Nose Radar Installation
Wing Leading Edge Arrays
Optical/IR Search and Track
We now have a report that they have run up the engines in the prototype and taxied:
The first prototype of the aircraft rolled out on the runway of KNAAPO aircraft plant in Komsomolsk-on-Amur in the country’s far east. The test pilot switched on its engines and made two runs on the airstrip, during which breaks were applied several times.
The report says that they expect to field the aircraft in 2015, but my guess is that this is either a deliberate deception, or self delusion.
We are still getting conflicting reports on just what the aircraft is like, though this story reports a 3,500 km range, which I assume refers to ferry range, and is roughly equivalent to that of the F-22, for which the Wiki quotes a 2,000 mi (3,219 km) range.
Assuming that this is the case, I would assume that the PAK-FA is a bit smaller than the F-22, since the Russians tend to have internal fuel tanks which are not rated at the aircraft’s full performance (the equivalent of a internal “external tank”), as they are doctrinally less inclined to use either external tanks or aerial refueling.
One thing that is almost certain though: That its missiles will have superior kinematics to the AMRAAM/AIM-9Z used by the Raptor. The current Russian missiles are larger and heavier than the American loadout, and larger missiles=larger motors=longer range and better terminal performance.
Also, my guess is that the Russians are going “stealth lite”, with a greater reliance on sensors and missile kinematics, as opposed to all aspect stealth.
The photos from the Wiki, show a larger AESA radar array (top pic), wing leading edge mounted arrays for better off-axis performance (middle pic), and an Optical/IR Search and Track (bottom pic) for passive, or 3rd party designated, engagement of targets.
My guess is that the missiles will be mounted conformally, as opposed to internally, because the associated weight of internal carriage of larger missiles would very likely prove prohibitive.
But those are just my not-particularly-educated guesses, and we have to wait for the first blurry photos to be leaked to Aviation Week & Space Technology.