Why did the bullet turn?

If you want the bullet trajectory to bend irregularly, which is commonly known as the bullet turning, there are two ways to achieve it: the first way is to bend the barrel. Mythbusters, an American Discovery Channel program, tried to Bai Wan the barrel of a bolted rifle to 180 degrees, and found that the bullet from that barrel still had the effect of penetrating ballistic gel and smashing it out of bulletproof glass. In the 1940s, both the United States and the Soviet Union tried to bend the barrel, allowing guns to be fired in narrow places. According to the test, German Krummlauf device can even kill enemy soldiers effectively at a distance of 100 meters.

Krummlauf I (infantry type) device is equipped with a 45-degree bending barrel with a periscope principle sight on it.

Krum Ralph P (armored type) displayed in koblenz Weapons Technology Teaching Exhibition Hall is equipped with a 90-degree bent barrel.

M3 "Gade" submachine gun bending cylinder assembly developed by OSS in the United States.

1945, the Soviet union also trial-produced the curved barrel Bosha -4 1 submachine gun, and the Soviet union even tested the curved barrel AK after World War II.

AKS-47III has an extended barrel bent 90 degrees.

But there is a problem with these weapons. The barrel life is too short. For example, Krummlauf, I only played 300 rounds and died.

The second method, guided bullet, changes the bullet from spin stability to fixed wing stability, and differentiates the bullet through the differential of the moving wing. It sounds impossible, but the fact is that Sandia National Laboratory of Lockheed Martin Company of the United States has developed 12.7*99mm NATO-guided bullets for the "EXACTO" project of DARPA of the United States.

EXACTO bullet panorama

The light trace of LED lamp at the tail of EXACTO bullet experiment under time-lapse photography

According to the Russian Tass news agency, in the summer of 20 16, the Russian Central Precision Manufacturing Company also produced guided bullets with a range of 10 km.