J-20 5th Gen Fighter Thread VI

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Iron Man

Major
Registered Member
Ughhh, The abstract Klon posted is a description of RAM or Radar Absorbing Material not the recent Buzz word Meta-material.
Meta-material is a 3 Dimensional shape that does not occur in nature which has special properties.
Not only that, there is no mention of which part of the EM spectrum this RAM performs best against, since the claimed range is all the way from below HF band all the way up to V band. This range encompasses every last band that is used for military radar applications. The chance that this RAM is equally effective against all the bands in this range is right around zero. Most likely it is designed to maximize attenuation vs the higher end bands, as would be expected from just about any other RAM material developed so far.
 

latenlazy

Brigadier
Ughhh, The abstract Klon posted is a description of RAM or Radar Absorbing Material not the recent Buzz word Meta-material.
Meta-material is a 3 Dimensional shape that does not occur in nature which has special properties.

As for your posting;


This is just techno gibberish.
Whether natural occurring structure or meta-material structure it all has a natural resonating frequency. With out some kind of outside source of energy you can't change frequency of a wave which you are suggesting.
The closest thing you suggest is Smart Skin technology that Japan is doing research in which they vibrate the outer skin of a plane with plasma to emit or cancel out low energy radar just like sound cancellation system you see in ear phones these days.
Actually, a more precise definition of metamaterials is that they are any kind of material whose properties are dependent on the structural arrangement and configuration of their constituent elements, and not simply the natural properties of the material’s composition. Metamaterials that are engineered for electromagnetic effects are only a subset of all metamaterials, and of those the ones that operate by principles of reflection are themselves yet a smaller subset. Metamaterials that are engineered for electromagnetic effects can also operate by principles of absorbption, emission, and conduction. Taxiya isn’t speaking techno babble gibberish. You’re just demonstrating a very superficial grasp of the subject. You should be more thorough in your research (at least read a basic
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) before trying to sound so matter-of-fact.
 

Iron Man

Major
Registered Member
I will save my time as @Klon just answered your fixation of UHF/VHF or whatever frequency you are trying to nit-pick. It is a moot concern, and you just try to hang on to it to avoid that you missed or ignored or not knowing something.
Hey, I have an idea: why don't you go and have your own conversation with your imaginary friend about metamaterials, since it should now be obvious to everybody, even yourself, that what you are talking about has literally nothing to do with what plawolf and I were talking about when you decided to insert yourself into the conversation.
 

Air Force Brat

Brigadier
Super Moderator
He said that he first heard about J-20's weight in 2006 and that it was supposed to be heavier than the F-22 and lighter than the SU-27. Ten years have passed and the current situation is unclear. He also later discovered that there were discrepancies regarding F-22's statistics by the Chinese intelligence and that there are problems with F-22's weight data.

There's no tangible reason to dispute that information, I think the F-22s weight brings no suprises based on actual measurements, it is indeed a meter or two shorter than the J-20...

The Su-27 has always been a heavy fighter by design, so its no surprise that it would weigh more than the J-20.
 

latenlazy

Brigadier
There's no tangible reason to dispute that information, I think the F-22s weight brings no suprises based on actual measurements, it is indeed a meter or two shorter than the J-20...

The Su-27 has always been a heavy fighter by design, so its no surprise that it would weigh more than the J-20.
The F-22 ended up being much heavier than the Flanker. If the J-20 is lighter than the Flanker then it’s also lighter than the F-22. External appearances aren’t everything.
 

manqiangrexue

Brigadier
There's no tangible reason to dispute that information, I think the F-22s weight brings no suprises based on actual measurements, it is indeed a meter or two shorter than the J-20...

The Su-27 has always been a heavy fighter by design, so its no surprise that it would weigh more than the J-20.
So J-20 is heavier than the 19.7 ton F-22 and lighter than the 16.4 ton Su-27? No reason to think there's something wrong with that statment? This is the extent of your knowledge on aircraft? LOLOL Impressive as always!
 

mys_721tx

Junior Member
Registered Member
So J-20 is heavier than the 19.7 ton F-22 and lighter than the 16.4 ton Su-27? No reason to think there's something wrong with that statment? This is the extent of your knowledge on aircraft? LOLOL Impressive as always!

I believe that the source is saying that J-20 was designed under the impression that F-22 would be lighter than Su-27; They were able to make J-20 lighter than Su-27 but were unable to reach the presumptive weight of F-22; And they later found out that F-22 is heavier than Su-27.
 

manqiangrexue

Brigadier
I believe that the source is saying that J-20 was designed under the impression that F-22 would be lighter than Su-27; They were able to make J-20 lighter than Su-27 but were unable to reach the presumptive weight of F-22; And they later found out that F-22 is heavier than Su-27.
LOL I know exactly what that source was saying; someone else doesn't and went, "Well there you go! I totally agree; J-20 should be heavier than F-22 as stated and both are lighter than the massively long and heavy Su-27! Makes perfect sense!" without understanding the fact that Su-27 is much lighter than F-22. And he did that because he saw, "...J-20 heavier than F-22..." and since that's exactly what he had been longing to hear, he knee-jerked and agreed whole-heartedly with the statement without thinking about it or fact-checking its other parts. There's nothing wrong with the source or what it was actually conveying; it's his interpretation that's hilarious.
 
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latenlazy

Brigadier
Whether natural occurring structure or meta-material structure it all has a natural resonating frequency. With out some kind of outside source of energy you can't change frequency of a wave which you are suggesting.
I wanted to follow up on this particular bit. The bolded claim is wrong. You can. Metamaterials can be designed specifically to shift the frequency of the EM radiation it absorbs, and even to be tunable. That’s the whole point of a metamaterial.
 
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