What is the asymmetric feature on the rear of a Sukhoi Su-47? I saw this part on the rear of the Sukhoi Su-47 Berkut, and I can see that it is asymmetric. Is it maybe for interference, or is it a take-off aid because the Su-47 is a STOL plane?

What is it and why is it asymmetric?



Edit:Second picture is mirrored
The Su-47 has two tailbooms of unequal length outboard of the exhaust nozzles. The shorter boom, on the left-hand side, houses rear-facing radar, while the longer boom houses a brake parachute.


Source: Wikipedia

Related: What is this part between the Su-35&#39;s jet exhaust nozzles?

Note: Your second image is mirrored. Here's a real photo with the right (starboard) boom being the longer one:


  
  Su-47 (aka S-37) in lead, also notice the tail numbers of the formation (no mirroring); source: wikimedia.org