Katsoin, mitä google tarjoaa
http://www.quora.com/Stealth-Techno...lthy-as-the-Russians-claim-or-stealthy-at-all
The PAK FA isn't all that stealthy, but it was designed to be so. I remember reading a discussion in a forum once, and it was said that the RCS (
Radar cross-section) should be around ~0.5m^2.
I believe the Russians have purposely traded extreme VLO characteristics for better maneuverability, and lower construction & maintenance costs of the aircraft.
In a way, this is actually a brilliant design. The trick here is that the PAK-FA will have L-band radars in the leading edges of it's wings, so it would be able to detect enemy stealth aircraft (designed to be stealthy in the X-band) without much difficulty, at sufficiently long distances.
This is similar to the kind of long wavelength radar that was used in the 1999 shooting down of the "stealth" F-117A.
So basically, the Russians reduced the signature of the aircraft as much as was technically feasible, while still keeping extreme maneuverability and low unit purchase cost.
In-spite of its larger RCS however, it should theoretically still be able to detect the enemy stealth aircraft at about the same time they detect it, by making use of L-band radars.
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SU-35 RCS on ilmeisesti selkeästi korkeampi (Su-27 lienee ollut selkeästi yli 10m2, josta on sitten jonkun verran päästy alas).
On ihan ymmärrettävää, että on haluttu kehittää uusi kone. Vanhan peruskonstruktion rajat tulevat kuitenkin joskus vastaan.
Nythän on joka tapauksessa käymässä niin, että Pak-fa on laitettu hyllylle, ja Venäjä tilaa nimenomaan SU-35.