The Bell AH-1Z Viper: The Most Advanced Attack Helicopter on the Planet

The Bell AH-1Z Viper: The Most Advanced Attack Helicopter on the Planet. The Bell AH-1Z Viper is a twin-engine attack helicopter, based on the AH-1W SuperCobra, designed and produced by the American aerospace manufacturer Bell Helicopter. Being one of the latest members of the prolific Bell Huey family, it is also called “Zulu Cobra“, based on the military phonetic alphabet pronunciation of its variant letter.