Which country's torpedoes were the most advanced in World War II?

Because Japan is an island country and attaches great importance to the navy, important materials can only be transported by sea, so Japanese torpedoes are the most advanced.

American military spending plummeted because of the conflict between the country and the war after World War I, and naturally it was no good. It is also because the torpedo made a joke: during World War II, Japanese merchant ships often had an unexploded torpedo inserted in their shells, just like a whale with a whaling fork, which made people shudder. This is the "secret weapon" developed by the US Naval Ordnance Bureau-MK14 torpedo.

Torpedoes can't sink an oil tanker.

In the first 18 months before the United States entered the war, the dud rate of MK 14 torpedoes equipped by naval submarines was as high as 70%. In this regard, American naval historians are in distress situation: "The most reliable performance of this thing is its unreliability!" Torpedoes that don't explode are not only easy to expose the position of submarines, but also often miss the enemy when they get cold feet, leaving enemy ships helpless to escape.

On July 24th, 1943, the submarine "Heizi" commanded by Captain L·R· Daspi received a password order to intercept Du Nan Maru III, one of the largest Japanese oil tankers. Captain Daspit was overjoyed: the Japanese island country regarded its merchant fleet as a treasure. The sinking of this "big fish" will break the hearts of the Japanese.

Soon, the black roe caught up with the target. That Japanese oil tanker has neither sea nor air escort nor tortuous route, and it is simply a target on the water. Captain Daspit restrained his ecstasy, quickly calculated the speed and orientation of the other side, commanded his submarine to occupy the launching position, and fired four torpedoes at Du Nan Maru at an almost vertical angle. But to the captain's disappointment, he didn't hear the sound of the torpedo explosion, nor did he see the Du Nan Pill tilting and sinking, but only observed several splashes on the side of the Japanese tanker!

The alert Japanese, like a frightened rabbit, made a big turn and accelerated to escape. Captain Daspit forgot to change the launching position and instinctively ordered the torpedo men to laser out two fish in the bow launching tube. This time, the trajectories of the two torpedoes were almost parallel to the target's route. They obliquely crashed into the stern of Du Nan Maru and exploded. "Du Nan Maru" lost its power and became a "dead ship" floating on the water. "Black Fish" can fire torpedoes at it at will.

According to the teaching model, Captain Daspit commanded the submarine to occupy the attack position accurately, and ensured that the re-launched torpedo could hit the Du Nan Maru hull at a vertical angle. "800 meters away, a torpedo is launched!" Torpedomen report loudly to the captain. At the same time, the sonar soldier reported that the torpedo trajectory was normal. Captain Daspi's eyes were fixed on the periscope, expecting the expected fire. However, there is no fire, only a splash that seems to have been seen, and it is a dud! Subsequently, the confused torpedo soldiers threw seven torpedoes into the water one after another. The captain only observed seven identical splashes from the periscope.

The problems of magnetic fuze and standby ignition device on German torpedoes are well known. The magnetic fuze was stopped in 1940 and put into use again in 1943, but an Italian aviation magnetic fuze torpedo was widely used throughout the war. TZ5 magnetic fuze on T-5 torpedo has the best performance in Germany. Its main component is a metal detector with two devices around it. An improved TZ6 fuze can be installed on any torpedo with a diameter of 21"(53.3 cm), but it was not used until the end of the war.