Shown is the element that makes the Su-57 fighter "invisible"

A photo of the coaxial-radial grille of the Su-57 fighter was published online - this is the element that makes

the plane is "invisible".

Or, to be more precise, coaxial-radialthe grille reduces the fighter's radar signature. It is noted that this element is shown for the first time. The coaxial radial grating is made of radio-absorbing materials. The task of the element is to hide the direct radar radiation from the inlet of the engines.