Now heavy tanks are also being developed, and large helicopters in the air are about to follow.

At the beginning of August, Duan Yunpeng began to design a new generation of medium and large transport aircraft, this time the tonnage has doubled compared with the Dragonfly helicopter, so it is necessary to have a turboshaft engine with higher power.

This time, Duan Yunpeng designed the Hippo helicopter, you can see how big it is from the name, yes, it is the same tonnage as the later Black Hawk helicopter and Miba Hippo helicopter, a ten-ton general helicopter.

You must know that this level of general-purpose helicopter, its application prospects are very extensive, after the installation of pylons, it can be transformed into an armed helicopter, and when carrying soldiers for delivery or special operations, it can carry more than a dozen fully armed soldiers at a time, landing hundreds of kilometers away.

This time Li Yunlong came again, and he was very interested in any kind of weapon designed by Duan Yunpeng.

Of course, there is Zhang Xia, she is also very concerned, a few people are together, Duan Yunpeng said confidently: "If our hippopotamus helicopter is equipped, it will be easier to fight little devils at that time." The most complicated thing is the high-power turboshaft engine, our hippo is equipped with two engines, each with an output of 1,100 kilowatts, that is, 1,500 horsepower, and the two add up to 3,000 horsepower! ”

Li Yunlong said in surprise: "This is too powerful, it is equivalent to two 1,600 horsepower turboprop engines!" ”

Duan Yunpeng said with a smile: "That's right, they are actually very versatile, and I am now using a 1,600-horsepower turboprop engine to improve the design of a 1,500-horsepower turboshaft engine to meet the power needs of our Hippo helicopter." The maximum take-off weight of the Hippopotamus helicopter is 11 tons, which is very powerful. ”

You must know that in the original plane, the world's first turboshaft engine, but it only appeared in the fifties, it is the one-stage centrifugal impeller compressor developed by Turbomeca, a single-rotor turboshaft engine with a two-stage turbine, with a power of 2,000 kilowatts.

Turboshaft engines are much more advanced than piston engines, and in the history of aviation, early helicopters still used aviation piston engines, but later with turboshaft engines, piston engines were eliminated.

Therefore, the turboshaft engine designed by Duan Yunpeng this time has a maximum output of 1,100 kilowatts and a power-to-weight ratio of ten, while the general aviation piston engine can only reach about six, which is a big gap.

The design of the Hippo helicopter is also based on the Black Hawk helicopter, so its performance is naturally needless to say, very advanced.

The blades of the Hippo helicopter have been increased to five, which is to meet the greater take-off weight, and each blade is a product of high technical difficulty.

Because the design of the blades is directly related to the flight performance of the helicopter, as well as the noise level of vibration.

When the helicopter is flying forward, due to the greater the speed of the helicopter rotor tip, the more likely it is to produce shock wave resistance at the tip of the propeller, and the appearance of wave resistance will sharply increase the power required by the helicopter.

So if you have a higher number of blades, the tip speed will be lower, so there will be less noise and vibration, but this will increase some aerodynamic drag.

It can be said that in Duan Yunpeng's previous life, helicopters have always been China's shortcomings.

After buying more than 20 Black Hawk helicopters from the United States in the 80s, the military considered them to be the best utility helicopters in the world, and in fact it was.

The performance of the Black Hawk helicopter is very good, more advanced than the Miba hippopotamus, and it can easily take off and land on the plateau.

Moreover, the Black Hawk helicopter is very fast, with a maximum flight speed of nearly 360 kilometers per hour, mainly thanks to the advanced turboshaft engine and aerodynamic design.

Although these works are said to be very busy, through the efforts of several factories, a lot of advanced aircraft, tanks, and artillery have been equipped in the Eighth Route Army, so now the Eighth Route Army is also constantly expanding its offensive to beat the little devils.

Today, Zhang Xia and her teammates are going to be dispatched again, the air force bomber group, there are more than a dozen long-range bombers, and now they have modified the equipment that can fight at night, which is a new type of radar, so when the time comes, they can use the radar to detect the enemy's targets, and then accurately drop bombs and bomb.

This time, the Eighth Route Army was preparing to dispatch long-range bombers to attack a Japanese military port in Fujian at night.

This operation was very dangerous, but everyone was not afraid, because they had confidence in the Kunpeng 1 long-range bomber.

This time was also a good opportunity to test the airborne radar, so Zhang Xia served as the captain of the bomber team.

If you bomb at night, you don't have to worry about the devil's interception.

According to the intelligence of the reconnaissance aircraft, in that military port, there were two Japanese battleships, two cruisers and five destroyers, which was a good opportunity.

At twelve o'clock in the evening, the bomber group took off, a total of ten, each bomber was loaded with three tons of bombs, so that it could easily fly back and forth, but also considered some situations, if there was an accident, it could also fly for half an hour, and it could also return to the clouds.

Zhang Xia sat in the cockpit of the first long-range bomber, directing the operation.

Now she is the best bomber pilot that Duan Yunpeng has cultivated.

So she knew that she couldn't lose Duan Yunpeng's face, and she didn't have to worry about safety when she dropped bombs at an altitude of 6,000 meters, because the anti-aircraft guns on the Japanese warships couldn't hit them at all.

Just two hours later, the long-range bomber group arrived in the sky above the military port, Zhang Xia personally pressed the button of the flare, and then the flare illuminated the entire military port, under the dual effect of radar and flare.

The bomber group began to drop bombs, and the 30-ton bombs were almost a thousand, so at this time, you could see that the Japanese military port was soon on fire and became a burning ocean

Those battleships, all of them were shot one after another, and they burned, and the Japanese began to extinguish the fire, although some anti-aircraft guns were firing, but it was useless.

After completing the mission, Zhang Xia led the bomber group back again.

The losses of the Japanese army this time were not small, many battleships were damaged, although it is said that they did not sink them, after all, their tonnage is placed, but if they are to be repaired, it will take more than a few months.

Most importantly, this prevented the combat operations of the Japanese army.

When the bomber group returned to the air force, Li Yunlong and Duan Yunpeng came up to greet everyone.

When he heard that the bombing effect was very good, Duan Yunpeng was finally relieved, he knew that Zhang Xia had become a very good bomber commander.

In the future, with the Kunpeng No. 2 long-range bomber, you can go to bomb the devil's bases on the mainland and on the islands.