美 Lexington 연구소에서 분석한 Chengdu J-20

 

작년 12월 인터넷을 통해 사진이 공개되고, 지난 1월 11일 초도비행을 실시한 중국 Chengdu J-20 스텔스기와

관련하여 3월 2일 美 Lextington Institute 의 Loren Thompson 박사가 분석한 글을 소개 합니다.

 

그동안 공개된 J-20 관련 각종 사진들을 토대로 알려진 제원과는 달리, J-20 의 전체적인 제원은 F-22 Raptor

와 F-15C Eagle 과 비슷하다는 분석이며, 주익 면적은 F-15C 와 거의 비슷하다고 합니다.

 

J-20 의 Maximum thrust 는 F-15C 보다는 높고, F-22 에는 다소 못 미친다는 분석 입니다.

 

이외 J-20 가 5세대 스텔스 전투기로써 요구되는 각종 성능을 갖추었느냐에 대한 불확실성과 중국의 기술력이

이를 뒷받침 하기에는 부족하다는 점을 지적하고 있습니다만, 중국 본토에 대한 방어적 입장에서 보자면 J-20

는 충분한 능력을 전투기로 평가하고 있습니다.

 

아래 소개하는 사진들은 美 공군 F-22 Raptor 스텔스 전투기들의 다양한 비행 장면 입니다.

 

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Early Warning Blog

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

 

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.

 

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.

 

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.

 

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.

 

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.

 

© 2009 Lexington Institute. All Rights Reserved.

 

 

  ⓒ USAF

 

  ⓒ Lockheed Martin

 

  ⓒ Lockheed Martin

 

  ⓒ Lockheed Martin