J-20 5th Generation Fighter VII

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zbb

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taxiya said:
I think what @no_name talked about was the wing root, while you are talking about the DSI "bump". There is no professional name for it, people call it (DSI) bump.

I agree, the change to the bump is very obvious. Here is the comparison. The bump on J-20 has metal ridge in the middle. J-20S has the frame around it without the middle ridge. J-20's bump seems to be constructed as part of the fuselage, while J-20S seems to have it as an separate piece mounted.

There is also another change to the inlet lip just before the hexagon panel. In J-20S there is a black patch unpainted or uncovered. I don't know if it is a change or it is merely in a stage before being fully painted. I have never seen any J-20 in yellow primer having that.
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The small gray double hexagon behind the dragon insignia on the J-20 pic also moved to the outside of the intake below the large hexagon panel in the J-20s. Are these double hexagons covering some transmitter or receiver?
 
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taxiya

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I am not expert, can't tell for sure.
zbb said:
What are some possible reasons for the change? Is the use of composite material in that area based on stealth considerations?
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likely, it is the same treatment that all leading edges and corners are covered by grey skins. These skins likely have EM characteristic that aid absorbing incoming radio waves. IMO they are meta-materials.

zbb said:
The small gray double hexagon behind the dragon insignia on the J-20 pic also moved to the outside of the intake below the large hexagon panel in the J-20s. Are these double hexagons covering some transmitter or receiver?
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Good observation, I missed that. It must be some transceivers or sensors, otherwise it can not be easily moved from the forward fuselage to the intake tip.
 
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zbb

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Could some of the changes in use of composite materials from J-20 to J-20S (DSI and actuator bumps) be due to lower stealth requirements for the two-seat version? Enlarging the cockpit to add the second seat likely have significant adverse effects on stealth, so some of the small stealth optimizations used for single-seat J-20 may no longer makes sense economically.
 
siegecrossbow

siegecrossbow

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zbb said:
Could some of the changes in use of composite materials from J-20 to J-20S (DSI and actuator bumps) be due to lower stealth requirements for the two-seat version? Enlarging the cockpit to add the second seat likely have significant adverse effects on stealth, so some of the small stealth optimizations used for single-seat J-20 may no longer makes sense economically.
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What makes you think that the twin seater has lower stealth requirement? If anything it would be superior to the single seater since it is able to take advantage of a lot of new tech not present when the single seater’s design was frozen.
 
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