主题：【原创】再谈四代 -- 晨枫
家园 赞煽情 特别是这句：
我们不需要替代谁，因为我们一直就在这里，我们只是把自己展现给这个世界。家园 我也是一个读者 我也是一个读者，这篇文章没有完全读完。后面写的的确有此乱，但最后这段仍给了我强烈的共鸣
。泪水涌了出来，花一个。家园 原贴作者文采不错。很能煽情。 最同意这句。
我们天生就知道往中间站几千年，与天地斗，与人斗，造就了中华文明中庸的本质。这城府不是发家三四百年的人能明白的。
家园 谢谢推荐了 送花成功，可取消。有效送花赞扬。感谢：作者获得通宝一枚。参数变化，作者，声望:1；铢钱:16。你，乐善:1；铢钱:-1。本帖花:1
家园 跟完了这个楼 如果十分之一的年轻人有此信心，中国何愁？zxb就不能在网络上搜集一些这样的帖子广而告之么？
家园 链接挂了，我更新一下 在此：
- 复 【原创】再谈四代
家园 Posting on behalf of my suite mate.
To 晨枫：
First off, I'd like to thank you for taking the time to answer my questions. I think the Chengdu J-20 is an interesting study both in its capabilities and its potential competitiveness on the defense systems market.
My friend has told me that you are a Chinese engineer living in Canada but that's all I know, so I was wondering if you could also tell me a little bit about yourself and your education.
What interests me most about the J-20 is how it compares with the Lockheed F-22 considering the shape of the plane itself is so similar. I'm sure that since the F-22 is older that the software is fairly different from the J-20 but do you happen to know how the J-20's flight length and weapon systems compare with the F-22 or even the F-35?
Also, I've seen head-on pictures of the J-20 with one of the vertical stabilizers on the tail turned almost 90 degrees, which my friend claims contributes to maneuverability.
However, if the J-20 were to get in a dogfight and turn the stabilizer that far over, wouldn't the speed of the fighter rip the stabilizer off? Do you know what purpose a fully movable stabilizer would serve besides compactness on the ground?
Thanks again for your time!
家园 你的室友对我们的回答怎么说？ 家园 Response That certainly answers my questions and even a few that I hadn't thought of yet so thank you for sharing your knowledge with me!
家园 对不起，昨天回来晚了，只好今天回复 You are welcome. Chengdu J-20 is more than interesting. It is a game changer. That is a big topic and let's save it for later.
How J-20 compares to F-22 is a question that is on many people's mind. Unfortunately, at this point, other than a few pictures, there has been no technical data released, including geometry (wing span, length, height, wing area, etc.), performance (range, speed, turning rate, etc.), weight/load (empty weight, loaded take off weight, max take off weight, internal weapons load, underwing carrying capability, internal fuel capacity, etc.) and electronics (AESA, IRST, sensor fusion, EW, etc.). All guesses will be just that, guesses. Popularly it is believed that its performance is comparable to F-22 overall but I have no way of confirming or disputing that. However, I am reasonably confident that it should outperform F-35, which is actually inferior to the teen series in terms of speed, agility, etc. because of its dismal thrust to weight ratio and wing load. Believe it or not, it is not that hard to outfly an F-35.
J-20 uses outward canted and all moving twin tails. The purpose of that large amount of deflection is not to enhance maneuverability. However, with that high degree of deflection, it doubles as air brake, together with coordinated moves of flaps and canards, to make sure it slows down level and straight.
Besides that, all moving tails can be more compact, using active control instead of passive stabilization like wind cock. If you look at F-22't tails, you can easily tell the fixed part from the moving rudder at the back edge. The fixed part is that wind cock, resulting from the classic laterally stable design. J-20's smaller V tail is laterally "reduced stability" design, saving on weight and RCS, but more demanding on flight control.
You mentioned that J-20 is similar to F-22. I imagine you refer to the side profile. However, aerodynamics is more determined by "birds eye view" than side profile. J-20 and F-22 are decidedly different from that angle. Aerodynamically, these two are as different as Corvette and Porsche 911, or F-16 and Eurofighter Typhoon.
Hope I answered your questions and nice talking to you.
家园 这哥们真一根筋 However, if the J-20 were to get in a dogfight and turn the stabilizer that far over, wouldn't the speed of the fighter rip the stabilizer off? Do you know what purpose a fully movable stabilizer would serve besides compactness on the ground?J20的垂尾能转那么大的角度，我估计是，J20在空速极慢的情况下依然可以进行各种姿态调整。
J20是数控线传，垂尾什么情况下转多大角度都是软件控制的，高速飞行时自然转不到那么大的角度。所以我说这家伙一根筋，还以为现代飞机的操纵面跟莱特兄弟时代那样，都是铁丝拽的，空中一不小心拽过头，结果垂尾给掰掉了。
