j20blackdragon
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Here's my guess.
1. The J-20 is a large interceptor/striker powered by the WS-15 (and AL-31FN Series 3 as an interim solution). The J-20 will be flying at supersonic speeds at high altitudes in a straight line. It doesn't matter what engines it's using. Thrust to weight ratio only matters if you maneuver in a dogfight and slow down.
2. The FC-31 is a purely export plane like the FC-1, powered by RD-93. The PLAAF has never operated any planes with the RD-93, so why would they begin now?
3. This silver J-XX is the real stealth fighter. If Deino's size estimate is correct and this mystery fighter is about the same size as the F-22, that would make it perfect for WS-10. Virtually all of the PLAAF's fighter aircraft (Flanker clones and J-10 family) use the WS-10. It would make logistical sense to also have the stealth fighter use the same engine.
1. The J-20 is a large interceptor/striker powered by the WS-15 (and AL-31FN Series 3 as an interim solution). The J-20 will be flying at supersonic speeds at high altitudes in a straight line. It doesn't matter what engines it's using. Thrust to weight ratio only matters if you maneuver in a dogfight and slow down.
2. The FC-31 is a purely export plane like the FC-1, powered by RD-93. The PLAAF has never operated any planes with the RD-93, so why would they begin now?
3. This silver J-XX is the real stealth fighter. If Deino's size estimate is correct and this mystery fighter is about the same size as the F-22, that would make it perfect for WS-10. Virtually all of the PLAAF's fighter aircraft (Flanker clones and J-10 family) use the WS-10. It would make logistical sense to also have the stealth fighter use the same engine.