Why is lateral stability better? Which airliner has “bended wing tips” for stability reasons? The (quite simple) physics behind roll stability are similar for high-wing and low-wing, just that the different location of the center of gravity requires a switch in sign.

You need to check some Boeing 737s lately. The one I just flew in recently had blended/bended wingtips, pretty long and upward too, I might say.

I think the plane is flying one of the original WS-10 (not WS-10A) that has a weaker power rating and longer spooling time than the AL-31F.

It seems to me this is an old picture. The White 01 has been retired and sitting somewhere in CFTC in dilapidated condition. 03 may have had a similar fate sometime already. White 03 here still has the old style of flimsy “rods” attached to the intake, not like the thicker, more aerodynamically shaped rods that you see in all the newer aircraft.

You said the magic word. It is a good placeholder. Same is the reason of the new J-7Gs in the PLAAF.

ACM is a perishable skill. You cannot let that perish with the retirement of old planes. Until something comes better along, these planes are good for maintaining ACM training.

If war truly comes along, they will handle third world style fighter aircraft handily, usually other J-7s, MiG-21s, Mirage IIIs, various F-5s, MiG-23s, various attack jets like Jaguars, MiG-27s, and A-5s, older F-16s, MiG-29s and Mirage 2000s. Third world aerial warfare conditions are not like first world type air wars. Think of the anime series Area 88. That’s not really too far off.

Though lacking range, the slotted array radar has great FOV, and that really helps the plane in BFM.

Flogger, I must admit, your example of the Mitsubishi F-2 is certainly and interesting one. It does seem possible that way.

The F-2 still sources from the US, especially the engine and certain airframe components.

Remember, one of the points about the F-2 issue to Japan’s trade imbalance with the US, and the US still wants Japan to import as much high tech components from the US.

The whole idea of the J-11B stems from the original J-7 experience. Relations between China and the Soviet Union deteriorated, and not all the information for the MiG-21 license was received, at least for the Chinese satisfaction. Unlike the J-6 which they were able to built completely from Russian blueprints, the Fishbed blueprints were not complete. China had to develop and fill in the part of the design. And due to the break, China had to completely reverse engineer J-6 and J-7 components that otherwise would have been imported from Russia so that these components could now be built in China. China wants to be completely self sufficient in the production of a fighter, regardless of the origin of that design. That means everything in that fighter to the last nut and screw, can be sourced within China. This is part of Chinese belief that they need to be self sufficient and their phobic distrust of the ‘outside’ world. For that matter, they still greatly mistrust the Russians as much as the Russians distrust the Chinese.

Every weapons system has to be ultimately self sufficient and produced indigenously in China. That is always the perennial PLA doctrine, for all branches, including ships and tanks. Everything that is imported is regarded as a short term fix, and importation is never the long term goal.

If you claim you truly want to understand PLA, this is one of their most important and basic tenets that frames all their actions and technological development.

You are wrong
i am not speculating, if i do find a russian sources such as TASS or Rosoboronexport addmiting China now is building real indiginisized Su-27SKs that are not covered by the original contract i will addmit i was wrong however what i am just listening are conspiracy theories and speculations that prove nothing, of people who speculate and late turn specualtions facts.

Russian sources sooner or later will report about the J-11B and sooner or later will report if China has opened again the line of Su-27s without kits supplied by Sukhoi and Russia, however while i do not see that i hardly will believe those rumours you want to believe of Russia has been again screwed by China.

You are the one speculating. It is a FACT that China is building an Su-27 variant with a heavily modified airframe, with an all new engine, radar, avionics and hardly a Russian part.

Because it hurts your nationalistic pride and challenges your fantasy word, you are gripping at loose links and articles in an attempt to change reality despite such links and articles say nothing at all about the current coproduction rate.

In the end, you are only making a fool of yourself. But then that is old news to everyone here.

Russian sources report? BS. Sukhoi never publicly disclosed what is behind the 10 year old contract Sukhoi has with China, allowing only journalists to speculate, quite wrongly. Neither has Sukhoi given an official explanation on the modifications photographically seen and verified on the J-11 and J-11A. These modifications are not uniquely Chinese because they are also seen with the Su-27UBKs that were imported.

You have that YJ-91 picture handy perhaps?

I have it here but i can’t post pics to AFM anymore due to exceeding quota.

Nonetheless you can see it here.

http://www.sinodefence.com/airforce/fighter/j8ii_weapons_pic04.asp

It says Kh-31A supersonic antiship missile however i never seen an Kh-31 that is colored like that. All the ones I’ve seen on the Su-30MKK were all black, and shipment for Kh-31A to China were for the Su-30MK2. However, if this is YJ-91, I can’t rule out if this particular missile isn’t just an ARM version, but an AshM version.

Note the use of the R-27 in this plane along with the export SD-10 (PL-12).

On the JH-7A, was counting the wingtip point too.

What a childish way of trying prove an argument the videos do not prove those J-11B shown there are new airframes that do not belong to the 110 kits delivered by Russia, the aircraft can be kits delivered by Russia modified with new chinese designed parts, simply like that, the F-2 for example is not a F-16 in the complete sense of the word, it has many modified structures, but still is based upon the F-16 and still was built in the numbers the US and Japan agreed, also in 2006 the Russians reported they were still suplying parts for the Chinese Su-27s, this means China very likely was still asembling few Su-27SK kits specially if the Chinese content of parts was higher than the early delivered.

BS.

What proof do you have that the kits are used for the J-11B?

The kits include radar and engines. Literally throwing these away huh, so you can put the Chinese radar and engines in.

The kit airframe is for AL-31F. You would have to modify the airframe to fit a wider engine like the WS-10A. That voids the warranty. Even if the airframe can fit the WS-10A directly. It voids the warranty. Even if you use the AL-31F but fit the Chinese radar, it voids the warranty completely.

Read the Jane’s article. The plane is 700kg lighter, has 10,000 hours MTBO (compared to 2000 hours for the SK airframe), and has RCS reduction measures. Where in the SK kit do you find that?

You choose to ignore the evidence that the last kit based plane was 0423, as photo by Shenyang. The J-11Bs have a higher batch numbers, with 0523, 0524 and 0525 being spotted among the prototypes, with one final production type made last December.

For the Russians the J-11B is not a secret, do not try to change my words and twist them in order to scape your own words, i have only argue that is unlikely China has violated the agreement and since publicly it has refused to build more than 110 kits it is unlikely there is a secret agreement and has build J-11s own her own without Sukhoi`s consent.

What agreement? You have shown no agreement. Prove it by showing what this agreement is by Sukhoi’s own words or articles, not from some jounalist speculating.

many nations modify their aircraft with domestic products Japan and Israel are two good examples with their F-15s and F-16s, the J-11B is not the examption but it does not mean that China has opened a new line of unlicensed Su-27SKs as you are claiming.

You cannot take Japan and Israel as an example. Unlike China’s contract, the F-15J and the F-16I, or even the Japanese F-2 was completely in the public eye, and a lot of the details are available in open source.

As a matter of fact, the F-16I’s radar and engine are non indigineous. The F-15J is a modified version of the APG-63. It is not a new radar entirely nor indigineous. The F-16I airframe is still a spot copy of the Block 52plus, and the F-15J airframe is the same as the F-15A to D. None of them basically differ in the weight and flight hours MTBO from the US version.

In the J-11/Su-27SK deal the only legal looser will be Lyulka since the WS-10 can be a perfect replacement for the AL-31s and does not break any license since the WS-10 can become main spare engine for Chinese Su-27s

You have absolutely no proof that the J-11B is from the licensed line. If there is a kit contract, the kit contract would have disallowed unapproved modifications that were done after the kit.

What you have not realized from this. Even with localized projects like the Su-30MKM and the MKI, the Russians do not allow the juicy bits—the engine, the radar, and much of the armament—to be changed from the Russian model. That’s because all three is the most lucrative part of the design. RWRs, MAWS, HUD, IFF, all those other things are small potatoes, so they are allowed to be Western or indigenous.

On the other hand, the J-11B replaces engine, radar, cockpit, IRST, FBW, brakes, hydraulics, navigation system, communication systems, ejection seat, parachute system, fuel supply system, power generators, EW and chaff system…is there anything I forgot to mention? What is there left of anything Russian? At the same time, moving an airframe from a life of 2000 hours MTBO to 10,000 hours MTBO, have weight reductions through increased composite use, and adapting all the above equipment to the airframe means so many cumulative adaptations to the airframe that it can only mean the airframe cannot be from the kits.

Tell me of any precedence anywhere around the world where a plane would so dramatically depart from its originals so that it uses a brand new engine, new radar, new avionics, new cockpits. Tell me what kind of a licensing that allows you to make such dramatic changes in key components? All this is a massive contradiction to the original SK agreement!