Bright Sword Military System

It is very difficult for a howitzer to hit a moving target in actual combat.

There are many reasons for this. For example, howitzers are usually outside visual range and require artillery observers to provide coordinates, and the coordinates provided by artillery observers are often not so accurate.

For another example, the time required for communication plus the time required for distance difference will cause the artillery shell to be delayed, that is, lagging.

Take the Japanese Meiji Type 38 75MM field gun as an example. Its range is 8 kilometers, which fully meets the requirements for striking outside the gunboat range.

The muzzle velocity of the projectile when launching the grenade is 510 meters per second.

510 meters per second, 6 kilometers takes 12 seconds.

And this is still a straight line distance. The launch trajectory of the grenade is a parabola, which is twice the straight line distance, so it will take 24 seconds.

Coupled with communications from artillery observers and artillery maneuvers...

That is to say, it takes at least 30 seconds from the time the artillery observer reports the coordinates to the time the artillery shell hits the coordinates.

The speed of the gunboat is 11 knots, which is 20 kilometers per hour. In 30 seconds, it has sailed about 170 meters and escaped from its killing radius.

Therefore, if the Japanese artillery wants to blow up the gunboat, it must cover an area with a group of guns.

The Japs stationed in the Songhua River area have no artillery groups at all, and even the [-]nd Infantry Artillery is rare... What kind of infantry artillery should be equipped to deal with the guerrillas? It would be good to deploy a few mortars at the bridgehead.

Of course, this does not prevent the Japanese from deploying howitzers along the coast when the war begins.

But even so, the Eighth Route Army was able to suppress it with its air superiority.

More importantly, this kind of small gunboat will also play a great role in the Eighth Route Army's cross-river operations in the future.

Wang Xuexin pointed to the Songhua River on the map and said: "No matter how the war situation develops in the future, as long as our army wins the battle, we must cross the river! If warships cannot enter the Songhua River, our army will probably have to rely on the 'Wooden Dafa' to cross the river. !”

"Wooden Daifa" is the Japanese landing ship, and it is also a ship that the shipyard can produce.

Wang Xuexin continued: "But the 'Wooden Daihatsu' lacks firepower, and it will inevitably need gunboats to provide cover. That means gunboats are necessary both from the present and the future! Although it is very dangerous, it may become an enemy. The primary target of attack, but the key lies in how we use it!"

Su Xin no longer objected at this time, because she knew that as long as there was demand on the battlefield, the arsenal would have to produce, unless the arsenal could design a better solution.

As for danger...what equipment is not dangerous on the battlefield?
But Su Xin still has a problem.

"Captain!" Su Xin said: "The carrying capacity of the 25-ton inland river gunboat is limited. If we not only modify the 81MM mortar to a 107MM caliber, but also need a gun detection radar, and a radio station that can communicate with fighter planes... …”

Wang Xuexin replied without thinking: "Twenty gunboats, one team for every ten boats, and one gunboat from each team is not equipped with mortars, only machine guns for defensive equipment, and does not carry infantry. In this way, its load capacity is Is it enough to carry artillery detection radar and communication equipment?”

Su Xin set his sights on Su Liguo, and he had always been responsible for the artillery detection radar issues.Su Liguo nodded and replied: "The total weight of the artillery detection radar is about 500 kilograms, which is not much different from the weight of the 107 mortar plus artillery shells. It can definitely carry it. The problem is that there is a rotating antenna on the top of it. This will To make it very conspicuous on the battlefield, I'm worried that... it will become a priority target for the enemy!"

This is indeed a question. This is not a question of life and death or danger. It is not certain who is in danger on the battlefield.

The problem is that if you have a fleet of 20 gunboats, and two of them have rotating antennas, even a fool knows they are the focus.

Therefore, whether the Japanese coastal firepower is artillery or machine guns, they will immediately choose these two ships to attack.

The result is that these two ships will be damaged, disabled or even sunk immediately.

Even if it won't be sunk, the equipment on the ship, namely the artillery detection radar and communication equipment, will be damaged... These things are very fragile, and the gunboats have no armor. A few bullets and a few shrapnel can make them unable to attack. Work.

So the final result is that the gunboat is still fighting without gun detection radar and communication equipment.

Wang Xuexin thought about it for a while and said: "I can solve this problem in two ways. One is to install the main body of the artillery detection radar and communication equipment below the waterline!"

Su Xin nodded repeatedly.

Although the gunboat is not armored, it is equivalent to armored protection below the waterline: water has great resistance to bullets. A rifle's full-power bullet can only make a groove in the wooden board after flying about one meter in the water. Of course, it cannot Penetrate the gunboat.

On the other hand, if the gunboat is penetrated below the waterline, and the gunboat is probably going to sink, then do we still need to worry about whether the gun detection radar or communication equipment is damaged?
but……

"How to solve the antenna problem?" Su Liguo asked, this is the key point.

"Simple!" Wang Xuexin replied: "Just install an identical antenna on each gunboat, and then use an engine to drive it so it can rotate!"

The researchers at the meeting were all stunned when they heard Wang Xuexin's words, and then started laughing again after a while.

The solution is indeed very simple. All that is exposed is a rotating antenna. If everyone has this rotating antenna... can the devils tell which ship is the focus?
On the other hand, a dummy antenna plus a small engine used to drive it to rotate does not weigh much and does not take up much space. It can be placed directly on the top of the gunboat, which will not add any burden to other gunboats.

When Su Xin heard this solution, she couldn't help but glance at Wang Xuexin, secretly thinking that this weird elf is very clever... However, this little cleverness is very practical, and it solves a big problem at the minimum cost. No wonder it can be done Become the captain of the aviation group!
What Wang Xuexin was thinking about was that the importance of the shipyard was getting higher and higher: it could not only produce "wooden boats" for crossing the river, but also gunboats that provided firepower and landing capabilities... These things are in Songhua There is great potential for everyone on the river!
A shipyard like this must be protected.

Therefore, when Wang Xuexin heard that the Japanese fleet was heading towards China, his first reaction was to defend the shipyard. This place must not be bombed by the Japanese!
It is not enough for the coastal defense regiment to be here. Anti-ship missiles and "J-1" must also be arranged. In addition, mines must be laid outside the shipyard to prevent Japanese warships from approaching and directly bombarding them with naval artillery.

Who would have thought that none of these arrangements would be used. The enemy was not attacking the shipyard but Huludao, and it was a landing operation!

This made Wang Xuexin unable to react for a moment!

Hit Huludao?

Were you not taught enough lessons by the "J-2" before?