The prototype flew two of the fighter Su-9k front line (the so-called "double") is labeled "LK" (Su-11); construction began in September 1946. In terms of the basic design of equipment, assemblies and weaponry, Su-11 did not differ much from the Su-9, with the exception of the brake flap (they are not present).
Wind tunnel model studies performed using a validated facility CAHI assumption that performance can be increased subject to aviation aircraft engine nacelle on the profile is modified from the original configuration, with the engine suspended below the wing, in a symmetrical arrangement, "flush" with wings. Initially set to double up-rated RD-10 engine, but in mid-December it was decided to replace their Soviet-made TR-1 turbojet designed by AM Lyulka.
Official authorization to develop a version of the TR-1 engine is given in the USSR CM resolution in March, 11 1947 which was passed in 1947 a prototype aircraft development plans. In April 1947 the assembly is completed, and on May 11 planes were taken to the MAI FRI airfield, a team of test personnel, with pilot and engineer of GM's senior VP Shiyanov Baluyev between them, begins flight testing. On May 28, 1947 Su-11 aircraft taken from the ground for its maiden flight. Factory tests, combined with the TR-1 engine tests, completed on April 15, 1948.
Flight test report the manufacturer says that:
"1. The FP basis of the Su-11. With two TR-1 obtained during factory testing, is within design parameters.
2. Because there is no TR-1A engines available and recommendations for improving the behavior CAHI aircraft in high-speed Mach numbers because it failed to produce significant effects, we find it impractical to continue the R & D work on the aircraft. "
As a result, since April 29, 1948, Su-11 was officially deactivated.
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