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

sequ

Major
Registered Member
Either my math is way off, but has anyone else calculated the size of the Radar that can be fitted into the Radome? People have been guessing 3000 t/r modules, Based on the size of the nose, and using rough trm density of the AN/APG-81. It seems to be that just the nose array could have upwards of 5500+ modules. Can anyone else confirm?

Of course this is all rough speculation, I used my own possible isometric drawings to create a model.

AN/APG-81
R = 35cm = 3848.45 cm^2 1,600 T/RM's = 0.415 TRM/cm^2

??? Radar
R = 67.5cm = 14313.88 cm^2 x 0.415TRM/cm^2 = 5,950 TRMs
View attachment 142153View attachment 142154
It's too early for such precise calculations. We need more high quality images or even better, official specs.
 

vincent

Grumpy Old Man
Staff member
Moderator - World Affairs
There are plenty of other ways to deal with 2IC targets. J-36 plays an import role but war is about everyone working together.
- USMC camped on small islands can be neutralized with loitering munitions deployed from ships, USVs or UUVs without any PLA boot on island, any surviving infantry can play Cast Away until end of war.
Nah, just plant plenty of mines on those islands.
 

Gloire_bb

Captain
Registered Member
“Sum” of islands misses that hiding requires wide range for maneuver and a bunch of islands isolated from each other by water have much less contiguous area for maneuver. What makes finding targets in a wide area hard is that in a broad search space your probability of identifying the right starting points before the target moves is low. If the contiguous area is much smaller then repositioning opportunities and starting points in your search are more confined. The correct parameter here is positional uncertainty relative to search time of a space, not total sum of area.
It's both. Huge landmass with difficult landscape of all kinds, plus endless islands with countless marine traffic.

For example, JSM is 500kg class weapon; prsm is even lighter. Realistically, any small fishing craft or good SUV can carry them, like it happens in Ukraine - or in gulf(USMC inspiration).
Only boots can root out the problem, and it'll require a coordinated air/naval offensive away from inner reaches of mainland China a2ad to achieve.
This also isn’t 1940s Japan. And yes Australia would be a much more difficult nut to crack but if in a fight with the US the US is constrained to taking potshots from Australia China has basically all but won.
Yes, but the world and allies of December 1941 were also not 2030s bluefor.
Japan began from Taiwan, and had full initiative(which they abused to crushing degree), achieving key landings, full naval and air superiority within days.
Question of reinforcing McArthur per prewar plans disappeared before even being brought up(and Wake's fallen soon anyway), allied naval power(Pearl Harbor, force Z) was crushed before making any impact at all.

If, say, our model conflict begins from Taiwan, or is initiated by bluefor, there may be no initiative at all.

It was also...harder, but also easier for them, because anyone but Thailand and Portuguese colonies were enemies by default. No need to play complicated politics everywhere. Finally, there was main theater of operations to focus on; China limited available army resources, but otherwise didn't affect operations everywhere. Bluefor, to n the other hand, is a danger from many directions.

I assume that task is harder, especially since Japan had a clear goal(colonial empire). For China, it's much more complicated, redfor may need to conduct interdiction without occupations and preferably even neutrality breaches.

Which is why such plane as this is so important.
Extreme distribution of bluefor basing is it's strength, it has to be countered, and with appropriate use of intermediate and long range assets, it is a vulnerability that can and should be turned into key weakness.
PLAAF tacair more and more becomes a anvil(which is paramount). But the more PLA tacair grows towards parity with blefor(which is at least temporary superiority on theater), the more it needs a long rapier, as well as a long arm.
Given appropriate time, plan can move pla tacair forward. But it's time and fight yet to be won, penetrative means not reliant on a victory (which is yet to be won, and planning for victory by default is ... foolish) are a must.
 

Nx4eu

Junior Member
Registered Member
It's too early for such precise calculations. We need more high quality images or even better, official specs.
To early for such precise calculations? Yet I see dozens of people trying to guess how high and fast, and the flight characteristics of the aircraft from variable properties like wing sweep angle and Mach cones. There have been estimates for weapons bay depth, and payload configurations based on the small outline of a weapons bay. I think these sorts of discussions are fine. I simply did this to create discussion on the electronics potential of the aircraft, from the given photos and videos we’ve seen of the thing. Simply put, it has the potential to carry extremely powerful electronics, given the information we’ve seen.
 

Blitzo

Lieutenant General
Staff member
Super Moderator
Registered Member
Is there room for side arrays in this arrangement?

I have not included possible side arrays, this is just assuming the radar in the Radome is like current fighters, a single forward facing circular AESA type.


IMO we don't yet know what the geometry and positioning of the nose radome bulkhead will be, so it's hard to estimate how big of a radar it can accommodate.


Part 2 of my infographics series on how I expect the PLAAF will use the J-36. PLAAF CCA will be included after their public flight test. Please check out part 0 and part 1 as well. Feel free to share.

This time I describe how I think the J-36 can be used in defensive counter air to defeat large well-supported numerically superior hostile strike groups.

View attachment 142150

I think these are great graphics (particularly the symbology quality), but I do think if any conops of J-36 is depicted without the significant presence of friendly UCAVs/CCAs, then it is asking the J-36 to fight with both arms tied behind its back, hopping on one leg --- of course, even with that, J-36 will still hold significant and generation defining advantages over prior generation aircraft and still very much be capable of conducting the missions you're depicting, but it will do so with even less advantages than it is likely designed for.

The way that Yankee et al have spoken of J-36 and its importance in commanding and enabling unmanned assets, and the inherent role of UCAVs/CCAs in providing the full extent of J-36's capability may be not dissimilar to how integral PL-15s are to providing the full extent of J-20's capability (okay perhaps not that extreme, but close).

The caveat of leaving out UCAVs/CCAs because they have yet to fly is understandable, but I also think representative stand-in estimates can be made, especially as it is likely that there will probably be multiple tiers of UCAVs and CCAs in the future as well, all complementing each other.


Part of the reason I point this out, is because I think these images you've made are very good quality, but if they are shared widely without full acknowledgement of the intrinsic nature of UCAVs/CCAs in J-36's conops then other observers and pundits will just assume it's a traditional A2A interceptor or fighter, rather than seeing that it's more of a high end command and enabling asset for unmanned platforms as well. Even if they're left out as in your image here, it's probably worth highlighting that J-36s fighting in a conops without unmanned platforms is one which is fighting with a very significant handicap.

E.g.: I think a more "representative" image showing J-36 in a more system of systems approach would have similar formations and quantities of friendly CCAs operating ahead of the J-36s and J-20s to face the opfor's system of systems as well (such an image would look rather messy but that is also thematically appropriate given how modern air war is trending towards)
 

bsdnf

Junior Member
Registered Member
To early for such precise calculations? Yet I see dozens of people trying to guess how high and fast, and the flight characteristics of the aircraft from variable properties like wing sweep angle and Mach cones. There have been estimates for weapons bay depth, and payload configurations based on the small outline of a weapons bay. I think these sorts of discussions are fine. I simply did this to create discussion on the electronics potential of the aircraft, from the given photos and videos we’ve seen of the thing. Simply put, it has the potential to carry extremely powerful electronics, given the information we’ve seen.
According to the paper by Yang Wei and other CAC designers, it is not have the potential to carry extremely powerful electronics, but must carry extremely powerful electronics, to the point that even more important than how big the weapons bay or how fast it fly. So yes, it is important to discuss its radar and electronic warfare equipment, even if it is just a general statement without similar equipment models as a reference
 

Gloire_bb

Captain
Registered Member
How I expect the J-XXX will be used, part 1. Yes, I am aware that the PLAAF will also have CCAs. Not included because the star of the show is the J-XXX and because I don't know what it looks like and how it fits the PLAAF's current doctrine. #stopamericanscopingJ-XXXisabombernotatruesixgen
View attachment 142002
If you don't mind some critique.

Given j-36 side sensors, aspect LO, big missiles and likely self defense capability, as well as general undesirability of closer combat, i'd consider adding more high off bore engagements.
Furthermore, additional emphasis on killing blue rear offensively.

Also, for def-ca, I'd suggest adding in SAM envelope and redfor CCA formations. Just for completeness of picture.

Excellent graphics.
 
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Nx4eu

Junior Member
Registered Member
IMO we don't yet know what the geometry and positioning of the nose radome bulkhead will be, so it's hard to estimate how big of a radar it can accommodate.




I think these are great graphics (particularly the symbology quality), but I do think if any conops of J-36 is depicted without the significant presence of friendly UCAVs/CCAs, then it is asking the J-36 to fight with both arms tied behind its back, hopping on one leg --- of course, even with that, J-36 will still hold significant and generation defining advantages over prior generation aircraft and still very much be capable of conducting the missions you're depicting, but it will do so with even less advantages than it is likely designed for.

The way that Yankee et al have spoken of J-36 and its importance in commanding and enabling unmanned assets, and the inherent role of UCAVs/CCAs in providing the full extent of J-36's capability may be not dissimilar to how integral PL-15s are to providing the full extent of J-20's capability (okay perhaps not that extreme, but close).

The caveat of leaving out UCAVs/CCAs because they have yet to fly is understandable, but I also think representative stand-in estimates can be made, especially as it is likely that there will probably be multiple tiers of UCAVs and CCAs in the future as well, all complementing each other.


Part of the reason I point this out, is because I think these images you've made are very good quality, but if they are shared widely without full acknowledgement of the intrinsic nature of UCAVs/CCAs in J-36's conops then other observers and pundits will just assume it's a traditional A2A interceptor or fighter, rather than seeing that it's more of a high end command and enabling asset for unmanned platforms as well. Even if they're left out as in your image here, it's probably worth highlighting that J-36s fighting in a conops without unmanned platforms is one which is fighting with a very significant handicap.
You are right, my estimates are very dubious at best. But we have many generous angles of the J-36, some which include what appears to be the outline of the radome. Being blended in with the chine, we have some pretty good estimates of the chine angle, and overall shape of the aircraft itself. Of course like you said we lack accurate geometry and positioning, However it should be said that if the J-36 was indeed side-by-side seating, the nose should be much wider than that of the su-34.

Guessing the rough estimate of modules was a bit foolhardy on my part, but I strongly do believe the potential of the radar to surpass 4000, and even 5000 modules. That's just my 2 cents here.
 

sequ

Major
Registered Member
Guessing the rough estimate of modules was a bit foolhardy on my part, but I strongly do believe the potential of the radar to surpass 4000, and even 5000 modules. That's just my 2 cents here.
If it uses tile architecture they could fit 4000 modules in just 1m2 or 5000 modules in 1.25m2. The Turks managed to get down to 2.5cm2 for every TRM in their F-16 AESA: Turkey Military News, Reports, Data, etc.
 

Blitzo

Lieutenant General
Staff member
Super Moderator
Registered Member
You are right, my estimates are very dubious at best. But we have many generous angles of the J-36, some which include what appears to be the outline of the radome. Being blended in with the chine, we have some pretty good estimates of the chine angle, and overall shape of the aircraft itself. Of course like you said we lack accurate geometry and positioning, However it should be said that if the J-36 was indeed side-by-side seating, the nose should be much wider than that of the su-34.

Guessing the rough estimate of modules was a bit foolhardy on my part, but I strongly do believe the potential of the radar to surpass 4000, and even 5000 modules. That's just my 2 cents here.

I do expect J-36 will probably have quite a large primary radar just based on the size of the aircraft and its nose cross section.

The specifics of it OTOH, are probably not able to be adequately estimated yet for the reasons you and I listed.
 
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