baked and fumigated. So this article also specially made a popular science, and I will briefly talk about the differences between several types of individual tubes. The content is very basic, just do it for the big guys~
Let’s start with World War II . At that time, several types of tubes were very easy to distinguish, and the principles were very different. For example,
Iron Fist , this super-caliber big head stick is the standard recoil-free cannon . There is a 54 grams of black gunpowder in the jar between its warhead and tail fin as the launching medicine.
Of course, using 54 grams of black gunpowder to launch a mass of more than 3 kilograms of warhead cannot be able to withstand humans, so the rear of the iron fist body tube is empty, and the recoil shock wave and flame during the firing will be discharged from the back of the body tube to achieve the effect of balancing the recoil. This is the so-called recoilless gun principle, but when the recoilless gun is fired, a lot of kinetic energy is absorbed by the body tube, and the iron fist's body tube is not thick, so it will be destroyed after being fired, but its original intention is to use it once.
Of course, this super-caliber Iron Fist anti-tank tube warhead is very heavy, with an initial velocity of only 30m/s and a range of only 30 meters. Many times, soldiers who fire this disposable tube are also disposable...
Bazuka , in the standard sense, rocket launcher , the warhead has a rocket engine, so its range is much higher than that of the iron fist such as recoilless cannon. During launch, the rocket is ignited in the body tube and injects it backward to provide power. At this time, the entire rocket body is a pure launcher and does not need to bear too much pressure. Therefore, real rocket launchers can generally be reused, and the weight will be greatly reduced after being replaced with fiberglass.
Of course, the tail flame behind the bazooka will be much larger than the recoilless cannon. And the even more fatal problem is that the tail flame that is sprayed backwards after the rocket flies forward and then shoots out of the body tube, so you either use a baffle or wear a mask.
To understand it simply, the bazooka is similar to the sky-piercing monkey, and the recoil-free cannon is similar to the second kick.
Yes, there is also a PIAT. The launch principle of this product is similar to that of mortar . I have written it before, so I won’t talk about this article.
Back to the topic, there are two problems in front of you now. One is that the range of the recoil-free cannon is too close, and the other is that the bazooka is easy to burn the shooter. So is there a comprehensive solution? In fact, a batch of reusable recoilless cannons were used at the time of World War II, such as the German LG40
um... Well, this thing with more than 300 kilograms cannot be considered a single weapon
M18 recoilless cannon , the initial speed is 370 meters per second, the effective range is 450 meters, and the maximum range is 4 kilometers. These indicators look perfect, right?
No, because it is a recoilless cannon, its pipe wall needs to bear pressure and be thick, so it weighs 20 kilograms, and it is a rifled cannon with a caliber of only 57mm, which leads to not much charge of warheads and a depth of only 76mm. It is OK to use it as an infantry cannon to dismantle the bunker, but it is a big deal to dismantle tank .
By the 1960s, the development of individual tubes entered a new era. In terms of RPG-7,
is actually a mixture of the characteristics of a recoilless cannon and a rocket launcher. Didn’t we say that the recoilless cannon was either too close or the pipe wall was too thick and too heavy. If rifled, it would not exceed the caliber and lead to low penetration?
RPG It first ignites a small amount of launching medicine in the chamber to let the warhead fly out, and then ignites the rocket engine at the tail of the warhead to accelerate 10 meters away. In this way, a small amount of ejection medicine does not need to make the cylinder too thick and control the weight. The warhead flew out 10 meters and then turned on the rocket engine would not cause the tail flame to stick to the shooter's face. Moreover, the super caliber warhead was loaded enough, nothing could not be solved by a single RPG-7...
If the text description is just too abstract, look at the animation picture under of the high-speed camera above. After the RPG7 warhead flew out, there was a clear secondary ignition propulsion lens.
So, the correct understanding of RPG-7 should be "the recoilless gun that fires rocket extended-range grenades", or directly asks it to advance the grenades. Since there is less recoil-free launching, the tail flame is not very exaggerated, and 15-20 meters behind is a dangerous area.
And the Americans developed the M72 LAW
This thing is also a rocket launcher, but unlike traditional rocket launchers, this rocket engine uses high and low pressure launch technology, and the fuel will quickly burn in the high-pressure area in the barrel. After the bullet flew out, the rocket engine has completed its work and relied on inertia to fly, which solved the problem of gas-burning face.
Furthermore, it is a rocket, and the body tube can be directly made of fiberglass and aluminum tubes. It is a disposable weapon, with a weight of only 2.3KG (different models have different weights), and it does not take up the preparation and is very flexible in ration.
(M72's explosion-wave danger zone, 70 meters)
However, the effective range of M72 is 200 meters, and the penetration and damage effect of the 66mm warhead is not very ideal. The initial speed is only 145 meters/second. The accuracy of some mobile armored vehicles is not very good. Later, NATO people replaced AT4
This thing is another recoilless gun. However, technology has improved, and the enhanced glass fiber cylinder can withstand the chamber pressure when the launcher is pushed, so the weight is OK, 6.7 kg. Like the M72, AT4 is also a disposable tube, but the large charge causes the 100 meters behind it to be a blasting area
in the wild, but it is not a big problem in the air, but it is very bad indoors, especially in street battles, so Saab Power Company later launched a batch of AT4 CS versions (Confined Space, limited space), which will spray salt water from the tail of the barrel to balance the recoil, which greatly reduces the blasting range and is much lower in temperature. The problem of narrow space emission has been solved to a certain extent, but the weight is larger and the initial speed is reduced. We call this balancing ejection technology.
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