The Bell Model 309 KingCobra was an experimental attack helicopter developed by Bell Helicopter, based on the Bell AH-1 Cobra. == Design and development == === Background === The AH-1 Cobra was developed in the mid-1960s as an interim gunship for the U.S. Army for use in Vietnam.
The Bell Model 309 KingCobra was an experimental attack helicopter developed by Bell Helicopter, based on the Bell AH-1 Cobra. == Design and development == === Background === The AH-1 Cobra was developed in the mid-1960s as an interim gunship for the U.S. Army for use in Vietnam.
Source: Wikipedia "Bell 309 KingCobra" · CC BY-SA 4.0
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