I have to save this for the readers to see...
A long time ago, we have a Chinese member who claimed to be a university/college level professor in physics boldly asserted that the 10-lambda rule violate Born Approximation. He provided no credible scientific sources to support that assertion.
For interested readers, basically, Born Approximation (keyword search) is about 'guessing' the total amount of scattering radiation from a body based upon known energy level from a source, such as a radar antenna. To say that something violate the laws of physics is to say that such a thing cannot exist. It is made up. It is magic. Therefore, according to this Chinese member who claimed to be a physics professor, the 10-lambda rule is a made up rule. A Western magical invention.
Let us see what real Chinese engineers have to say about the 10-lambda rule...
Note what these real Chinese engineers said:
When the geometric dimension of an object is large enough (>10 λ, the quantity of the creeping wave on the backward direction can be neglected.
λ = lambda, which represent wavelength. Any wavelength. The highlighted say: greater than 10 wavelengths, aka the 10-lambda rule...
- If the diameter of a sphere/cylinder is greater than 10-wavelengths, then the creeping wave behavior will not exist.
- If the diameter of a sphere/cylinder is less than 10-wavelengths, then the creeping wave behavior will exist.
I have been out of aviation for a long time, approaching 15 yrs. I used to be able to do radar range calculations in my head out in the field. But even though I am one of those guys that if I do not use it, I will lose it, I do not forget the foundations of what I discard through lack of use of the tools. No one can. The math is the tools and they have gotten more complex over the years through new discoveries but the fundamentals remains.
The 10-lambda rule is
FUNDAMENTAL in how to design a finite body with controls of scattering mechanisms in mind, specifically of cylinders and half spheres on an aircraft. In other words, in how to design a low radar observable, aka 'stealthy', body, the 10-lambda rule is why missiles are enclosed inside the fuselage, why there are exaggerated curvatures on the B-2, F-22, F-35, and finally the J-20. The last is a Chinese product.
And yet we have on this forum a Chinese member who claimed to be a physics professor asserted that the 10-lambda rule is solely a Western construct. We can only wonder what senors Jinkui Yan, Changlong Xu, and Deming Xu, of Shanghai University, thinks of this assertion. May be these three gents do not exist? Neither does the 'Asia Pacific Microwave Conference'? Neither does Shanghai University?
NOW we have another Chinese member who asserted that EM transmissions from EW systems will kill the user. This man have no military experience and clearly no relevant technical experience. And he says that EW warfare is basically suicidal in nature:
death from self created radiation.
Who can refute this? No one can. No one should even try. These two gems, and there are plenty more, are prime examples of the old advice about arguing with fools who drags you down to their level and beat you with their experience. Or in this case -- lack of.