well``dont take my words for granted, these are my understandings of certain infos``
China's J-20 a derivative of Russia's withdrawn 1.44 fighter
- Staff Reporter
- 2014-05-04
- 09:00 (GMT+8)
Russia's 1.44 fighter (Internet photo)
The Chengdu J-20, China's first fifth-generation stealth fighter has weak aerodynamic design according to Andrei Chang also known as Pinkov, the chief editor of Kanwa Defense Review based in Canada, as it is based on the Russian-built Mikoyan Project 1.44 fighter.
Although Russia denies it has ever provided China with the blueprint of the 1.44, Pinkov said that the engineers at Chengdu Aerospace Corporation did study the design of the Russian fighter. Originally, Andrei Chang believed that the J-20 was purely a Chinese design, however, sources from Russia told him that there remains the possibility that Mikoyan sold China the blueprint of the fighter.
With the birth of the more advanced Sukhoi PAK FA fighter, the status of the 1.44 remains unknown while most experts believe that it has already been withdrawn. Russian experts told Pinkov that the 1.44 has not been withdrawn because it was a bad design, but rather because it does not fit with the needs of the Russian Air Force. Since it has a huge fuselage, the 1.44 is not as maneuverable as the US Air Force's F-22.
Mikoyan was also out of budget to complete the design of its first stealth fighter, according to rumors. Still, the design of the 1.44 seems to have been valuable for China which has no experience in developing its own stealth fighter. There are still some differences between the 1.44 and the J-20, however. The 1.44 has a large box-like intake that blends into the rear fuselage, for example, while the J-20 has a low jet engine intakes design similar to the F-22.
China has a tradition of using the designs from withdrawn fighter programs of other nations according to Chang. The Chengdu J-10 was designed based on the Israeli Kfir, for example. However, most of the 1.44's weaknesses would have been inherited by the J-20 if the latter was designed according to the blueprint of the former. It may be too large and too heavy for aerial combat, for example, as well as sharing its weak aerodynamic design.
looks like a clay-more cutting through the wind.
Stealth Radar Tests On Passenger Jet
By Jeffrey Lin and P.W. Singer
Posted 06.09.2014 at 10:15 am
Tu-204 Tests J-20 Radar Tu-204 number 769, a Russian origin jetliner belonging to the PLAAF's flight testing regiment, is now testing a radar for the J-20 fighter, as shown in a television clip. cjdby.net
The China Test Flight Establishment's (CTFE) Tu-204 has been modified to carry a stealth fighter radome on its nose. Previously, the Russian origin Tu-204 jetliner had been reported to test Chinese air to air refueling technologies. Given the shape and large size of the radome, it is likely that the radar being carried by the Tu-204 is for the J-20 fifth generation fighter. The projected radar for the J-20 is likely the Type 1475 Active Electronically Scanned Array (AESA) radar, which provides improved range, transmission power and frequency compared to 1970s era mechanically scanned radars. The F-22's AN/APG-77 radar was also tested on a Boeing 757 during its development.
Chinese Fighters' AESA Radars Shown here are photos and line drawings of Chinese AESA radars. The top one is for the J-10B fighter and has about 1200 transmit/receiver (T/R) modules, the middle one is for the J-16 strike fighter and has 1760 T/R Modules. The bottom one destined for the J-20 5th generation stealth fighter, and has 1856 T/R modules (generally, the more T/R modules on an AESA radar, the more powerful and flexible it is). China Defense Forum
The current J-20 prototypes, numbers 2001, 2002 and 2011, most likely carry AESA radars themselves to test the radar performance and to simulate the characteristics of production J-20s as closely as possible. Even so, the People's Liberation Army Air Force (PLAAF) would want to also test the Type 1475 radar on a jetliner, since the larger aircraft have additional space to provide onsite monitoring and diagnosis by engineers and equipment. Having a dedicated Tu-204 test platform for the J-20's radar would also allow CTFE to schedule flight tests solely on the needs of evaluating the radar; the test flight schedules of the J-20s would also have to factor in questions about engines, stealth and maneuverability.
Stealth Radar Tests on Passenger Jet | Popular Science
J-15 yes, J-11B not sure
