The second, tungsten alloy armor-piercing shells, was stuffed into the chamber.

The original 100 mm rifled gun's armor-piercing projectile is too poor in performance, it still uses a full-caliber armor-piercing projectile built by World War II era technology, and the armor-piercing ability is only more than 100 mm.

Therefore, although the tank gun exported by the other side can use all kinds of shells in service with the other side, at the same time, it also intends to sell its own armor-piercing shells and make a lot of money, which can be regarded as advanced technology for export.

If you want to penetrate the enemy's armor, the length-diameter ratio of the armor-piercing projectile is an important indicator, and this indicator is naturally the larger the better, on the smoothbore gun, you can use sub-caliber armor-piercing shells, that is, the core diameter of the armor-piercing projectile can be much smaller than the muzzle diameter, so that you can easily increase this ratio.

On smoothbore guns, just add a butt to this core to complete the firing of the shell.

After the cannonball flies out, it is not stabilized by rotation, but by the wing of the tail, which is similar to the reason of a bow and arrow.

However, rifled guns do not.

Because rifled guns have rifling, after rifling, under the restriction of rifling, the shell has to rotate with the inside of the rifling, even if it is on the butt, it will rotate with it.

As a result, the sub-caliber armor-piercing projectile already spun itself off in high-speed rotation before it went out.

With an aspect ratio of more than 5, it is no longer possible to fire in a rifled gun, so for a long time, this shortcoming has restricted the development of rifled guns, until the appearance of sliding cartridge belts.

This is an outstanding invention, this sliding cartridge belt, is sandwiched between the gun chamber and the core, that is to say, the rifled gun makes the shell rotate, the rotation of the motion is transmitted to the sliding cartridge belt, and the shell itself, although it also has to rotate, but the speed has been greatly reduced, and after leaving the gun mouth to take off the shell, because the tail will have a huge rotational resistance to rotation, so the rotation speed will be lower, so that the method of using the rifled gun to fire sub-caliber armor-piercing shells is realized.

With the import of a full set of 105 mm shells, it naturally introduced the technology of sliding the cartridge belt, and then, reducing the caliber, it is logical to use it on the current 100 mm tank gun.

Due to the relationship between chamber pressure, this 100 mm tank gun is destined to be incomparable with a 105 mm tank gun, so the performance of this armor-piercing projectile will also be worse than that of the L7 tank gun, and it will not pose a great threat to domestic self-use when exported.

Besides, in the eighties, the military industry had to be transformed, almost everything had to be sold to make money, and in the later period, even the party fee 3 was sold, not to mention such a small tank armor-piercing bullet.

This is also an important part of winning the 69 tank export contract, when it is time to show a hand, you must show a hand!

At the time of the first shot, the T-72 tank was still ahead, but when the second shot was fired, the two sides fired almost simultaneously.

If there is a high-speed camera inside the barrel at this time, you can see a wonderful scene, the high-temperature gas in the barrel is pushing the butt forward, under the extrusion of the rifling, the sliding cartridge belt is rotating rapidly, and the internal bullet core is just under the inertia of the sliding cartridge belt, with the rotation, and the speed is greatly reduced.

Onward, onward!

The two cores left the breech, threw away the butt, and flew forward, at this time, the atmosphere of the competition on the scene had entered the white-hot stage.

"Grenade, quick!"

"Aim, fire!"

Finally, the grenade, the grenade does not need to pay attention to the extremely high accuracy, as long as it hits near the target, relying on a large area of killing radius, it can also destroy the target, so the gun commander almost roughly aimed to ensure the general direction, and then has stepped on the fire.

Almost immediately after the third gun ejected the barrel, the 69 tank, already on par with the T-72 tank.

"Quick, quick!" Ali shouted loudly, "They are going to overtake us!" ”

Even if it is not the instruction of the Soviets, just out of the dignity of a tanker, he will never want to see his tank surpassed, this is a spirit of always striving for the first, Ali's crew, in the entire army, almost the first, in the confrontation, has never fallen behind.

Now, it has been surpassed by 69 tanks, and that's worth it!

The driver in front was also in a hurry, and the accelerator pedal under his feet had already been stepped on to the end, but in the rumbling sound, the black smoke behind was getting bigger and bigger, and the speed of the tank could not come up.

"Speed up, speed up Lao Tzu!" Ali shouted loudly.

At this time, having finished firing the shells, he had already drilled out of the turret, facing the heat wave, and watched as the 69 tanks began to overtake them!

When you're overtaking, should you upshift or downshift?

The young driver of the manual transmission will choose to upshift, and it was found that after the upshift, the engine roared, and the speed just couldn't go up, and the old driver would lower the gear and pull up the speed to achieve the action of overtaking, as for the automatic transmission, then there was no need to worry, the computer would automatically lower a few gears to achieve the driver's intention.

Now, in the fourth gear, the engine is already underpowered, and the throttle is stepped on to the end, just to make the engine emit more black smoke, so the driver gritted his teeth and pushed to the third gear, this time, the engine finally stopped holding back, quickly pulled up the speed, and in the supercharged howling, the T-72 tank screamed and began to exert force.

Keep racing, chasing, catching up!

Switched to third gear, the speed really increased! Ali looked at the tank over there, the distance was shrinking, and he was happy in his heart, but at this time, the temperature of the engine behind was getting higher and higher, and the low-end throttle was big, and the engine was not hot.

In front of the driver, a red light was already on.

"Report, engine heat." The driver shouted.

The engine is hot! In the desert, high engine temperatures are a common phenomenon, and the best thing they can do is to stop, or even open the armor plate at the back, let the engine dissipate heat, and then turn it on again.

But now, in the midst of such fierce competition, where is there such idle time!

"Leave it alone, keep accelerating for me, it's time to go down the dunes ahead, don't release the throttle, increase the gear!" Ali shouted loudly as he clung to the device next to him, waiting for the violent bump to come.

If you lose this time, will you still have the face to see people when you go back? The most advanced T-72 tank is actually not comparable to this upgrade of the T-55 tank from the East?