 The Cobra shared the proven transmission, rotor system, and the T53 turboshaft engine of the UH-1 "Huey".By June 1967, the first AH-1G HueyCobras had been delivered.Originally designated as UH-1H, the "A" for attack designation was soon adopted and when the improved UH-1D became the UH-1H, the HueyCobra became the AH-1G.