"I think it's okay, Mr. Holger's own money is not spent as much as he wants?" Hearing Lin Hongfei say this, the prime minister also smiled, "But how to do it, Xiaolin, you always have to talk to Mr. Holger." ”

"Yes." Lin Hongfei nodded hurriedly, and then turned to the experts, "To design an aircraft, since it is necessary to use it on an aircraft carrier, it is necessary to first determine the size of the aircraft: it can't be put in the hangar, which is a big joke." Considering that the wings must be foldable in order to save space as much as possible for use on aircraft carriers, of course, we will discuss the question of whether the basic version of this helicopter we designed uses wings......"

But before Lin Hongfei's words were finished, he was hurriedly interrupted by Guo Jingshan, "Leaders, leaders, colleagues, Comrade Lin Hongfei, I'm sorry, I take the liberty to make a suggestion: my suggestion is that from the very beginning, we have developed two models on the basis of this aircraft: the ordinary type with the same shape as the EH101 and Mi-26 with the same shape as the traditional single-rotor helicopter and the special type with wings and vector thrust duct propellers, we can call it Type A and Type B, if the modular design scheme is adoptedAt least more than 90% of the components between Type A and Type B can be common, and each branch of the armed forces can choose Type A or Type B according to their different needs. ”

"Guo Jingshan's words at the same time make sense," the prime minister groaned for a while, nodded, wrote something on the paper, looked up and asked Lin Hongfei, "If you develop two models at the same time, you can achieve 90% of the parts and components?" ”

"This, I'm not an expert, I dare not say so sure......" Lin Hongfei hesitated. "But in my opinion, at least 80% of the parts should be common." ”

"Then it's so decided, at the same time to develop two models, a basic type, a wing and vector thrust ducted propeller." The Prime Minister immediately clapped the board, "You continue with the topic just now." ”

"Yes, when it comes to the size of the aircraft, my advice is to start the design. We can take into account the upgrade of the load in the future, and try to design a large enough cabin for the aircraft, which can only carry 10 tons or even 8 tons or 6 tons now, but when our engines can keep up in the future, we can easily increase the load capacity to 13 tons or even 15 tons without making any changes to the cargo hold...... Personally, I think a maximum load of 15 tons is fine. Of course, if everyone thinks that the 20 tons of Mi-26 is more in line with the demand. Also considered. ”

This time. After Lin Hongfei's words were finished, there was more silence.

Lin Hongfei's words are of course very reasonable, at the beginning we determined a load ceiling, according to this upper limit to determine the size of the warehouse, now our level does not matter, you can load less. But in the future, when our engines go up, we will be able to immediately increase the load performance without any changes to the cargo hold, which is really tempting, but what needs to be determined now. What is the proper maximum payload of this aircraft? Although everyone also thinks that Lin Hongfei's 15 tons is very reasonable, if the military insists that 20 tons is more suitable, then it can only be 20 tons, in the final analysis, in the republic, at the beginning of the design of any kind of aircraft, the first thing is to meet the military's requirements for use, or this situation will change in the future, but so far, the situation is still like this.

"Whether the maximum load is 13 tons, 15 tons or 20 tons, this question is for the comrades of the army to consider, what is the specific situation, we also have to consider the economy and cost-effectiveness ratio, this can be discussed slowly, but it is always a good thing to have a large cabin, and there is a lot of room for modification and improvement in the future," at the critical moment, he opened his mouth today, and he could be regarded as making a decision for the little problem just now, "Now Comrade Xiaolin, you continue to speak." ”

"Yes," Lin Hongfei responded, "The next thing is the aerodynamic structure of the engine and the whole aircraft, we have a good reference object in this regard: the US Navy CH-53E 'Super Stallion' heavy helicopter, this helicopter uses three 10-minute emergency maximum power of 3270 kilowatts of the engine to achieve a maximum load capacity of 15 tons, with the current level of our country's aero engine industry, we have not been able to develop such a high-power turboshaft engine......

"Without such a powerful engine, wouldn't this plan become a castle in the air?" Lin Hongfei's words immediately made the Standing Committee of the Wan Bureau seize the opportunity, and he sneered and looked at Lin Hongfei, "Comrade Xiaolin, your plan seems to be a little inconsiderate." ”

"Yes, what the chief criticized was, "No matter how dismissive I am about the words of the Standing Committee of the Bureau of Wan in my heart, but since the other party is a member of the Standing Committee of the Bureau, this thing has criticized himself, whether this criticism is right or wrong, he must accept it honestly, there is no way, this is officialdom," I also considered this problem, so my idea is to divide the entire plan into three steps, and gradually achieve the goal of a maximum load of 13 tons to 15 tons. ”

"Three steps?" Sure enough, hearing Lin Hongfei say this, the faces of the current Prime Minister and the Prime Minister showed a look of interest: If this is the case, it is a bit interesting.

"Yes, it is divided into three steps, the first step, my initial idea is two power configuration schemes: three TV3-117TM and two D-136 two power combination forms for the maximum and minimum power system testing, on the basis of these two power to design the final drive and wing."

"According to today's wingless A scheme and wing B scheme, my preliminary calculation result is that because of the weight of the heavy helicopter itself, the use of three TV3-117TM engines can only carry a maximum of 2 tons, but it doesn't matter, this is not our power choice, our main test is the use of wing B scheme."

"Under scheme B, we can use a small forward sweep wing, which can provide more lift under the premise of the same wing area, our company is conducting computer simulations and tests on this swept wing technology, and now some results have been obtained, and a general scheme of a small forward sweep wing with a forward angle of 8 degrees and an area of 32 square meters has been obtained......"

"Forward-swept wings?" As soon as Lin Hongfei's words came to this, he was interrupted, "I remember that the forward sweep wing has a very serious problem of bending and twisting, and I don't know if Mr. Lin has taken this into account." ”

"Yes, it's true that the bending and torsional divergence problem is an inherent problem of the forward-swept wing," Lin Hongfei nodded, "but our calculation results are that the critical speed of the forward-swept wing with this 8-degree forward-swept wing is 720 kilometers per hour, and even if it is equipped with two D-136 turboshaft engines, the fastest speed of the aircraft is only 550 to 590 kilometers per hour, which is far from the speed at which the flexural divergence effect is excited." ”

"I don't have a problem, Mr. Lin, please continue." The expert who interrupted Lin Hongfei's words nodded with satisfaction.

"According to this plan, under the same wing area, the lift of this wing can provide 12% more lift than the straight wing, we can use this technique we use in plan B, the preliminary calculation result is that if there is a 180-meter-long running space, it can probably carry 2.8 tons of materials to take off," Lin Hongfei paused slightly, and added, "This forward-swept wing, I refer to the wing design scheme of the V-22 'Osprey' tiltrotor to a certain extent." ”

"The wings of the V-22?" Lin Hongfei's words immediately caused a low exclamation.

In the past two years, the Americans' V-22 "Osprey" tiltrotor has become very famous, and the reason why it is famous is naturally because of the unique take-off and flight methods of the V-22: it can take off and land like a helicopter, and it has the same flight speed as a fixed-wing aircraft, and these two take-off methods give the V-22 a high degree of tactical flexibility and the convenience of combat missions.

But while everyone notices this, few people notice that the Osprey's wings are actually a pair of forward-swept wings with a forward tilt angle of about 5 to 8 degrees. Lin Hongfei has not calculated how many degrees of forward sweep the forward swept wing, and can only calculate an approximate degree according to the existing drawings.

But this is actually not the most shocking, what shocked everyone the most was another data that Lin Hongfei said......

"Mr. Lin, are you sure that you can use three TV3-117TM to carry 2.8 tons and taxi 180 meters to take off?" Li Zaijian, the chief designer of the Changfei Zhi-8 helicopter, stood up and asked Lin Hongfei eagerly.

It's no wonder that Chief Designer Li is so nervous and eager, but this number is too important: the U.S. Navy E-2C carrier-based early warning aircraft has a load of about 4.5 tons, and this aircraft still needs to be ejected and taken off, if the aircraft designed by Lin Hongfei can take off with a load of 2.8 tons under the "weak" power of only three maximum emergency total power of only 6840 shaft horsepower, if it is replaced by two D-136 engines with a power of up to 11,400 horsepower, wouldn't it be able to carry more than 25 tons and take off?

It is important to know that according to several basic parameters of aviation design, as an aircraft with a load of 15 tons, the weight of the aircraft itself will exceed 10 tons, but the Mi-26 helicopter with two D-136 turboshaft engines can already achieve a vertical take-off with a load of 20 tons!

Taking a step back, even if we do not have the technology to obtain the manufacturing technology of the D-136 turboshaft engine from Ukraine, we can order a batch of mothballed first, and then use it exclusively for aircraft carrier-based AWACS aircraft.

"There may be some discrepancies, after all, it's just a preliminary plan, and I'm a second-in-class knife in aviation design," Lin Hongfei scratched his head embarrassedly and said, "But the discrepancy shouldn't be very big." (To be continued......)