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Nézd meg nagyban a kínai lopakodót!

Először mutatta meg magát a nagyközönség előtt Kína ötödik generációs típusa, a Csengtu J-20 vadászbombázó. A hétvégén rendezett Airshow China alkalmával az ázsiai ország csúcsvadászának két példánya is közszemlére tétetett.

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    The latest issue of ordnance industry science and tech told that there are more than 50 J-20 has already produced by CAC, and China will produce 200 to 300 J-20B that entered production this year.
  • Azt meg tudom érteni, hogy kéne nekik sűrgősen 200-300 gép, mivel az F-35 is nagyon gyorsan terjed a környékükön. De, hogy ilyen gyorsan le is tudnák gyártani őket????
  • Mackensen
    Azt meg tudom érteni, hogy kéne nekik sűrgősen 200-300 gép, mivel az F-35 is nagyon gyorsan terjed a környékükön. De, hogy ilyen gyorsan le is tudnák gyártani őket????
    Nem tűnik lehetetlennek, évi 40-50 darab. Viszont még hangsúlyosabb lehet, hogy ténylegesen mennyire van kész a gép. Ha 200 db-nál jön ki náluk hasonló gigszer, mint amibe az F-35 is beleszaladt, az hatalmas szívás lesz.
  • Mackensen
    Ok, de ott voltak mindenféle számok is: 2,1-2,2 a J-20 esetében.
    ??
    "open lift coefficient"-nek fordított valamit. Soha nem hallottam róla, hogy mi az. Ez fordítási zizi lehet.

    "Its lift coefficient is not less than 2.1-2.2, the first in the world"

    Ez meg simán értelmetlen, mert a Cl és a Cd s állásszög függő. Ezen felül ez az érték ebben a formában semmitmondó.
  • J-20 to be like a bee on radar

    According to CCTV’s report on CETC, its experts are testing a special stealth equipment as small as a cigarette box, to make stealth fighters like a bee on radar.

    It’s speculated that once the new equipment is developed, it would be applied to J-20 fighter.
    Besides, CCTV also unveiled the corporation’s RCS measuring microwave chamber, which has a group of metal balls of different sizes. And its RCS standard ball is as big as an American football, indicating that J-20’s initial stealth performance is as good as F-22.

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  • J-20 has the highest lift coefficient and aerodynamic layout better than F-22: expert

    According to a report from China’s “Ordnance Science and Technology” magazine on August 24, prior to July 15, the State Intellectual Property Administration of China announced the results of the 21st China Patent Awards. And the appearance design patent of J-20’s “lifting body side strip canard wing layout” won the gold prize of China Patent Award.

    The report quoted equipment expert from the Chinese Air Force – Fu Qianshao as saying that J-20 uses a lift body fuselage, canards, sidebars, wings, rear side rails, camber double ventral fins, and camber full-motion double vertical tails based on vortex control technology. If the design level is high and properly controlled, it will produce huge lift gains and drag reduction effects. And its lift coefficient is about 2.1 to 2.2, ranking the first in the world.

    Fu Qianshao said that the conventionally deployed US F-22 fighter has a lift coefficient reported to be about 1.7 and a supersonic cruise zero-lift drag coefficient of about 0.035. China has used a high-precision scaled-down model for wind tunnel tests, and the measured data are similar to the reported numbers, proving that the lift and drag coefficients of J-20 are significantly better than those of the F-22.

    According to the report, in the conventional layout, when tail flatting maneuver the aircraft to raise its head, it has to deflect downward to generate negative lift and press down the tails, which belongs to the loading rudder surface. However, after the aircraft has a positive angle of attack, it will partially offset the negative angle of attack for the flat tails, reducing its efficiency.

    However, J-20 has a mid-to-late canard layout, with large canard wing areas and long distances from the wings, with a side strip transition in the middle, which can use the multi-vortex interference generated by different aerodynamic surfaces to improve the lift and drag characteristics of the aircraft, thereby improved its control torque.

    In addition, J-20 has larger rear side rails, double camber ventral fins, and full-moving double vertical tails with a larger camber angle. At high angles of attack, the side rails of the rear aircraft can provide certain pitch stability and head-down moment; the camber double ventral fins are located in a low position and are not easily affected by wing turbulence, and can provide certain lateral stability and head-down moment; and due to the large effective rudder surface area, full-motion camber double vertical tails can also play a part in flatting tails.
  • Roni
    J-20 has the highest lift coefficient and aerodynamic layout better than F-22: expert

    According to a report from China’s “Ordnance Science and Technology” magazine on August 24, prior to July 15, the State Intellectual Property Administration of China announced the results of the 21st China Patent Awards. And the appearance design patent of J-20’s “lifting body side strip canard wing layout” won the gold prize of China Patent Award.

    The report quoted equipment expert from the Chinese Air Force – Fu Qianshao as saying that J-20 uses a lift body fuselage, canards, sidebars, wings, rear side rails, camber double ventral fins, and camber full-motion double vertical tails based on vortex control technology. If the design level is high and properly controlled, it will produce huge lift gains and drag reduction effects. And its lift coefficient is about 2.1 to 2.2, ranking the first in the world.

    Fu Qianshao said that the conventionally deployed US F-22 fighter has a lift coefficient reported to be about 1.7 and a supersonic cruise zero-lift drag coefficient of about 0.035. China has used a high-precision scaled-down model for wind tunnel tests, and the measured data are similar to the reported numbers, proving that the lift and drag coefficients of J-20 are significantly better than those of the F-22.

    According to the report, in the conventional layout, when tail flatting maneuver the aircraft to raise its head, it has to deflect downward to generate negative lift and press down the tails, which belongs to the loading rudder surface. However, after the aircraft has a positive angle of attack, it will partially offset the negative angle of attack for the flat tails, reducing its efficiency.

    However, J-20 has a mid-to-late canard layout, with large canard wing areas and long distances from the wings, with a side strip transition in the middle, which can use the multi-vortex interference generated by different aerodynamic surfaces to improve the lift and drag characteristics of the aircraft, thereby improved its control torque.

    In addition, J-20 has larger rear side rails, double camber ventral fins, and full-moving double vertical tails with a larger camber angle. At high angles of attack, the side rails of the rear aircraft can provide certain pitch stability and head-down moment; the camber double ventral fins are located in a low position and are not easily affected by wing turbulence, and can provide certain lateral stability and head-down moment; and due to the large effective rudder surface area, full-motion camber double vertical tails can also play a part in flatting tails.
    A lift coefficient az egy szám, a felhajtóerő (meg az ellenásllás - drag) képletében lényegében beleteszi a szerkezet további paramétereit (+alfa), ami nem a felület (az is benne van, A).
    Ebben talán arra gondol, hogy a felület minősége jobb vagy az össz áramlástani jellemzők (veszteségek) kedvezőbbek? Ez így nagyon üres megfogalmazás nekem, vagy csak nem értem mire akar utalni.

    molnibalage
    "open lift coefficient"-nek fordított valamit. Soha nem hallottam róla, hogy mi az. Ez fordítási zizi lehet.

    "Its lift coefficient is not less than 2.1-2.2, the first in the world"

    Ez meg simán értelmetlen, mert a Cl és a Cd s állásszög függő. Ezen felül ez az érték ebben a formában semmitmondó.
    Ennyi pontosan.
    Szerintem a lift/drag értékre gondolhattak, vagy a felületi terhelésre, ami a gép alapfunkciója miatt lényeges. Vagy valami teljesen másra, ehhez a saját fogalom.
    Az F-22 ugye arra készült, hogy a bázisról felszállva légi tankolással megtámogatva pár száz mérföldet elrepülve a VSZ fölött vágjon rendet, majd spurti haza - ezzel szemben a J-20 alapvetése, hogy nagy távolságra elmegy és szétveri az USAF hátsó sorát (tankerek, AWACS, stb...)
    Na most ez utóbbihoz más aerodinamikai paraméterek optimálisak, hiszen a long endurance eléréséhez más sebességek, így más profil az ideális.

    A "the lift and drag coefficients of J-20 are significantly better than those of the F-22. valszeg az erre a long endurance eléréséhez ideális Cd értékét érthetik az ehhez ideális sebességen (meg ami tolóerő ehhez kell)..
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    De nem tudom. Ez a "jobb" mint a másik egy harci gépnél nevetséges (hülyegyerek meg marketingesdumának jó max). Valszeg a számukra ideális rezsimen a gép jobb számszerűsíthető paramétereket hoz, amit így vezettek le. Vagy nem tudom.
  • Today's article on www.81.cn

    In the hands of a pilot with about 100 hours flight time on a "new modified fighter jet", he scored a zero to 17 air-to-air fights in his favour. This "new fighter jet" is obviously a J20 judged by the 0 to 17 score.

    Also amazing is that the pilot has only about 100 flight hours on this jet, shows easy integration between pilot and aircraft.
  • Roni
    Röviden tömören miről van benne szó ?:)
    Arról, hogy a mostani őszközép ünnep alkalmával állami kitöntetésben részesítették Cheng Ronghuit a WS-15 fejlesztéséért felelős főmérnököt, amiért áttöréseket ért el a fejlesztés stb. stb.

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