Doctor Song paper
- Thread starter MiG-29
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I translated it in this thread:
http://www.sinodefenceforum.com/mem...inese-military-articles-take-look-6-5679.html
Post 84 is the latest updated edit and post 76 shows the graphs of data gained through wind tunnel testing.
http://www.sinodefenceforum.com/mem...inese-military-articles-take-look-6-5679.html
Post 84 is the latest updated edit and post 76 shows the graphs of data gained through wind tunnel testing.
Siege has it posted here, the interesting thing about Dr. Songs Paper is that it tends to be more honest than much of the propaganda stuff we have seen in the past, it is well thought ought and I'm sure peer reviewed... I asked seige if he was western educated because of the general tone of his paper is up to the high standards that I have found in the past in the Air Force Magazine, with lots of critical thinking and arguments pro and con.!
The propaganda style paper, otherwise known as "baguwen" in Chinese, are used to appease leaders/project directors. Dr. Song is first and foremost a researcher. There is a huge difference between writing cut and dry IEEE format research papers and articles filled with flowery proses praising a particular individual/team.
I am currently translating an article on Zhao Yijun, who is a professor working in the field of DEW research. The article was from an official scientific magazine and although it is a lot less fluffy than your typical baguwen, the style is similar. You'll see the difference once I post it here.
MiG-29
Banned Idiot
he made Rafale with stealth
---------- Post added at 11:39 PM ---------- Previous post was at 11:37 PM ----------
It seems in China reseach is advancing quiet fast, at least have been more open to new trends recently i read sweden wants to adapt DSI to gripen, this is much slower then China`s design trends
---------- Post added at 11:59 PM ---------- Previous post was at 11:39 PM ----------
It is logic, no aerodynamic configuration, is perfect.
not even F-22 or T-50, all lose something.
Here i leave you a paper from Pavel Bulat, he wrote a paper about J-20 he more or less mention TsAGI was visited by Chinese specialists in the 1990s, and more or less says what research could have been useful for the J-20, specially for the canting of the canards and position of the tail, he gives the explanatiion citing the Su-33 program where they canted the canards and the angles that were studied for the Su-33, and the russian studies for tail size and position that were later applied on MiG-1.44.
His remarks were in a way quoted on air fleet magazine, and in Russian Popular Mechanics of course western and russian specialists are working trying to find out the pros and cons of J-20 and the current chinese design philosophy of fighter design
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Well the planform of the mig 1.42 and the J-20 are apparently very similar, the difference in the intakes, and the canard being in the same plane as the main wing and forward fuselage and strakes. But there is very little doubt that the delta and vertical stabs are from the same genetice pool, I really couldn't read the text at all but the drawings are good, but having said all that the J-20 is quite good, and the flight control system very well integrated into the overall design.
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MiG-29
Banned Idiot
in my opinion Song`s paper is very good for understanding the compromises China has done on J-20, the role of the jet, Pavel Bulat more or less says what the air fleet magazine says, however he tells that Sukhoi with Su-33 faced problems of drag and lower lift, so they canted the canards of Su-33 as McDonnel did on F-15 VECTOR or on HIMAT, it has been known in the west how canards react according to the position with respect the wing, so he is saying J-20 used the same solution
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MiG-29
Banned Idiot
I think the design is Chinese, but it blends features seen in previous jets.
In my opinion Song`s paper is not innovative at all, i mean it does not bring anything new in aerodynamics that was not known in the West or Russia, but do not rush and take me wrong, Song`s paper is in my opinion the aerodynamic concept behind J-20, so yeah is a good one.
Su-33 has blended wing-fuselage configuration with lifting body traits, LERXs and canard, canards with dihedral, it only does not use delta wings.
Rafale uses blended wing-fuselage configuration with lifting body traits, LERXs and canard, but its canards are without dihedral, it does use delta wings.
J-20 is unique, it is chinese, but it has more or less the same configuration of Rafale, however it has some differences, first rafale is a closed coupled with high canard, J-20 is long coupled with canard and wing roots coplanar and dihedral on the canard, Rafale has no dihedral.
Rafale has midwing while J-20 has high wing.
So the J-20 only resembles Rafale superficially.
Like Eurofighter it is long coupled, but the canard has a shorter lever arm with respect the center of gravity but it is well behind the supersonic mach cone, Eurofighter has the canards near the nose of the jet