J-20 5th Gen Fighter Thread VIII

T

taxiya

Brigadier
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tamsen_ikard said:
Lets think what Stealth is. Its basically following the principle of a mirror. You reflect rays away from the sender by having angles that are never perpendicular. Consider taking Torch light in dark room and try to figure out a shape. That's kinda what Radar is doing.

You can basically eyeball stealth. Any planes with protruding shapes, multiple control surfaces will have higher RCS. J-20 loses stealth by having vertical stabilizers both on top and bottom. There are also overall shape alignment that seems a bit less compared to F-35. So, I think it can be reasonably guessed that J-20 has higher RCS.
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No, one can never eyeballing radar stealth. When you talk about principle of mirror you are talking about visible light. Radar stealth is far different from it because the radar waves are far longer in wave lengthes than visible light, so long that they are comparable to panels of aircraft fuselage. When such waves reach these panels and edges they DON't reflect like light on a mirror, they emits as a lamp to all directions. All those models are too low in accuracy, so they can not be used to simulate anything.
 
tphuang

tphuang

General
Staff member
Super Moderator
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If we go by that recent article of GaN-on-Sic TR modules, J-20 got a 3x range boost from going to SiC substrate.

Now, that is likely a comparison between early J-20s vs J-20A imo, because you need more power and cooling (which could only be possible through a redesign of interior (as one would expect in an upgrade as large as J-20A), more computing chips to process data (and be able decipher the weak return signals and an interior system that operates at higher voltage (Modern SiC chips would allow this) + material that has lower resistance (so less heat generated for the same amp) and leaks less power.

All of which would allow for more power to pass through without noticeable increase in losses while also not overheat the system. It would require the kind of changes you had with F-35 going from APG-81 to APG-85. Except in J-20A's case, it would have to be future proofed with cooling requirements higher than 80kW
 
B

bebops

Junior Member
Registered Member
If it has 3x range, I felt like F35 is no match against J20. Whoever gets detected first is at a severe disadvantage.

3x range and very long range bvr missile tells you which plane is better.
 
phrozenflame

phrozenflame

Junior Member
Registered Member
tphuang said:
If we go by that recent article of GaN-on-Sic TR modules, J-20 got a 3x range boost from going to SiC substrate.

Now, that is likely a comparison between early J-20s vs J-20A imo, because you need more power and cooling (which could only be possible through a redesign of interior (as one would expect in an upgrade as large as J-20A), more computing chips to process data (and be able decipher the weak return signals and an interior system that operates at higher voltage (Modern SiC chips would allow this) + material that has lower resistance (so less heat generated for the same amp) and leaks less power.

All of which would allow for more power to pass through without noticeable increase in losses while also not overheat the system. It would require the kind of changes you had with F-35 going from APG-81 to APG-85. Except in J-20A's case, it would have to be future proofed with cooling requirements higher than 80kW
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I know its slightly off-topic but I ask in context of J-20's and its weapons kill chain, can we expect similar upgrades in seekers of Pl-15 (and 17) or they would be limited by space and power generated onboard?
 
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