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SAC FC-31 Stealth Fighter: News & Discussions

But bro i don't like plan-form alignment of J-20 with carnad and ventral fins which gives extra surfaces to radars, but design of FC-31 is more mature than J-20:angel: as for engines upgraded WS-13E with a thrust of 22000+ should fit the bill:angel:

What is the time duration b/w v1 and v2, as far as i remember it was almost 3 years:undecided:
Was it small ? :-)

No, it is not.

There will always be situations where BVR engagements are not possible, such as ROE that requires visual IDs of the target(s).


True, but take the infantryman for example.

Did the advent of the rifle, which increase the range of lethality he can deliver, do away with close quarters combat ? Urban situations is where both visual IDs of the target negate the rifle's long reach.


There are three major rules in designing a low radar observable body:

- Control of quantity of radiators
- Control of array of radiators
- Control of modes of radiation

These are not rules that you can break, rather, they are more like guidelines where you have degrees of obedience to them.

Why is the sphere the ideal body for radar calibration ?

The reason the sphere is the ideal 'stealth' body is because the sphere is the most obedient to the three rules.

- Control of quantity of radiators

The sphere have only one radiating body -- itself.

- Control of array of radiators

The sphere have none. It has no protrusions where each structure is a radiator and whose radiation can interact with radiation from other structures.

- Control of modes of radiation

The sphere have only two modes of radiation: specular and surface waves.

http://www.centurymetalspinning.com/radar-calibration-spheres/

There is one in orbit...

https://en.wikipedia.org/wiki/Lincoln_Calibration_Sphere_1

When we put all three rules together and apply it to the sphere, there can be a sphere that is visually large but electromagnetically small or 'stealthy'. In other words, you can see the sphere with your own eyes but your radar will not see the sphere with its own EM radiation.

A structure like a fin have at least three modes of radiation: specular, edge diffraction, surface waves.

For example...

keller_cone_01_zps7b1c9569.jpg


This means you want to minimize the QUANTITY of these structures as much as possible. Unfortunately, today's aircrafts still needs structures like the fin to have controlled flight. So if you must have these structures, you move to rule Two: Control of ARRAY of radiators.

Since these structures are in proximity to each other, interactions from their radiation are inevitable. Each mode of radiation have different levels of strength and power. Each interaction, aka 'interference', can be destructive ( good ) or constructive ( bad ). Destructive interference cancels each other out. Constructive interference amplifies. This is what rule two means by 'array of radiators'. Whether a fin is vertical or not, depending on your viewing angle, is not the point. What is that fin's physical relationships to nearby structures -- is the point.

The bottom line is that the greater the quantity of radiators, the more difficult it is to predict interference incidents and to compensate for them.

This is why the J-20 is suspect regarding comparison to the F-22 in terms of all aspects RCS. Suspect as in having a higher total RCS.
You just put my recently learned physics to application :-(
 
the pt-3 will have 6 bays as said on afm. on a single bay you can fit 2x500lb bombs
To admit I'm more than sceptical concerning this statement: IMO that type is simply too small to have the same PL-10-bay on the side and even more two more bays than the J-20, which is not a small fighter.

Another reason I don't believe these rumours is that - again IMO - it is unlikely to develop a demonstrator (aka 31001), the fly a dramatically modified version V2 three years later and then redesign that type again so much. IMO highly unlikely.

Deino
 
To admit I'm more than sceptical concerning this statement: IMO that type is simply too small to have the same PL-10-bay on the side and even more two more bays than the J-20, which is not a small fighter.

Another reason I don't believe these rumours is that - again IMO - it is unlikely to develop a demonstrator (aka 31001), the fly a dramatically modified version V2 three years later and then redesign that type again so much. IMO highly unlikely.

Deino
Like i said earlier , the one we are expecting could be another v2 unit but full version with EOTS and single canopy and possibly different engine
 
Like i said earlier , the one we are expecting could be another v2 unit but full version with EOTS and single canopy and possibly different engine
... :tup: exactly, but IMO highly unlikely an "enlarged" one with WS-10X or structurally different to V2 by including four more weapon bays.
 
... :tup: exactly, but IMO highly unlikely an "enlarged" one with WS-10X or structurally different to V2 by including four more weapon bays.
WS-10 is not an option for this small airframe . Btw , did anyone even rumour on 4 bays yet ? :o::o:
 
WS-10 is not an option for this small airframe . Btw , did anyone even rumour on 4 bays yet ? :o::o:
As far as I know there was always only one large or at best one divided center-bay. As such I really don't know where this rumour of 6 bays is from and even more where to fit them.

No current fifth generation fighter has so many.
 
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