ptldM3
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A real stealth aircraft has a flat and clean lower fuselage to reduce both specular returns and diffraction.
You have no clue as to what you are talking about kid
Diffraction generally refers to EM energy when it exits off of a body such as a wing, boom, flaps, ect. Sometimes diffraction is used to describe complex behavior when EM energy strikes something such as a cavity.
Diffraction occurs when an abrupt edge or discontinuity occurs. The goal is to control this diffraction, preferably so it occurs behind an aircraft (horizontal stabs) and not in front (canards).
And please, I’m like 100% certain that you just learned the word 'specular'. Don't act like you know what you are talking.
There is no rule saying you have to have a flat fuselage to achieve 'stealth' although the flat fuselage is the simplest way that assures the least chance of any signals coming back. You can have an underside that is anything but flat, what is important is controlling and redirecting EM energy. IF you look at the F-117 it has many faceted surfaces, some in close proximity for today's standards all that faceting is not necessary but the point is the complex faceting on the F-117 caused EM energy to behave in a complex manner. The same philosophy holds true for the pak-fa.
And take a closer look at the rear lower fusalage of the B-2, flat is it?
I see gaps, seams, protrusions, surface discontinuities,
Again you have no clue as to what you are talking about, I have come across many J-20 fanboys that used the word 'surface discontinuitie' but when I ask them to explain what it means and point out these discontinuities to the readers all have shamelessly disappeared or ignored my request, which could only mean that these J-20 fanboys copied and pasted something they have no comprehension of.
So point out these surface discontinuities to everyone. There are also techniques used to reduce or eliminate this phenomenon, and I will explain it with a source but of course you first have to explain to the readers as to what surface discontinuities are and where they are found on the pak-fa.
And FYI every aircraft has surface discontinuities. And as I stated before they can be controlled so the fact that you even mentioned the subject proves that you have no idea as what you are talking about.
Quick start Googling surface discontinuities in a futile attempt to throw together a response.
As for protrusions the J-20 has many and they are quite large, I take it that you forgot to examine the J-20's wings and perhaps those nice protrusions in front of the intake so commonly referred to as DSI's.
As for seams and gaps, again you are merely looking for something to find in order to bash the pak-fa, no matter how silly it is. Even worse is that you can't back any of your claims with an in depth explanation and a source.
sudden changes in shape,
Again phrases like that only illustrates your incompetence, all aircraft have sudden changes in shape you also want to explain this particular phrase? What phenomenon are you referring to? If we take your silly phrase literally something like a vertical stabilizer is a sudden change in shape from the fuselage.
and fully exposed engines on the PAK FA.
Oh I forgot the J-20's engines are not exposed, it must be an optical elusion perhaps you are talking about the intakes, in that case Boeing must have lied when they stated that the F-15 Silent Eagle can achieve the same frontal RCS as the F-35 export model.
Did the Russians stumble onto a secret super stealth design that the rest of the world is too stupid to see? I doubt it.
Yes and many of the stupid have been concentrated in this forum most of them flying Chinese flags.