Check out these Helicopter transmission images:

Marine Week Boston, 2010: Bell AH-1W SuperCobra attack helicopter taking off from Boston Common, kicking up a huge cloud of dust & debris

Image by Chris Devers
Pasting from Wikipedia about the AH-1 SuperCobra helicopter:

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The AH-1 Cobra (company designation: Bell 209) is a two-bladed, single engine attack helicopter manufactured by Bell. It shares a common engine, transmission and rotor system with the older UH-1 Iroquois. The AH-1 is also referred to as the HueyCobra or Snake.
The AH-1 was the backbone of the United States Army‘s attack helicopter fleet, but has been replaced by the AH-64 Apache in Army service. Upgraded versions continue to fly with the militaries of several other nations. The AH-1 twin engine versions remain in service with United States Marine Corps as the service’s primary attack helicopter. Surplus AH-1 helicopters have been converted for fighting forest fires. The United States Forest Service refers to their program as the Firewatch Cobra. Garlick Helicopters also converts surplus AH-1s for forest firefighting under the name, FireSnake.[2]

[…]

The Bell AH-1 SuperCobra is a twin-engine attack helicopter based on the US Army’s AH-1 Cobra. The twin Cobra family includes the AH-1J SeaCobra, the AH-1T Improved SeaCobra, and the AH-1W SuperCobra. The AH-1W is the backbone of the United States Marine Corps‘s attack helicopter fleet, but will be replaced in service by the AH-1Z Viper upgrade in the next decade.

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Marine Week Boston, 2010: Bell AH-1W SuperCobra attack helicopter taking off from Boston Common, kicking up a huge cloud of dust & debris

Image by Chris Devers
Pasting from Wikipedia about the AH-1 SuperCobra helicopter:

• • • • •

The AH-1 Cobra (company designation: Bell 209) is a two-bladed, single engine attack helicopter manufactured by Bell. It shares a common engine, transmission and rotor system with the older UH-1 Iroquois. The AH-1 is also referred to as the HueyCobra or Snake.
The AH-1 was the backbone of the United States Army‘s attack helicopter fleet, but has been replaced by the AH-64 Apache in Army service. Upgraded versions continue to fly with the militaries of several other nations. The AH-1 twin engine versions remain in service with United States Marine Corps as the service’s primary attack helicopter. Surplus AH-1 helicopters have been converted for fighting forest fires. The United States Forest Service refers to their program as the Firewatch Cobra. Garlick Helicopters also converts surplus AH-1s for forest firefighting under the name, FireSnake.[2]

[…]

The Bell AH-1 SuperCobra is a twin-engine attack helicopter based on the US Army’s AH-1 Cobra. The twin Cobra family includes the AH-1J SeaCobra, the AH-1T Improved SeaCobra, and the AH-1W SuperCobra. The AH-1W is the backbone of the United States Marine Corps‘s attack helicopter fleet, but will be replaced in service by the AH-1Z Viper upgrade in the next decade.

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Marine Week Boston, 2010: Bell AH-1N SuperCobra attack helicopter’s Arabic “Star” logo — anyone able to translate this?

Image by Chris Devers
Pasting from Wikipedia about the helicopter:

• • • • •

The AH-1 Cobra (company designation: Bell 209) is a two-bladed, single engine attack helicopter manufactured by Bell. It shares a common engine, transmission and rotor system with the older UH-1 Iroquois. The AH-1 is also referred to as the HueyCobra or Snake.
The AH-1 was the backbone of the United States Army‘s attack helicopter fleet, but has been replaced by the AH-64 Apache in Army service. Upgraded versions continue to fly with the militaries of several other nations. The AH-1 twin engine versions remain in service with United States Marine Corps as the service’s primary attack helicopter. Surplus AH-1 helicopters have been converted for fighting forest fires. The United States Forest Service refers to their program as the Firewatch Cobra. Garlick Helicopters also converts surplus AH-1s for forest firefighting under the name, FireSnake.[2]

[…]

The Bell AH-1 SuperCobra is a twin-engine attack helicopter based on the US Army’s AH-1 Cobra. The twin Cobra family includes the AH-1J SeaCobra, the AH-1T Improved SeaCobra, and the AH-1W SuperCobra. The AH-1W is the backbone of the United States Marine Corps‘s attack helicopter fleet, but will be replaced in service by the AH-1Z Viper upgrade in the next decade.