One-way bearing

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The one-way bearing (or freewheeling unit as it is more commonly known in full size aviation) is the central bearing in the main gear assembly, that allows the main gear (and the tail drive gear / pulley) to spin freely in the event of the engine or motor stopping. When under power, the one-way bearing locks the gear and shaft together so they spin as one. This allows the main rotor to spin freely during autorotation while still driving the tail rotor so tail control authority is maintained throughout the auto.

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