Su-27 Flanker Family Variants

* Soviet-era Su-27 variants and derivatives include:

T10 ("Flanker-A"): Initial prototype configuration.

T10S: Improved prototype configuration, more similar to production spec.

Su-27S (Su-27 / "Flanker-B"): Initial production single-seater. The "T10P" designation is sometimes used for Su-27S single-seaters stripped of secondary strike capability.

Su-27UB ("Flanker-C"): Initial production two-seat operational conversion trainer.

Su-27SK: Export Su-27 single-seater.

Su-27UBK: Export Su-27UB two-seater.

Su-27K (Su-33 / "Flanker-D"): Carrier-based single-seater with folding wings, high-lift devices, and arresting gear, built in small numbers. They followed the "T10K" prototypes and demonstrators.

Post-Soviet era variants and derivatives include:

Su-27P: Single-seat demonstrator with improvements such as inflight refueling probe.

Su-27PU (Su-30): Two-seat limited production machine with improvements such as inflight refueling probe, fighter direction avionics, new flight control system, and so on.

Su-30M / Su-30MK: Next-generation multirole two-seater. Apparently a few Su-30Ms were built for Russian evaluation in the mid-1990s, though nothing much came of the effort. The Su-20MK export variant was embodied as a series of two demonstrators of different levels of capability.

Su-30MKI: Substantially improved Su-30MK for the Indian Air Force, with canards, vectored-thrust engines, new avionics provided by several nations, and multirole capability.

Su-30MKK: Su-30MK for the Chinese air force, with updated Russian-built avionics and multirole capability, but no canards or thrust-vectoring engines. The Chinese navy also bought similar "Su-20MK2" machines with enhanced antishipping attack capabilities.

Su-30MKM: Su-30MK for Malaysia.

Su-30KI: Improved single-seater with Su-30MK features for Indonesia deal that fell through, following in the steps of an "Su-27SMK" evaluation aircraft flown in the mid-1990s.

Su-27M (Su-35, Su-37): Series of improved demonstrators for an advanced single-seat multirole Su-27S derivative. The series also included a two-seat "Su-35UB" demonstrator.

Su-27SM: Upgraded Russian Su-27S, featuring technology evaluated in the Su-27M demonstrators.

Su-27UBM: Comparable upgraded Su-27UB two-seater.

Su-32 (Su-27IB): Two-seat dedicated long-range strike variant with side-by-side seating in "platypus" nose.

Su-27KUB: Essentially an Su-27K carrier-based single-seater with a side-by-side cockpit, for use as a naval carrier trainer or multirole aircraft.

Source: Vectorsite.net