SU-27 UB Flander C is a double-seat coach fighter type researched and developed by Soviet sukhoi design bureau. It is with double-seat cockpit, the two front and back cockpits are with one piece cockpit cover, The fighter is 21.94m long, 6.36m high, wingspan 14.7m. The equipment of SU-27UB Flanker C makes it able to dight, so the coach fighter is fitted with complete weapons and fire force control ssytem including radar. In 96 China Airshow Zhuhai. The splended performance of "Cobra" and acrobat wins audience's claps and appluds, fully shows its high performance.