it's just another kind of "canard" and lack of the correct angle against the body, its surface is perpendicular to the body when it is at standing position. and it will block the airflow when mechanical failed ---- no one can 100% guarantee it will not happen.
Dont read too much with your limited IQ which even cannot understand a simple science analogy.
See
YOUR illustration here...???
I understand exactly what you were trying to say with that 'Giant canard' labeling. You ain't that clever, son.
There are four obvious things about you:
- Weak English
- No military experience
- No aviation experience
- Arrogance
The last three items are common to all the Chinese members here.
Regarding that 'Giant canard' label, what you were trying to argue was just flat out wrong and I was having fun at your expense when I teased you about it. Yes, it does not matter if you call that structure a 'canard' or a 'wing' or even a 'cockpit'. It is a structure and under radar bombardment, it becomes a radiator. But my teasing you was meant to be a lesson in that English is the dominant language in science, technology, and engineering, and if your English is weak, do not engage in debating things that you have no experience with. In the end, you
WILL end up looking foolish.
If you want to point out that the wing is physically larger than the canard, use the appropriate labels. Do not try to be cute. The reality is that the canard
IS a wing, of sort. Same as fixed fins that assist in creating axis stability. The canard, just like the wing or the vertical stabilator, is a flight control structure or element. It protrudes into the airstream and affect overall aerodynamic stability.
Now regarding RCS...
Radar Cross Section
- Raleigh region. If the target is a lot smaller than the wavelength of the radar system, the target is said to be in the Raleigh region. If the target is in the Raleigh region, the radar cross section of the target tends to be smaller than the target's physical size.
- Resonance region. If the target is of similar dimension to that of the wavelength, the target is said to be in the resonance region. In the resonance region, the radar cross section of the target may vary a great deal but tends to be larger than the physical size of the target.
- Optical region. The optical region occurs when the target is much larger than the operating wavelength of the radar. This is quite often the case with operational radar systems whose wavelengths are normally in the order of centimetres in length. When operating in this region, the radar cross section of the target is similar to its physical size.
All three of the above are applicable to measure standalone structures removed from a complex body, or to measure the entire complex body itself. The optical region is usually the one of interest because most of the world's radar operating freq is centimetric while their targets have physical dimensions much larger such as the Boeing 747 where fuselage length is about 70 meters.
I explained the basics of the RCS control process here...
Fundamentals of Stealth Design & Concepts of RCS Reduction | Page 2
- Quantity of radiators
On an aircraft,
ANYTHING is a radiator under radar bombardment.
- Modes of radiation
On any body, from a simple sphere to a complex body like an aircraft, shape equals to how EM radiation leave that structure.
- Array of radiators
On any structure, orientation to incoming signal also equals to how EM radiation leave that structure and this is compounded when there are many structures in close proximity to each other.
Effective control of all three item is crucial to control of total RCS. Not reduction but control because reduction falls under control.
What make the J-20's canards suspicious to aviation experts everywhere falls under item 'Array of radiators'. Not the canard itself as a standalone structure but the canards
ON THE J-20. Do you understand?
On a complex body, the greater the protrusion of a contributing member into free space, meaning more of it is exposed to the incoming wave, the greater its prominence under data analysis. That is why the first control rule is to control the 'Quantity of radiators'. If you must have a certain structure, meaning you cannot fly without it, then you must apply the next two control rules.
The F-22's wings were precisely designed in terms of shape, dimensions, and relationship to nearby structures such as fuselage and rear horizontal stabs. The canards on the J-20 are suspicious precisely because of what they are supposed to do. If you change its shape and/or dimensions in anyway, you affect its contributions to aircraft lift and maneuverability. Chinese aerodynamic experts on the J-20 know this. So do aerodynamic experts around the world.
The B-2's design as a flying wing allows the exclusion of the vertical stabs, which reduces overall RCS under the rules control of 'Quantity of radiators' and 'Array of radiators'.
The F-22's design as an agile fighter necessitate the inclusion of the vertical stabs, which increases overall RCS under the rules control of 'Quantity of radiators' and 'Array of radiators'.
The J-20's design as an agile fighter necessitate the inclusion of the canards, which aviation experts believes will increase overall RCS under the rules control of 'Quantity of radiators' and 'Array of radiators'. Not counting the vertical stabs and the ventral fins, which also falls under the same rules.
That is why it is ridiculous for you to compare the J-20's 'Small canard' against the F-22's 'Giant canard' and that was why I made fun of you. Look at your own illustration. The F-22 is clearly the superior complex body in terms of those three control rules.
But hey...This is real physics but the J-20 falls under 'Chinese physics' here...
![Rolleyes2 :rolleyes: :rolleyes:](/styles/default/xenforo/smilies/rolleyes2.gif)