J-20... The New Generation Fighter III

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Quickie

Colonel
Despite of how cheap the J-20 will be, it would still be multiple times more expensive than the F22, comparatively speaking in relation to GDP and GNP. I have seen a post somewhere before, saying that even J-10 is more expensive than F22. This guy calculated the overall resources (not just natural resources alone, but a broader meaning) a nation has and how many hours of labour/work/effort per citizen to create enough resources to build the jet. According to his calculation, the F22 consumes less effort from the American workforce than does the J-10. This is very pragmatic approach to evaluate.
For example, a wealthy man with fortune in the tens of millions told a middle class blue-collar that BMWs are cheap, he should buy it, because Ferraris are too expensive for him. This wealthy man is half correct, because this blue-collar definitely could not afford the Ferrari. But the BMW is still too expensive for him. It is achievable, but the car loans would drain all his dispensable income. On the other hand, Ferraris are very expensive, but with this man's fortune, he could buy hundreds of them as if they were toys. Although expensive, they are cheap for this millionaire.

Get the moral of the story?

The moral of the story is, don't drive a Ferrari if the only way to pay for it, is through a loan which you would then pass on to your children for them to worry about and at the risk of further downgrading their credit rating.
 

delft

Brigadier
I still can't believe that the rear rudders (am I correct? the two big rear wings that slant to the side) can be moved to such large angles. The connecting joints look pretty small to me. How could it withstand the wind force when the jet is in supersonic flights. This would be like mounting a cardboard onto a formula one car like a ship's sails, it would be broken instantly.
The deflections of the rudders are calculated taking account of the forces that the parts and the whole can sustain. You don't want rudders so strong that deflecting them could destroy your aircraft. This is one of the advantages of fly-by-wire, or fly-by-light as the case may be.
 

delft

Brigadier
"Now being researched, fluidic injection nozzles divert thrust via fluid effects.[1] Tests show that air forced into a jet engine exhaust stream can deflect thrust up to 15 degrees. Such nozzles are desirable for their lower: mass and cost (up to 50% less), inertia (for faster, stronger control response), complexity (mechanically simpler, fewer or no moving parts or surfaces, less maintenance), and radar cross section for stealth. This will likely be used in many unmanned aerial vehicle (UAVs), and 6th generation fighter aircraft."

Via wiki. A lot of talk about this stuff going into 6th generation air frames.
Sounds great. But you have to design you engine to be able to tap enough air from the high pressure compressor to inject into the tail pipe. No doubt every designer of military aircraft engines is looking at it, but I think, not being competent to judge these matters, that it will not be easy.
 

paintgun

Senior Member
I remember one poster providing a link that a patent for a rectangular tvc nOzzle was issued by the t-50s engine suppliers-- and the Russians have experimented with rectangular nozzles too (that photo of a flanker with it's starboard nozzle converted). I consider the potential of a t-50 with stealthy nozzles to be a real possibility.
Of course, that probably will not massively change the dynamic between the big three, but it will nevertheless be a bit "meh" for us.

that flanker 2D nozzle is the crudest TV nozzle i've ever seen, not even a nozzle i think, just a cowling over the engine nozzle, otherwise there will be pressure loss in such nozzle

having said that, i think T-50 still have a fair chance of having a stealthy nozzle modification, despite the lack of such experimentation on their side, compared to the US, but nozzle aside they have to shield the engine first, if not nozzle treatment will be useless

i wont worry about 2D/rectangular/stealthy nozzle in J-20, let's leave CAC at that, we don't have the parameters

i'd prefer to see if it's underpowered or not
 

A.Man

Major
Reproduced Defense Commentary: China's first aircraft carrier platform, the mystery of the engine


Google Translation

Phoenix Military Defense Commentary August 15 August 14, China's first aircraft carrier platform successfully completed the first sea trials, this is a landmark event with. Chinese aircraft carrier platform trials successfully, that the aircraft carrier power plant basically been solved. However, China's first aircraft carrier to use what force platform, is still a huge mystery. "Kuznetsov" was bought by the Chinese before, there is the legend that the aircraft's power system has been dismantled together Western and Ukrainian. "Kuznetsov" was from the Ukraine towards the whole of China is relying on the tug, slowly sailed on the ten thousand sea miles to arrive at the destination, the level of hardship can be imagined. As the ship lacks its own power, the Turkish side had refused their order through the Black Sea straits. According to the original design, "Kuznetsov" was used in the four 50 000-horsepower steam turbines, to ensure that its speed can exceed 30 knots. Such power is also used for "modern" class destroyers, which uses two 50,000-horsepower steam turbine. That, "Kuznetsov" aircraft carrier power plant is the double of the "modern" class destroyers. If China imports such a large ship engines in the international events is not able to confidentiality, so you can rule out the possibility of re-imported from Ukraine. The Chinese-made ship with the original steam turbine, have not been able to reach this level, 051 series of destroyers equipped with the steam turbine are about 25000-36000 horsepower. Therefore, China's first aircraft carrier platform using the engine, if we adopt the domestic power system, can only be a new development. On the other hand, a huge volume of steam turbine, usually ships into the water before the installation is completed, replace the power system if you must re-enter a large dock for the "surgery." "Kuznetsov" was coming to China although the dock has been repaired, but moved in "major operation" signs. In addition, a separate waste vessel for the development of high-horsepower engine, does not seem reasonable. Therefore, there may be another historical truth! That is, "Kuznetsov" was the engine has been retained. Part of the memoir has pointed out, "Kuznetsov" was launched, the entire drive conventional steam turbines and has been placed inside. More images in accordance with the words, is already on the position of the engine, but no mounting screws. According to the follow-up memories, "Kuznetsov" was the power plant before the sale of China, met with Ukraine's "removal." But this "removal" was very subtle, in the end is all clean "demolition"? Or just remove some parts? As the huge volume of steam turbine, the so-called "complete removal of power system" is almost impossible, coupled with lack of funds and skilled workers at Ukraine, it may be just "cope with errands," like some parts removed, not even achieve the basic damage. Therefore, the "Kuznetsov" was restored power systems have adequate conditions. As the Chinese navy, "modern" class destroyers and the power system, "Kuznetsov" was a homologous series, which has a reliable repair at the reference object, if necessary, import or production of some of the equipment parts on their own, without having to import complete steam turbine. "Kuznetsov" was after so many years of restoration work, restoration of the number one focus is likely to focus on the power system. In fact, both China successfully developed its own self-healing, or that high-powered steam turbines in the technology sector are huge achievements. Although the steam turbine as advanced gas turbines, but for tens of thousands of tons of large ships, however, it solved the problem of power system availability, and for the continued development of China's large warships provided valuable technical accumulation. (Phoenix Military Defense Commentary Tao Mu sword)
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siegecrossbow

General
Staff member
Super Moderator
youtube videos for those of you too scared to go on Chinese websites:

[video=youtube;INGTSrGaYJw]http://www.youtube.com/watch?v=INGTSrGaYJw&feature=channel_video_title[/video]
 

Deino

Lieutenant General
Staff member
Super Moderator
Registered Member
Indeed some nice actions :p ... even if sadly a bit too short ! :(
 

siegecrossbow

General
Staff member
Super Moderator
Another one with the turning maneuver (more like a "roll-turn"):

[video=youtube;ENJFfYNNjaw]http://www.youtube.com/watch?v=ENJFfYNNjaw&feature=channel_video_title[/video]
 

kroko

Senior Member
It does not make sense for T50 to get the rectangle 2D nozzles.

The shape of the nozzle/rear body has a large impact over the drag. For example, F4's rear body is optimized for the J79 engines. When the Brits changed the engines to Spey, although Spey is more powerful than J79, it does not match the rear body design and thus the fighter performance dropped.

Traditional, a twin-engined fighter with close-coupled engines creates a lot of drag between the two engine bumps. This layout is perfect for rectangle nozzles because they eliminate the deep valleys between the engines. So, while the nozzle has a performance penalty, it has the benefit of lower drag.


This cannot be said about single engine fighter like F35 or far-coupled twin-engines fighter like T50. If they use rectangle nozzles, they will only have the performance penalties without benefit on the drag.


J20, on the other hand, could use the nozzles.

I dont know about the impact on performance, but i think that the fuselage would have to be redesigned to acommodate 2d nozzles

that flanker 2D nozzle is the crudest TV nozzle i've ever seen, not even a nozzle i think, just a cowling over the engine nozzle, otherwise there will be pressure loss in such nozzle

having said that, i think T-50 still have a fair chance of having a stealthy nozzle modification, despite the lack of such experimentation on their side, compared to the US, but nozzle aside they have to shield the engine first, if not nozzle treatment will be useless

i wont worry about 2D/rectangular/stealthy nozzle in J-20, let's leave CAC at that, we don't have the parameters

i'd prefer to see if it's underpowered or not

the flanker 2d nozzle was a soviet era program developed in 1990. The fact that russia since then has not followed up on this tech but went on to develop 3d nozzles tech, makes me doubt that they will adopt 2d nozzles for T-50. But i could be wrong. Who knows?

See post nº 276 for 3 pictures of this nozzle:

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Yeah. Real crude and heavy. Compare that with F-22 which flew for the first time that year:p...
 
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