Chengdu next gen combat aircraft (?J-36) thread

styx

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Man the psychological impact CHAD had on Americans might be even greater than imagined if they're debasing themselves this much to cope.
the aviationist is italian as i am. His name i David cenciotti, (called "il cencio" from friends) he's a great fan of balenciaga shoes, bizarre Haircuts and dressing.

David_Cenciotti.jpg
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_killuminati_

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Indeed, western MSM has already previewed the most likely American responses to the CHAD. The first is to ostrich-up and double down on claiming the B21 is their 6th gen. In which case they will likely retrofit the B21 with radars, IRST and other fighter sub systems
I don't think it is possible to simply retrofit the B-21 with a fire-control radar for aerial engagements without major structual alterations (pretty much redesigning the entire front end and reevaluating it's stealth profile). Unlike the J-36 which has a prominent nosecone that can hold a radar, the Raider's nose is.. well, see for yourself,
B-21-in-flight.jpg
 

caohailiang

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You would pretty much have to refuel J36 with unmanned LO platform when operating that far out. That is actually one big question for such a platform. What will they use for it?

One suggestion from Xi Yazhou is to have refueling version of GJ11.
the obvious way is to reuse the j36 airframe, remove the cockpit/avionics/IWB, and turn it into a tanker - benefits include reusing maintenance infra as j36, reducing j36 design effort, large fuel capacity (maybe even close to 30ton), and probably cost less than half vs. j36
 
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phrozenflame

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the obvious way is to reuse the j36 airframe, remove the cockpit/avionics/IWB, and turn it into a tanker - benefits include reusing maintenance infra as j36, reducing j36 design effort, large fuel capacity (maybe even close to 30ton), and probably cost less than half vs. j36
Probably a clean-sheet stealthy dedicated refueling UAV would be better overall IMO instead of re-engineering J-36 into it.

Frankly, I'd be surprised if something already isnt in the works.

We will likely see alot of platforms and munitions pop up over the next few years that will make up the eco-system of the 6th gen PLAAF.
 

Ringsword

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At least for me I agree with the idea that we should not declare some sort of absolute victory until we see what the US makes.

Yes, from an objective level, there is an advantage in many sectors, but it is not impossible to leapfrog these with a latecomer advantage.

The enemy is less funded and arguably has systematic issues with worker/engineer skill (cough H1B cough), but we should assume that he is always hard at work and dangerous. Keep in mind Russia has the same issues as US but multiplied greatly yet they can in isolated cases make competent contemporary tech.

For the NGAD I'm adopting a wait and see attitude.
Just thinking -I don't think China would "telegraph their punch" so to speak about the J36/Shengad if it weren't already well past mere tech demonstrator and kick start the US NGAD where they can threaten /dominate our bad bluff(shades of Boxers demonstrating to Empress Cuxi with blanks that the evil Westerners and their rifles.modern weapons can be defeated.......the disgraceful outcome was infamous,painful.expensive in blood,treasure and reputation)This is NOT an accusation -just a smallest apprehension as this magnificent achievement of the J36 /Shengad has literally and figuratively been a "shot across the bow" to the west/world.And China should be very awrae/prepared for response-in all forms.Just thinking
 
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Jason_

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This is nice infographics. The thing is you dont seem to take into account that you're jamming from the sidelobe of the TPY-2. Which for 25000 TRM in average equals to about 1/25344 = 0.0004 or -44 dB This will work against your jamming power. Where the TPY-2 can burn through the jammer and still detect the target.

Even then the sidelobe can be further lowered down via use of appropriate weighting of the array e.g Taylor -40 dB Which can help lower the averages of the sidelobes to about -48 dB, with manufacturing quality of the antenna can allow at current industrial tolerance -50 dB, this sidelobe level also complicates engagement with Anti radiation missile and even electronic intelligence in the first place. It's the reason why every modern SAM's be it Western, Russians and Chinese are moving on phased array, even PESA can be made with such low sidelobes.

The more appropriate equation to use is this from David Adamy's "EW-101". This is for Standoff jamming case, which also apply here as you dont jam directly within the mainlobe. This allows you for directly calculates the Burn through range

View attachment 142610

Where :
PJ : Jammer power (dBm)
Pt : Transmit power (dBm)
Gj : Jammer Gain (dB)
2GTr : Radar antenna gain, 2x because antenna reciprocity theory (gain during receive = gain during transmit)
Grj : The radar sidelobe gain to the direction of the jammer this is the sidelobe gain
Dj : Distance between jammer and radar
Sigma : Target RCS (sqm)
J/S : Jammer to signal ratio which required for the jamming to "work" (bigger means worse, while smaller means better)

I also take liberty in recalculating some of the infographics.. for starter the THAAD
THAAD is known to have 25344 TRM's and 9.2 sqm antenna, also being Full FOV array, this put the frequency at 9072 MHz The basic average sidelobe level is that -44 dB but with Taylor -40 dB weighting it can be -48 dB with tradeoff of antenna efficiency which drops to 76%. Thus make the gain 47.8 dB instead of 51 dB.

TPY-2's power is sized based on ABM treaty which put limit on average power to 3 Million Watt/sqm Which correspond to about 1-10 Watt of average power/ Module, 20% duty cycle is assumed thus making the peak power of 1.267 MW. The range against the -20 dB target is then calculated to be about 210 km assuming Swerling case-1 target with 50% PD. 90% made it 126.2 km or basically Low Earth Orbit. This is without jamming



As for the jammer, assuming same working frequency. Your cheek AESA will have about 688 TRM's and unweighted (to maximize gain) 33.35 dB and 20KW power as specified.

Using the equation from EW-101 shows that the range reduction from the jamming is about 11%.

View attachment 142622


The TPY-2 can still detect that -20 dB target from 186 Km. Clearly brute force approach is not the way. Better attempt is to get Penetration aid.

The spreadsheet for the calculation is available here :
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This is very interesting and informative. I am aware of the decreased sidelobe effectiveness but I didn't know what a reasonable sidelobe gain would be for TPY-2 which is why I calculated the power density.

In David Adamy's equation, combining terms related to the jammer we have -Pj-Gj-Grj+20log(Dj)+J/S. Putting in the values I got a -4.84dB, 10^(-4.84/40)=0.756, so a 24.4% reduction in range? It seems that some the very low Grj plays a big part here.

Also, how does your calculated 210km range reconcile with THAAD's claimed detection range of many thousands of kms. Are the thousands of km range measured against >>0dbsm targets? My understanding of BMD radars is that they take advantage of the very low background noise level from objects in space to achieve their detection range. Would this make them more vulnerable to increased noise from jamming?
 

stoa1984

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antwerpery
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Thursday at 5:46 PM

The J36 will be at the center of China's combat web and will only be used in large scale conflicts. In a large scale conflict, it's gonna to be surrounded by hundreds of other aircraft and probably personally always be escorted by a squadron of drones. Kinda like a carrier strike group. Asking why it can't dogfight is like asking why an aircraft carrier doesn't have anti-submarine and anti-missile capabilities like a destroyer or frigate.

kurutoga
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Yesterday at 12:43 AM

US has the lead in low orbit constellation: Starlink

Stoa1984's Commentary

Again, if one uses the tea set analogy, it would be accurate to compare the J-36 stealth fighter to one of the many teacups while the core central asset would be the orbital DEW WMD array, made of a mix of dual-use civilian-military Starlink/Bluebird-type platform comprising Guowang/GW60 and more Proliferated Low Earth Orbit (pLEO) megaconstellations.

It would be utterly futile to discuss any future hypothetical conflict scenario while totally overlooking this most powerful asset.

And as a matter of fact, this orbital DEW WMD array would not only be able to prosecute a war but conclude it with a decisive victory within a few minutes after start. As long as the PLA doesn't fight the only other superpower, that is the U.S.

Indeed, what one needs to understand is that the first ~30'000 Guowang/GW60 satellites will be followed in the second and third phases by even more capable platforms.

Here the analogy with the documented U.S. space program:

media%2FGgX581LbkAAv1g_.jpg

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Phased arrays comparison of Globalstar Gen2, Iridium-NEXT, Starlink Gen 2, Bluebird Block 1 and Bluebird Block 2.

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• Globalstar Gen2: 1.4m x 1.4m Phased Array
• Iridium-NEXT: 2m x 2m Phased Array
• Starlink Gen 2: 2.7m x 2.3m Phased Array
• Bluebird Block 1: 8m x 8m Phased Array
• Bluebird Block 2: 15m x 15m Phased Array

This indicates that SpaceX will soon upgrade its fleet of 42'000 satellites to the next Starlink Gen 3 with 8m x 8m Phased Array antennas. And ultimately to the still undisclosed Starlink Gen 4 (?) with 15m x 15m Phased Array antennas although in a more limited numbers (60 Bluebird Block 2 announced by AST SpaceMobile so far).

The size of these Bluebird Block 2 with 15m x 15m Phased Array antennas will be comparable to the Cold War early warning radar PAVE PAWS (PAVE Phased Array Warning System). The peak transmitted power of PAVE PAWS were rated at 580 kW.

Add to this as the teapot, the future Chinese space solar power station (SSPS-OMEGA), able to steer MW level microwave beams on ground targets.

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