The Bell AH-1Z Viper is a twin-engine attack helicopter based on the AH-1W SuperCobra that was developed for the United States Marine Corps. The AH-1Z features a four-blade bearingless composite main rotor system uprated transmission and a new target sighting system. The AH-1Z is part of the H-1 upgrade program. It is also called Zulu Cobra in reference to its variant letter.
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