HROBOS
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1. Stop trying to ignore the subject and face the facts. The Su-35BM and Su-33 use very similar airframe. However, the reason they are almost wholly different is because their internal technologies, avionics, etc, are different. The reason the J-11B and J-15 is not the Su-27 (or any Sukhoi aircraft) is because they use completely different internal technologies that put their capabilities much higher.
2. We are talking about a brain/muscle/organ transplant here, not some "cosmetic changes". The J-11B is essentially a completely new and different aircraft that is stuck inside an empty Su-27SK airframe. Everything else is completely different, new generation, and Chinese designed.
1. They studied a Su-33 prototype from Ukraine back in the 1980s, but it is unknown if anything were used. The J-11B and J-15 use completely new technologies compared to the Su-33. Only their airframe is similar.
2. No. The J-11B is almost on par with the Su-35BM. The J-20 is believed to have superior stealth and maneuverability than the T-50. The J-15 is comparable to the Rafale-M and Super Hornet. Do some analyzing and read some military official interviews. Don't rely on your fantasies and stereotypes here.
China launched its first original model of an aircraft in 1969, genius. It's called the Shenyang J-8.
Stop.
1. Your skin is the concept of "plane". If we consider the matter seriously. The skin for the aircraft is covering his paint. The airframe is the skeleton of the aircraft. The airframe is a complex structure. He meets many requirements (aerodynamics, durability, reliability, etc.).
Each aircraft has an individual hull design (or a different appearance).
For example, if we compare the appearance of two aircraft (Su -27, and F-15). Despite some similarities (you will immediately distinguish one from another plane). They are a completely different design. These jets create different aviation schools. These aircraft have a different philosophy. You will not find any similar items.
2. Why China is using the airframe and engines of the Russian aircraft. Because the Chinese aircraft manufacturers are engaged in it from the beginning (the birth of the aviation industry in China). Since the beginning of the MiG is now Su-27/33. The main occupation of the Chinese designers is not the development of new designs. The main task of the Chinese designers is recycling other people's projects.
Processing has two stages.
1. To adapt the model for the possibility of Chinese industry. If the Chinese industry is not technically possible to create what - what part of the aircraft. Chinese designers are trying to find an alternative to them (in the best of my ability).
2. Trying to upgrade. Modernization is basically an attempt to introduce new elements. As a design, and foreign copies.
1. You claim that within plane has changed.
I do not contradict this. Like I said, Chinese engineers are trying to replace some items. This work is in the world is called modernization. In China it is the main occupation.
2. You can not use "alien" airframe / aircraft design to build a new plane.
It just makes no sense. Each airframe has its well-defined size, weight, volume (which depends on the capabilities of the engine and internal equipment). As there are two similar fingerprints, so no two are identical to the case of aircraft. Chinese engineers can not change the body the Su-27. Because they still can not independently develop some systems ..
I repeat once more. China is engaged in illegal copying and licensing (of dubious quality) changes in the original draft of the Su-27.