ch-1 is the first member of the rainbow (ch) series uav. the general designer was mr. shi wen (石文), who is also the general designer of ch-2, the successor of ch-1, casc pw-1, the derivative of ch-1, and casc pw-2, the derivative of ch-2. ch-1 program first begun in 2000, and the success of ch-1 resulted in the establishment of uav program which eventually led to other designs that followed. ch-1 is mainly intended for reconnaissance and surveillance missions. specification: