@hxshi.fx: The Su-27LL-PS (or Su-27LL-UV(PS)) was an experimental flight laboratory platform based on the Su-27UB trainer, used in the early 1990s to test 2D thrust-vectoring nozzles. It featured a distinctive, large, flat, two-dimensional nozzle on one engine, designed to evaluate thrust vector control (TVC) technologies, often linked to bomber development programs. . . . Key details about the Su-27LL-PS: Designation: Stands for Letayushchaya Laboratoriya - Ploskoye Soplo (Flying Laboratory Flat Nozzle) or Upravlyayemy Vektor Tyagi Ploskoye Soplo (Thrust Vector Control Flat Nozzle). Purpose: The aircraft, specifically a modified Su-27UB (often identified as '08' from Irkutsk), was used for testing 2D vectoring technology. Configuration: It was a testbed, not a production fighter, frequently fitted with an asymmetric nozzle setup to test 2D thrust vectoring. Origin: Trials were conducted in the early 1990s at the Zhukovsky test center under the direction of TsIAM and Saturn/Lyulka OKB. It was part of a broader series of Su-27 modification tests aimed at improving maneuverability and control. . #sukhoi #su27 #su27flanker #experimentalfighter #fyp

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