After listening to Speer's explanation, Li Le nodded with satisfaction, he needed more tanks, even if the Soviet-German war was over, he still needed more tanks.

Of course, tanks are only one of the branches of his climb to the tech tree, but the important ones are planes and naval equipment.

After all, when it comes to army equipment, both the Americans and Japan, a potential Asian enemy, are still far behind Germany.

There are many M4 Sherman tanks in service in the United States, but their performance can only be regarded as "average". In this case, with the Leopard tank and the subsequent new tanks, the German Army is fully capable of competing with the American army.

If you add the elite tank crew, counting the combat experience, the US Army is inferior to the German Army, which may be a very considerable judgment.

As for Japan, the emperor's army, which relied on the bean chariot to bully countries without industry in Asia, is really not on the same level as the German army in terms of weapons and equipment performance.

Therefore, Li Le asked about another very important weapon: "So, how is the development of the radio proximity fuze?" ”

Developed by the United States during World War II, the radio proximity fuse was then regarded as an important secret weapon for the Allies, so it was initially avoided in the event that it could fall into enemy hands until 1944, when the restriction was lifted.

Of course, Li Le knows very well how important this weapon is to air defense operations.

The use of radio proximity fuses has greatly increased the effectiveness of the US Navy's anti-aircraft fire. According to post-war statistics, the main force of the US shipborne anti-aircraft artillery, the 127mm gun, takes an average of 500 shells per enemy aircraft to shoot down each enemy aircraft when using the radio proximity fuse; And with conventional shells it is four times more, that is, 2000 rounds.

Such a huge gap can definitely be regarded as a great invention to change the mode of warfare. Its appearance, one can even say that it perfected modern warfare.

Li Le knew that the main structure of the radio proximity fuze used in World War II was to use a cartridge case as an antenna.

He had long since begun to guide German radio specialists, setting their sights on such a fuse. A German radio fuse was also developed a month ago.

The German radio fuze is based on the same principle as the American one, which contains a vacuum tube radio wave transmitter that emits a radio of 180 to 220 MHz when energized.

When the projectile is close to the reflective object, part of the radio waves are reflected. As the distance between the shell and the target decreases, the Doppler effect causes the reflected radio waves to create a low-frequency signal of 200-800 Hz within the current of the transmitter.

The signal is filtered and amplified, and detonated when the signal strength exceeds a certain limit.

The only difficulty was that the entire device was very sophisticated, and it needed to withstand the acceleration of more than 20,000 times the Earth's gravity when firing from the gun, and the spin of 500 revolutions per second, and it had to be small enough to fit in the warhead of the shell.

When it comes to precision machining and technical strength, German workers are no worse than American workers. The two sides can be said to be evenly divided, and there are even many aspects in which the German workers are in absolute lead.

So, while the Americans tried to develop a radio proximity fuse, the Germans also tried to study it accordingly.

And, after having enough theoretical support, Germany was the first to develop this radio proximity fuse.

"My Führer, this fuse has been developed, and engineers are trying to figure out how to reduce the size of this fuse." Speer replied.

As he spoke, he drew an approximate volume: "Now it can be mounted on shells used by the ship's 128 mm caliber anti-aircraft guns......

Truth be told, this was already the result of the German engineers trying their best to shrink down. You must know that in World War II, only 127 mm caliber anti-aircraft guns in the United States could use radio proximity fuses - the technical level of both sides is about the same.

This weapon is very suitable for combat at sea, because the shells fired by the naval anti-aircraft artillery, even if they fail, will fall into the sea and cannot be salvaged by the enemy to imitate.

In the real historical time and space, most of the air defense operations against Japanese kamikaze attacks at the end of the war were fruitful because of the use of radio proximity fuses.

U.S. Secretary of the Navy Forresta also praised the use of radio proximity fuses, which enabled the United States to greatly reduce casualties in personnel and equipment in the Pacific theater.

Similarly, in real historical time and space, radio proximity fuses on the European battlefield also helped Britain successfully block the German V-1 rocket offensive in 1944.

Most of the downed V-1 rocket anti-aircraft artillery was equipped with two new inventions: fire control radar and radio proximity fuse. According to post-war statistics, it took an average of 150 shells to shoot down a V-1 with a radio proximity fuse, but about 2,800 rounds with conventional shells.

"This is just an attempt, and we want to use this fuse on a large scale in warfare, so that our soldiers can win bigger victories with fewer casualties." Li Le said to Speer.

Speer nodded, and said to Li Le: "My Führer, the engineer has discovered the characteristics of this fuse - it can be used on bombs, and it can also be used on howitzer shells for ground attack...... It's simply omnipotent, it's incredible. ”

Radio proximity fuses offer another viability, which is to have artillery shells explode at a certain distance from certain targets — they are infinitely more sensitive than fuzes that rely on air pressure to determine altitude.

Therefore, it is possible to make the shell explode at a certain height above the ground.

In reality, radio proximity fuses are also used in ground-based artillery, as well as on explosive lights and rockets. When a radio proximity fuse is used for ground fire, the shell will automatically explode at an altitude of 10 to 70 feet above the ground.

The debris and pressure can kill and injure unarmored personnel on the ground, even in makeshift bunkers such as foxholes.

In the real history of World War II, at the end of 1944, the German army attacked the Allies in the Battle of the Bulge. U.S. artillery used radio proximity fuses for the first time in bad weather on December 8, and the unsuspecting Germans suffered heavy losses.

The Germans also had another new weapon that could use a radio proximity fuse: napalm! If this weapon explodes at a certain height, the burning effect will be better and the coverage area will be larger......

Incendiary items are scattered on all nearby targets and cannot be extinguished for a short period of time. The air in the blast area will be depleted in an instant, and the entire area will be turned into hell!