offset hinge

A helicopter main rotor hinge at a substantial distance from the axis of rotation. As compared with flapping hinges, offset flapping hinges provide better longitudinal and lateral stability and a wider center of gravity limits and permit the helicopter to go faster in forward flight.
In the above design, the flapping hinges are located well away from the hub, which appears as a large T and is being used as a mast.

Aviation dictionary. 2014.

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