The back of both the J-20 (i.e. both the nozzles) and the truck can be seen. What this means is that the picture was taken behind both of them. Since the truck is in front of the airplane, we know that the truck is at a greater angle in relation to the camera than the airplane. Looking at an object at a closer oblique angle will make it seem smaller, meaning that the truck would seem smaller in relation to the airplane than it really is. i.e. your measured J-20 size will be larger (probably only slightly if the picture is taken from a distance away) than it really is. That would mean that, basing on this reasoning alone, your measured J-20 size (20.16 m) can only be smaller (however slightly) than actual. (Of course this works purely on geometry and neglect the camera lens effect which probably can go both ways.)

Regretably, almost all of such measurements based on very low quality photo.
By GE photo you can even get 19 meter more or less.

The fuel fraction of the J-20, coupled with its large finesse ratio, means it is a design built for speed over maneuverability.
That does not mean it cannot maneuvre, but it does mean some sacrifices have been made to what the maneuverability could have been to benefit speed and range.
Hence why I see it as an interceptor/interdictor more than an aircraft bred for dogfighting.

Pushing by the possibly weak powerplant, we have to aim the speed first. The crisis of South China Sea ordered 10 ton class internal fuel to endure a long range for intercepting any invaders, thus, the J-20 like an interceptor more than air dominated fighter.

_______________________F-22______PAK FA______ J-20

Empty Weight____________19.7________19_________20
Internal Fuel ______________8.5________9 _________10
Internal Weapon Load_______2__________2__________2
External Payload ___________8__________9__________6
* ton for service version

You can see the J-20 be close to an interceptor more from weight distribution

My question for the inventor is what’s the shape of those front door and rear door which cover the chambers? My understanding is you didn’t abolish the compressor although you blamed them as too heavy. We’d better know that no matter how do we design the chambers, the airstream come from compressor still is a high speed air flow, much much higher than any train’s speed, how does your movable door deal with these high speed and pressure stream? I didn’t see any swept angle being there…

The term interceptor specifically refers to dedicated interceptors like the F-106, MiG-31, etc. By definition they are highly specialized aircraft. The Flankers, Eagles, and Raptors are air supremacy fighters. Although they are capable of the interceptor role they are not called interceptors.

Now that nomenclature is established, I propose we move on.

I don’t think J-20 is any kind of pure interceptor, due to the volume of interceptors, those were always larger than contemporary fighter, he expressed interceptor heavy class, I saw what did he mean.

If we got some kind of software from FBI and CIA.

Well, that’s what the image says 😛
A radome’s size is dependent on the cross sectional area of the nose. We need a comparison of cross section, not simply nose width. Because neither the F-22 or the J-20 have a circular nose cross section, you can’t simply judge diameter by width, and you’d need to pay attention to their respective geometries to figure out that cross sectional area.

If you don’t believe, you can do it by yourself.

See, I told you, but you didn’t.:diablo:
For honesty, show you original photo:
with slant but full size of main wheel:

with diameter of main wheel was cut by horizon:

J-20:

To the full wheel sized edition:
[IMGhttp://i66.photobucket.com/albums/h276/emile_bucket/J-20_MightyDragon/J…]
To the long focal length:

I enlarged F-22 as big as possible for cutting the size of J-20 down.
The truth can be covered?

歼20的机头相控阵雷达是四代机之中最大的。
And the dimension of its radar will be the largest among all 4th gen (including F-22, F-35 and T-50).

That’s great, my overlayer made this impossible according to the size someone insisted.
Nothing more I want to say, just see the image.