Australia Air Power on J-20
Dr Carlo Kopp
Over the last few days imagery of what is claimed to be China's new stealth fighter has appeared on a range of Chinese Internet sites. There have been no official disclosures as yet, so many of the claims appearing in the media may only be speculation presented as fact.
在过去几天里被称为是中国的新型隐身战机的图片在大批中国军事网站上出现。现在还没有官泄，所以很多细节大家其实都是在YY。（不过作者基本默认不是PS)
The aircraft may be a technology demonstrator or a prototype for a mass production fighter aircraft. The latter is however much more likely, given that the PLA Chief of Air Staff claimed an IOC later in the decade.
这架飞机既可能是技术验证机，也可能是量产型号的原型机。但是后一种可能性更大，因为中国空军的大佬曾公开声称某丝带机十年内入役。
What the imagery shows is a large fighter, approaching the size of an F-111, with a canard delta configuration and pair of outward canted all moving vertical tails. This configuration will provide good sustained supersonic cruise performance with a suitable engine type, and good manoeuvre performance in transonic and supersonic regimes.
图片中出现的是一架大型战斗机，接近F111的尺寸，配备鸭翼，三角翼以及一对外倾全动尾翼。这一设计，如果配以合适的发动机，可以很好的实现超音速巡航，同时在跨音速和超音速范围内提供良好的机动性。
Of most interest is the stealth shaping, which is considerably better than that seen in the Russian T-50 PAK-FA prototypes and in the F-35 Joint Strike Fighter. The Chinese design appears to be largely built around the stealth shaping design rules employed in the F-22A Raptor. The chined nose section and canopy are close in appearance to the F-22. The trapezoidal inlets are closest to the F-22, but employ an F-35 style boundary layer control design. The wing fuselage join angle, critical for side aspect stealth, is very similar to the F-22 and superior to the Russian T-50 PAK-FA prototypes and the F-35 Joint Strike Fighter. The flat lower fuselage is optimal for all aspect wideband stealth. Planform alignment is impossible to assess until in flight imagery becomes available.
最令人感兴趣的是其隐身外形设计，该设计比在俄T50以及美F35原型机上见到的都更优越。中国的设计很大程度上遵循了F22A的隐身外形原则。梯形进气道和F22的最为接近，但是应用了F35那种鼓包进气道设计。对侧面隐身尤为关键的翼身融合角度与F22极为相似，而优于T50原型机以及F35。平整的机腹有利于各个角度的长波隐身。但是平台的线形尚无法研判，只能等待收费后飞行姿态图片流出了。
The aft fuselage, tailboom, strakes and nozzles are not compatible with high stealth performance, but may only be stop gap measures to expedite flight testing of a prototype. The airframe configuration and aft fuselage would be compatible with an F-22 style 2D TVC nozzle design, or a non-TVC rectangular nozzle designed for controlled infrared emission and radio-frequency stealth.
后机身，尾撑，边条，以及喷口的设计与高度隐身要求并不相符。但是这可能只是临时的权宜之计以尽快实现原型机上天。气动外形设计与后机身设计应可以（在未来）搭配类似F22那种二元矢量喷口，或者非矢量的方形喷口以降低红外辐射并实现对雷达波隐身。
The PLA have not disclosed the engine type. There are claims that the Russians supplied supercruise capable 117S series engines - these would not be sufficient to extract the full performance potential of this advanced airframe.
PLA尚未透露发动机型号。有消息称俄国提供了其可实现超音速巡航的117S系列发动机，但是该型号将无法充分发挥这一先进气动外形的全部潜能（WS15，就看你了）
The airframe configuration is compatible with ventral and side opening internal weapon bays, and large enough to match or exceed the internal weapons payload of the F-22A Raptor. Internal fuel fraction may also be high, given the fuselage configuration and large internal volume of the big delta wing.
外形设计应可支持中开门或侧开门内置武器舱。尺寸应不小于F22的内置武器舱。机身设计以及大尺寸三角翼说明内置燃油舱也应该非常大。
Other unknowns are the intended sensor suite. China has yet to demonstrate an AESA radar, or an advanced indigenous emitter locating system. However, these could become available by the time this airframe enters production.
其他未知细节包括雷达传感器系统。中国目前尚未展示主动相控阵雷达或其他先进的主动探测系统。但是这些系统有可能在飞机正式生产时研发成功。
The size of the airframe, and its evident focus on supersonic persistence, suggests at a minimum an intention to provide a long range interceptor for air control in the Second Island Chain geography. This capability by default would provide the ability to penetrate an opposing IADS to destroy assets like AWACS, other ISR systems, and tankers. Suffice to say, with suitable internal weapons, the design could be employed as a penetrating strike aircraft, in the combat radius class of the F-111 or Su-34 Fullback.
这一飞机的尺寸以及其明显的强化超音速巡航设计至少说明该机的设计意图是提供长程拦截与制空能力直达第二岛链区域。这一能力将使该机可以穿透敌对的整体防控系统攻击预警机，其他情报指挥系统，以及空中加油机等目标。毋庸讳言，配备了合适的武器系统后，该机可以以被作为战役纵深攻击力量使用，其打击半径处于F111与SU34这一级别。
The notion that an F-35 Joint Strike Fighter or F/A-18E/F Super Hornet will be capable of competing against this Chengdu design in air combat, let along penetrate airspace defended by this fighter, is simply absurd.
认为F35或者F/A18大黄蜂之流可以与成都歼20这一机型进行空战对抗，甚至可以突破由这一机型组成的防线的观点纯属脑残。
（不要再跟我说什么引进逆火了，我们根本不需要，哈哈）
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