VicPol Viper. This was the first purpose-designed attack helicopter. The single-engined AH-1G was progressively developed into the twin-engined AH-1J and AH-1T SeaCobras, and AH-1W SuperCobra. The AH-1Z Viper represents a generational leap in the Cobra family with the introduction of upgraded engines and electronics, a bearing-less, rigid four-blade composite main rotor, and a four-blade tail rotor.