http://tinyurl.com/4fs7ary （注：本文作者似乎是找了专家分析网上照片而得到了 本文的结论。至於分析是否正确或有没有额外的情报管 道，就有待验证了。约略翻译了一下，如有错误敬请见 谅wwwww） New Details On China's J-20 Fighter Provide More Nuanced View Of Threat Author:Loren B. Thompson, Ph.D. Date:Wednesday, March 2, 2011 Tags:F-15, F-22, F-35, J-20 Aerospace experts scrutinizing images of the Chinese J-20 fighter that first began appearing on the internet in late December have developed a more nuanced view of the plane's features than what was available in early reports. Although the J-20 resembles the outline of the stealthy F-22 Raptor when viewed head-on in its forward aspect, the plane clearly lacks many of the features that make Raptor the most capable air-to-air combat system in history. On the other hand, these same experts believe that over time the Peoples Liberation Army Air Force can evolve the J-20 into a formidable combat aircraft -- especially given the fact that it is expected to operate in or near Chinese airspace, where it will greatly outnumber any attacker's planes. 航太专家经检视於去年十二月开始出现於网上的中国 J20的照片得到了较原先更加细腻的了解。虽然J20之 前视外貌类似F22，实际上却明显地缺乏许多让F22成 为史上最有威力之空战战机的特点。然而，这些专家也 相信假以时日解放军空军能使J20发展为强大的战机─ ─特别是考虑到它的被期望的作战环境是中国空军能数 量上压倒敌人的领空及其周边。 Early reports that the J-20 exceeds 70 feet in length appear to be wrong. By comparing the scale of the aircraft with adjacent reference objects whose dimensions are known, experts have determined that the fighter is 62 feet long – the same length as the F-22, and not much different from the 64 feet of the F-15C fighter. Based on overhead imagery and other inputs, wingspan looks to be about 41 feet, also similar to F-22 (45 feet) and F-15C (43 feet). However, the wing area of roughly 630 square feet much more closely resembles the 608 square feet of the F-15C than the 840 square feet on the F-22; this matters a great deal in terms of range since fuel is stored in wing areas. 早期的报告称J20有超过70英尺的长度似乎是错的。经 比较其周边相关已知尺寸的物体，专家判定其长度为62 英尺──和F22相当，而和F15C没差多少。根据上视 图以及其它管道了解，其翼展约41英尺，约略相同於 F22 (45英尺)和F15C (43英尺)。然而，其翼面积630平 方尺较接近於F15C的608平方尺而不是F22的840平 方尺。由於油料可储於翼内，此一较小的翼面积严重地 影响了航程。 The J-20's top speed is judged to be below Mach 2, meaning it is significantly slower than an F-22 or F-15C. Little is known about the performance features of the J-20's twin jets, which may be based on technology from the western CFM-56 commercial powerplant first exported 30 years ago. The steady-state thrust provided by the engines is probably similar to the 29,000 lbs of the F-15C, but greatly inferior to the 48,000 lbs generated by the two F119 engines on the Raptor (J-20 maximum thrust of 60,000 lbs comes closer to the 70,000 lbs of F-22, and surpasses the 48,000 lbs of F-15C). The J-20 does not have the supercruise feature of the F-22 that allows the latter plane to fly at high speed without consuming excessive amounts of fuel, which puts the J-20 at a decided disadvantage given that it carries about 25 percent less fuel internally than the F-22. It also does not have the vectored thrust of the F-22 that provides enhanced aerial agility; the Chinese appear to have modified the fixed exhaust nozzles on the J-20 with an eye to misleading western observers concerning how capable the propulsion system is. J20的极速被认为低於两马赫，低於F15C或F22的极 速。（专家）对於J20的可能发展自西方30年前出口之 CFM-56商用引擎的引擎性能所知有限。J20的双引擎可 能能提供近似F15C引擎的29,000磅稳态推力（注：这 里指的应该是F100-PW-100的军用推力），但该推力远 逊於F22的两具F119的48,000磅（J20的最大推力 60,000磅接近F22的70,000磅而超过F15C的48,000 磅）。J20没有如同F22般能高速飞行而不用大量消耗 油料的超巡性能，这让其处於决定性的劣势，特别是其 内载油料已较F-22少了25%的情况下。J20亦没有像F22 采用能提高敏捷性的向量喷嘴；中国方面似乎改动了固 定式的喷嘴试图误导西方观察家对於J20推进系统性能 的看法。 The J-20 airframe incorporates extensive low-observable (stealth) technology into its forward aspect, although it is more readily tracked from side and rear angles. However, even in the forward aspect some design features such as the engine inlets appear sub-optimized for reduction of radar cross-section. It is not clear how extensively designers have used radar-absorbing materials. It is also not clear what kinds of on-board electronics the J-20 will eventually carry in its operational configuration. Electronic sensors, processors and datalinks are the heart of the F-35 Joint Strike Fighter, greatly surpassing the performance of even those on the F-22. J20的机型对前向采用了大量的匿踪科技，虽然侧向和 後向的匿踪较差。然而，即使是前向匿踪，有些设计， 像是引擎进气口，似乎并未对缩减雷达截面积最佳化。 设计者采用了多少雷达吸波材料在J20上未知，最终机 上将采用何种电子装备於其量产机型亦未知。感测器、 处理器、资料链是F35联打机的心脏，其性能甚至远超 过F22所使用的。 While the J-20 superficially resembles fifth-generation fighters such as the F-22 and F-35, experts do not believe Chinese designers will be able to produce an airframe that comes close to matching the maneuverability, survivability, lethality or situational awareness of an F-22 or F-35. However, they may not need to if they can lure enemy fighters into Chinese airspace where they have other "home court" advantages. 虽然J20表面上形似如F-22和F-35的第五代机，专家 们并不相信中国设计者们能造出一架在机动性、生存 性、攻击性或状况意识能力和F-22或F-35相当的飞机。 然而，当他们可引诱敌人进入他们有「主场优势」的领 空时，他们并不需要那麽做。 Loren B. Thompson, Ph.D. --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 74.111.48.3 重点是空重多少不知道。从正面看来，J20是蛮「厚」的… ※ 编辑: ryannieh 来自: 74.111.48.3 (03/31 20:21)