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The Main rotor attach nut, or "Jesus nut", from a Bell 222U, shown in hand for size perspective (left) and installed with locking key (right). Jesus nut is a slang term for the main rotor retaining nut [1] or mast nut, which holds the main rotor to the mast of some helicopters.
The helicopter rotor is powered by the engine, through the transmission, to the rotating mast. The mast is a cylindrical metal shaft that extends upward from—and is driven by—the transmission. At the top of the mast is the attachment point (colloquially called a Jesus nut) for the rotor blades called the hub
The rotorhead is connected to the main drive shaft via the Jesus nut, and houses several other components such as the swash plate, flight control linkages and fly-bars. [ 1 ] The rotor hub is also where the centre of gravity acts on the helicopter.
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The Jesus nut, also called the Jesus pin, is the nut that holds the main rotor to the mast of some helicopters, such as the UH-1 Iroquois helicopter. It is a slang term that maybe was first coined by American soldiers in Vietnam; the technical term is main rotor retaining nut.
Airflow through a helicopter rotor. Above, the rotor is powered and pushing air downward, generating lift and thrust. Below, the helicopter rotor has lost power, and the craft is making an emergency landing.
His hair is of the colour of the ripe hazel-nut, straight down to the ears, but below the ears wavy and curled, with a bluish and bright reflection, flowing over his shoulders. It is parted in two on the top of the head, after the pattern of the Nazarenes. His brow is smooth and very cheerful with a face without wrinkle or spot, embellished by ...
Bell 204B height–velocity diagram, showing the unsafe region on the left, due to insufficient airspeed for autorotation, the takeoff profile, and the unsafe region on the lower right due to limited pilot reaction time.