五千年(敝帚自珍)

主题:【原创】关于四代 -- 晨枫

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          • 家园 并非玩笑

            干过工程设计就知道了,很多经验公式还真是经验公式,对过去的东西有效,外推的时候只有凭感觉了,但新设计还就需要外推,所以只有凭感觉后根据实测数据修正老经验公式。在没有完整的风洞、计算机、X飞机数据的情况下,沈飞直接设计生产型歼-8,困难肯定是大大的。

            • 家园 呵呵,沈飞只管生产,设计跟它没关系。

              当时,国内的环境是,设计人员理论能达到的东西,在作坊里(只能称作坊了)做不出来,可军方的心比设计人员还要大。

              试飞的时候,就可以修正你说的数据了。后面那几个型号可以说明。当然,如今的模式可能跟当年不同。

      • 家园 TG的双尾翼

        点看全图

        外链图片需谨慎,可能会被源头改

      • 家园 即使有经验,也很有限---需要祷告和在实践中多积累

        同时很冒险的是这很模糊的可变进气道+DSI

    • 家园 跟着晨大,裤衩也红得发紫
    • 家园 绝对是好文啊,嘻嘻。谢谢分享啊
    • 家园 【转贴】老外媒体的搞笑评论,以及超大网友的给力翻译

      Is This China’s First Stealth Fighter?

      They could be the products of a Chinese government misinformation campaign. They could be clever Photoshop jobs by Chinese aviation fanboys. Or they could be the real thing: the first hard evidence of the long-rumored Chengdu J-20, China’s first stealth-fighter prototype.

      The above photo and several others surfaced over the Christmas weekend on Chinese Internet forums, catching the eye of Aviation Week fighter guru Bill Sweetman. Sweetman, a noted skeptic in the sometimes enthusiastic world of fast-jet journalism, stressed that the pics might be fakes. Fantastical Photoshop art is a hallmark of Chinese military-themed Websites. See the giant, flying “heli-carrier,” or the submarine flattop — both creations of over-excited Chinese Photoshoppers.

      But there are hints that the J-20 photos are for real — and that much clearer shots exist, somewhere. “Rumor has it that better shots have put in transient appearances on Chinese Websites before being zapped by the censor,” Sweetman wrote. That those rumored photos were yanked is itself perhaps proof that Beijing really does have a new fighter. “In China’s military fan Web culture, the rapid intervention of the censors is always a boost for the credibility of the poster,” aviation journalist Rick Fisher told Sweetman.

      Most convincingly, the airplane depicted in the snapshots apparently has many of the right characteristics for a fifth-generation stealth-fighter prototype: a chiseled front-section, triangular wings, all-moving tailplanes. In fact, the supposed J-20 seems to combine the front fuselage of the U.S. Air Force’s F-22 with the back half of Russia’s T-50 stealth prototype, which appeared a little less than a year ago.

      If it’s real — and that’s a big if — the J-20’s appearance could signal a big step forward for the Chinese air force, which to date relies mostly on airplanes bought from Russia or reverse-engineered from Russian or Israeli designs. Panicky Western air-power advocates, who a year ago claimed America would be “less safe” if the Pentagon pressed forward with plans to end production of the F-22 stealth fighter at 187 copies, might just announce the end of America’s 50-year dominance of the skies. Alarmists made similar claims when the Russia’s new T-50 fighter first flew, despite that plane’s many non-stealthy attributes and dubious production prospects.

      The Pentagon hasn’t had a chance to comment on the J-20 photos, but is likely to remain sanguine. In deliberations over the F-22, Secretary of Defense Robert Gates acknowledged that the Chinese were working on a stealth fighter, but insisted the Communist country would have “no fifth-generation aircraft by 2020,” while the U.S. would have more than a thousand F-22s and F-35s. In the year-and-a-half since Gates made that claim, the Pentagon has delayed F-35 production and China has apparently accelerated its own stealth development — alleged J-20 photos aside — but the spirit of Gates’ assertion remains valid.

      Even if the photos are real and the J-20 exists as more than blueprints, there’s probably no cause for alarm. The U.S. flew its first stealth prototypes — the YF-22 and rival YF-23 — in 1990; the J-20 hasn’t even flown yet. It took 15 years for the F-22 to enter front-line service; considering China’s quality-control problems with high technology, it could take a decade or more for the J-20 to appear in numbers that make any difference in the Pacific balance of power. Gates might have been slightly off in his assessment of the Chinese air force, but probably not by much.

      And that’s all assuming Beijing’s Christmas stealth-fighter surprise isn’t all just Photoshop magic. With so little good information on military hardware coming out of China, fighter fakery is a real prospect. In which case, we’ll keep waiting for China’s first stealth fighter to make its true debut.

      Update, 7:28 EST: There’s another photo up — the clearest yet. “The impression here is of a big, long aircraft, 70+ feet from nose to tail, which would make sense for a number of reasons,” Sweetman wrote in reaction. He speculated the J-20 might have “lower supercruise performance and agility than an F-22, but with larger weapon bays and more fuel.”

      “Why would China need or want a short-range stealth aircraft?” he continued. “Any targets with defenses that call for that capability are a long way from the mainland. Also, the bigger that the aircraft is, the more likely it is that it is a bomber as much as, if not more than, a fighter.”

      http://www.wired.com/dangerroom/ ... st-stealth-fighter/

      1990年美帝的YF-22和YF-23初经人事,不知TG现在是否也尝到个中美妙滋味?网上流传一组打了马赛克的J-20艳照,有人像复读机只会一句“阿娇还是处女“,有人认为陈老师已经中出n次,还有些砖家叫兽认为这是战略忽悠局在忽悠着你

      中国的成年男性喜欢的网站在疯传这些图片。图片上的妹子看起来具有很多最新一代隐飞的萌点,胸前曲线凹凸有致,三角形的下着充满诱惑,还有扭来扭曲的丰满臀部。这妹子正面的姿势是美国F-22的,后入的动作有俄罗斯T-50风格

      J-20萌妹子的出现震动了广大业界大叔,他们本以为这个妹妹要过个十来年才会出面接客。J-20妹子小猫步乃是TG的的一大步,从此PLA不用整天对这露西亚或者犹太国的新款式打飞机了

      纠结不已的分析家还在为F-22 和F-35妹子担心,难不成好日子到头了?

      当初露西亚的小loli T-50登场的时候他们也是神神叨叨的

      五角大楼刚刚推迟了F-35量产计划,让想买一个回去暖被窝的诸位好生着急,结果TG就乘势加快了妹子养成计划。

      不过J-20还没有真正的体验过“飞”入云端的感觉,当年F-22可是调教了15年才成为合格的奴仆的。考虑到TG在各种新道具上的质量问题,起码要过10年J-20才能成为喷出太平洋另一半的妹子。盖茨可能会多看TG家的小mm几眼,但是应该不太多

      外链出处

      • 家园 西方经常拿YF-22到F-22花了15年说事

        这其实是不可比的,首先,YF-22到F-22这中间经历了冷战结束、美国突然没有了紧迫感的原因,同理,“台风”和“阵风”用了空前长的时间才服役。要是冷战还在继续,只要一半时间甚至更短就可以服役了。第二,中国有紧迫感,也有钱,没有理由慢慢来。个人估计,2018年服役都是保守估计,2016年还接近一点,如果现在的技术验证机没有出现大的问题,或者发动机、航电……出现大的脱节。

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