Chapter 151 Yun-8's wings are frozen, a big problem
In 1996, our country spent a huge sum of US$66 million to purchase 8 sets of SouShui-2000MS radars from the United Kingdom, and planned to install them on Yun-8 The platform is used by naval aviation to search for surface targets and guide the JH-7 to launch anti-ship missiles for attack.
In the end, a total of 4 Y-8J maritime surveillance aircraft were produced.
These four aircraft were also the only space-based long-range detection force in our country at the turn of the century.
The performance... can only be said to be unsatisfactory.
But at least the problem of whether or not it has been solved, and this kind of aircraft also has certain command capabilities, has allowed our army to accumulate a lot of experience in the tactical arrangement and use guarantee of real early warning aircraft in advance.
Because the radar purchased from the UK has not yet arrived, the Y-8Y in front of Chang Haonan is actually just a platform model waiting to be modified. The main task at this stage is to operate in various environments Conduct test flights to obtain sufficient flight data.
At this time, the aircraft parked in the hangar had already suffered obvious damage. The improved nose radome and nose landing gear were almost out of shape due to the impact during landing. .
Fortunately, the cockpit and wing parts are relatively intact, so the crew members only suffered some injuries, and there is still the possibility of subsequent repairs.
Many staff from Factory 182 are already inspecting the aircraft here.
Seeing Du Yishan and Chang Haonan walking into the hangar, a burly middle-aged man walked up and said in Mandarin with a slight Hunan accent:
"Academician Du, we have followed your analysis , restored and simulated the flight data during the landing process, and found that it is completely consistent with the actual situation."
"In addition, a Y-8F has just been temporarily transferred from the assembly workshop and can be used. To cooperate with you in the experiment, the An-12 surveying and imitation data and the design drawings of several subsequent improvements have been prepared. Everyone in our 182 factory from me down, no, from General Manager Wang down, is at your disposal!"
Originally, Chang Haonan had no impression of the person in front of him, but he immediately reacted after hearing his accent.
This is the chief designer of a series of future improved models of the Y8 platform, Liang Shaoxiu.
Since Chief Engineer Xu Peilin, who was originally responsible for the Yun-8 prototype to Yun-8C, retired last year, the 182 Factory, which has relatively weak technical strength, can only take the lead at this time.
Just when I was at my most desperate, I encountered such a fatal accident.
“At my age, I’m almost the same as your General Master Xu. I can analyze problems, but I can’t keep up with young people in other aspects.”
Du Yishan waved his hand and signaled to the other party. He looked at Chang Haonan beside him:
"This is my student, Chang Haonan. I think the main work of this improvement should be completed by him."
"This..."
Liang Shaoxiu looked at Chang Haonan, who was younger than himself, and hesitated for a moment.
But soon he remembered that he seemed to have seen this name before:
"Oh...the one from the 606 Institute declared this year..."
J-8C The design has not yet been finalized, and after all, it is a confidential project and will not be promoted in a particularly public way. Therefore, Chang Haonan is now more famous as the first person to complete advanced technological achievements.
This kind of title has almost no influence outside, but it can be used as hard currency within the aviation system.
"Hello, Mr. Liang, I am very happy to cooperate with you and the comrades of Factory 182."
After the experience of the 83rd Project, Chang Haonan's [Management Ability] I have improved somewhat, and I have gradually become accustomed to dealing with similar scenes. I am no longer the little character in my previous life who was a little nervous even attending seminars.
"Hello, Comrade Chang Haonan, it's great to have Academician Du and your help, thank you."
"Now we are facing a very tight time pressure, luck is 8J Developed on the basis of the fully airtight Y-8C, the improvements do not involve the wing of the aircraft, so this accident is a big trouble for the entire Y-8 model.”
"We are about to deliver a batch of new models of Y-8F to Postal Aviation. If the hidden danger of icing on the wings cannot be properly solved, users may refuse to accept them. The export orders we are negotiating with Persia will also be affected. Impact."
"Well...I can't guarantee anything about time, but I will definitely provide the fastest efficiency." Chang Haonan nodded:
"How about we go first? Want to take a look at the design information? ""Okay, follow me."
Looking at Chang Haonan's confident look, Liang Shaoxiu, who was originally anxious, also calmed down a lot.
In fact, Chang Haonan knew the crux of the Y-8 wing icing problem.
It’s just that he has never come into contact with any information related to the Y-8 in this life, so it would be too inconsistent to directly affirm it...
To put it simply, it is the An-12/Yun-8 aircraft. The design of the de-icing system is not reasonable enough.
Take the horizontal stabilizer with the most serious ice problem as an example. It only has an electric heating de-icing system that is distributed on the entire horizontal tail surface and is evenly exposed to rain and dew. Moreover, this system only has one highest current mode available.
In the Soviet Union, considering the climate conditions near the Arctic Circle, this design is still barely usable. Anyway, the temperature is low enough, and the current is high.
Even so, the flight safety record of the An-10/An-12 is quite poor.
In China, where the temperature is relatively high, if the heating system is turned on for a long time before it freezes, it will cause the insulating glue layer to heat up rapidly and carbonize, further causing a short circuit and burning through the tail skin
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So the pilot must turn on the electric heating device after confirming that there is a risk of ice forming on the horizontal tail, or even when ice has already begun to form.
Even this will be risky.
Because the ice thickness is different in different parts of the wing, the heating power of the de-icing device is average.
It is very likely that the ice has not been removed in some places, and the insulation glue layer in some places has begun to be damaged.
Of course, there are some fierce people who can rely on their experience to prevent icing in advance by turning on the heating device for short periods of time several times, but this obviously should not be a requirement for ordinary pilots.
As for the main wing of the aircraft, as Du Yishan said before, due to the use of a more efficient air-thermal anti-icing system, there is really no need to worry about anti-icing capabilities.
But it is definitely not without problems.
Gas thermal de-icing requires extracting high-temperature and high-pressure gas from the engine combustion chamber as a heat source, which will inevitably affect the power of the aircraft.
Therefore, on the premise of meeting the de-icing capacity, the total amount of gas used should be reduced as much as possible to maintain engine performance.
However, the design of the Yun-8 system also highlights the idea that great efforts can produce miracles——
You must know that aircraft are most likely to encounter aircraft during takeoff, landing, and low-altitude and low-speed flight. Wings freeze.
The engine also needs to output enough power, or be prepared to output enough power.
At this time, if you pump out 10% of the high-temperature and high-pressure gas at a time to remove ice, how can the power be guaranteed?
Moreover, the environment of low-altitude and low-speed flight is inherently complex, and artificially adding a high-speed airflow blowing on the wing surface will only further increase instability.
All of this makes the already poor low-speed performance of Yun8 even worse.
“By the way, Commander Liang.”
After walking out of the hangar, Chang Haonan suddenly stopped Liang Shaoxiu in front of him:
“It would be best to have a meteorologist. Experts in the field will assist us, which will be much more efficient.”
Thank you brothers for your support. The best-selling selection will be posted tomorrow, with more updates!
(End of this chapter)