Set sail1992

Chapter 576
Seeing Zhang Qihang's gaze, Konstantin Antonov knew what he was thinking, and quickly explained: "Now we have started the design of the exterior parts, but the exterior parts are an important part of the aerodynamic components of the helicopter. part, so we need at least a low-velocity wind tunnel to assist us with this part of the work, so..."

"Need a blowing tunnel, right?" Before Konstantin Antonov finished speaking, Zhang Qihang, who had already understood what the other party meant, nodded happily: "No problem, leave the matter of the wind tunnel to me, and I will contact you .”

Although as a plant protection helicopter, the operating speed is [-] to [-] to [-] to [-] kilometers per hour, it doesn’t make much sense to blow holes at this speed, but in view of the need to develop a “coach type” version , this version of the helicopter still needs to emphasize the overall aerodynamic effect of the aircraft.

However, since the first user of the "trainer" helicopter is the Army Aviation Regiment of the Shungeng Military Region, it is easy to talk about the wind tunnel. The military region will come forward to coordinate, and Huateng Industrial Group will not pay the usage fee. Can you handle small things?

Konstantin Antonov breathed a sigh of relief: "Then I'm relieved."

After finishing speaking, he pointed to the helicopter in front of him and explained to Zhang Qihang: "Sir, according to your request, this helicopter uses the Austrian ROTAX 914 engine. Our main work is the fuselage, main reducer, auxiliary reducer and Design of the entire rotor system.

Compared with Robinson R22, the main reducer we designed is not only 7.2 kg lighter, but also has a higher transmission efficiency, reaching 97.65%;

In addition to the weight reduction of the main reducer, such as the structure of the rotor head, tail reducer, and fuselage, etc., we have also done a lot of structural optimization and weight reduction under the premise of cost control as you said. The final result is what you see now. Without the fuel tank, seats, instrumentation and cockpit, the weight of the whole machine is 235 kg, and the weight of these parts will not exceed 50 kg .So what is certain is that the empty weight of our helicopter will never exceed 280 kg! "(Reference basis: The empty weight of the H3 EasyFlayer ultra-light two-seater helicopter developed by Dynali Helicopter Company of Belgium is 285 kg)

Speaking of this, Konstantin Antonov's face was quite proud.

He is not proud that he has designed a helicopter with an empty weight of less than 300 kilograms, but is proud that he can build on the basis of the Robinson R22's empty weight of only 399 kilograms, but with the efforts of his team. , reducing the weight of a two-seater ultralight helicopter by nearly 120 kg!

Of course, there is a reason why the rotax 914 engine used in this helicopter designed by myself is 360 kg lighter than the Lycoming IO-51.5, but besides the engine, I can also reduce the weight of this helicopter by almost 68 kg , which really reflects the strength and heritage of the Soviet Union in helicopters.

张起航也被这个数字给镇住了：“空机重量不会超过280千克？我没记错的话，罗宾逊R22的空机重量是399千克吧？都是承载2个人，空重却从399千克降低到了280千克，这可不容易。”

Zhang Qihang was able to say this, which made Konstantin Antonov very pleased: the boss knows that it is not so simple to do all this.He nodded again and again and said: "Yes, it is really not easy, especially the only engine we can use is this ROTAX914, the maximum power is only 80 kilowatts, we must try our best to make this trip, but fortunately we finally succeeded. "

"Thank you." Zhang Qihang nodded again and again, and then asked curiously: "By the way, can you introduce some main data of this helicopter to me?"

"Of course no problem," Konstantin Antonov said: "But sir, before I introduce these parameters to you, I must make it clear to you that the data I told you are just our design data, whether in the end Achieving these data depends on the actual flight test results, and these data may actually be somewhat different.”

"I see."

Only then did Konstantin Antonov feel relieved, and said: "According to your request, we need to design two models, the plant protection type and the coach type. What you see now is the plant protection type, which focuses on large loads and Stability at low speed, the maximum take-off weight is 510 kg, the maximum flight speed can reach 80 km/h, and the volume of the medicine box is 120 liters;
The maximum take-off weight of the trainer is also 510 kg, but we have re-adjusted and optimized the reduction ratio of the main and auxiliary reducers and the shape of the rotor to make it have better response speed and sensitivity, and the flight speed is also faster. The fast flight speed can reach 165 kilometers per hour, and the cruising speed can also reach 155 kilometers per hour. "

Zhang Qihang nodded repeatedly, but when he heard the last two data, he couldn't help feeling a little regretful: "The maximum flight speed is only 165 kilometers per hour? It's a pity."

The maximum flight speed of Robinson R22 can reach 189 kilometers per hour, and the cruising speed can also reach 177 kilometers per hour.

Konstantin Antonov certainly knew what Zhang Qihang was regretting. He was a little helpless: "This speed is indeed a bit slow, but there is no way. The maximum power of this engine is only 80 kilowatts. If you are willing to replace it with a Robinson R22 With that Lycoming engine up there, I guarantee you can design a faster helicopter than the Yankee Robinson R22."

"Cough cough..."

Speaking of this, Zhang Qihang felt a little embarrassed, and he changed the subject abruptly: "By the way, how big is the fuel tank of this plane? I'm talking about the coach type."

Konstantin Antonov gave Zhang Qihang a lot of face, and did not continue to insist on the previous topic: "70 liters, according to our calculations, can fly for about 3 and a half hours in the solo flight mode.

In addition, when we read the Robinson R22 manual, we found that the Robinson R22 can be equipped with an auxiliary fuel tank. If it is a single person and an auxiliary fuel tank is installed, it will form a "transition mode" similar to a military aircraft, which can roughly carry 140 liters of fuel. Continuous flight of 1000 kilometers, of course, this is a very theoretical and limit data. "

Konstantin Antonov seemed to have some regrets, but Zhang Qihang didn't feel any regrets at all. He widened his eyes and was a little excited: "That is to say, with the auxiliary fuel tank, the theoretical maximum range can reach 1000 kilometers? Robinson R22 can’t do such a long flight distance, well, when this aircraft is officially launched for sale in the future, this will be an excellent promotional selling point!”

Konstantin Antonov felt that this is actually a purely theoretical data, but this purely theoretical data is completely different in the eyes of Zhang Qihang!
Think about it, a helicopter with a maximum flight range of more than 1000 kilometers, and it is also an ultra-light helicopter with a maximum take-off weight of only 510 kilograms. Let alone wanting to achieve such a flight distance, the pilot’s physical fitness, weight, and weather conditions And so on, how strict requirements are put forward by all aspects, but at least in theory, this is completely achievable, right?

Since it can be done in theory, there is nothing to say, our aircraft is awesome!

As a latecomer by his ancestral home, Zhang Qihang is too aware of how beneficial it would be to promote his own products if his helicopter can be such a promotional selling point. As for how far the flight range of the plane will drop after two people are seated... Cough cough, Does this question matter?Is it important?Anyway, our aircraft can fly more than 1000 kilometers in the extended range mode with a single person and an auxiliary fuel tank!

Thinking of this, Zhang Qihang looked at the pile of metal bumps in front of him and felt pleasing to the eye. He asked Konstantin Antonov: "Konstantin, what are we going to do next?"

"It's an idle test on the ground." After finishing speaking, Konstantin Antonov explained: "It is to keep the engine at a low speed, and at the same time connect the main reducer, let the rotor head rotate slowly, and see the relationship between the various systems. coordination between

After a pause, Konstantin Antonov explained again: "This is why we didn't install the main rotor and tail rotor, because the rotor rotates very slowly, so it is not so necessary."

"Understood, let's start."

Hearing what Konstantin Antonov said, Zhang Qihang couldn't wait.

………………

Although there is no instrument installed, there are a lot of wires from the helicopter connected to the test and detection equipment on the side, and the staff next to it are also waiting for it. After carefully checking that all the connections are correct, he finally made a gesture of "everything is OK" to Konstantin Antonov.

Konstantin Antonov, who was standing next to the console, turned sideways and made a "please" gesture to Zhang Qihang: "Sir, this is the first official ignition of our Huateng Industrial Group's first aircraft." , is of great significance! So, it’s up to you.”

Zhang Qihang was not polite to Konstantin Antonov.

In his opinion, there is no one who is more qualified than himself to start the key. He was not polite at the moment, and he was not humble. Instead, he nodded, took a deep breath, and pressed the engine start button—not to mention, At this moment, Zhang Qihang really had a sense of ritual in his heart.

Accompanied by the sound of the starter motor running, the ROTAX914 horizontally opposed four-cylinder engine roared briskly. After the engine had been running for a while, Konstantin Antonov connected the power to the final drive. The next moment, with the engine There was a low sound of running at the beginning, and the rotor head began to rotate slowly...

Seeing the slowly rotating rotor head, Zhang Qihang clenched his fists: success!
(End of this chapter)