Abstract: A bicycle hub having a fluid automatic transmission receiving power input from the rider which uses drag to transfer power from an outer shell being rotated by the drive train to a stator and using applied torque to automatically control mechanical advantage in a limited manner by changing drag, this with flow restriction to limit the amount of shear possible thus the device is a fluid couple with torque-converter qualities. The ability to respond to torque in a way that changes mechanical advantage in a manner that the rider considers normal bicycle operation over varied terrain is what makes the device a fluid automatic bicycle transmission. The apparatus is appropriate to small and fractional horsepower applications in general.

Abstract: A bicycle hub having a fluid automatic transmission receiving power input from the rider which uses drag as the means to transfer power from an outer shell being rotated by the drive train to a stator and using applied torque to automatically control mechanical advantage in a limited manner by changing drag, this with flow restriction to limit the amount of shear possible thus the device is a fluid couple with torque-converter qualities. The ability to respond to torque in a way that changes mechanical advantage in a manner that the rider considers normal bicycle operation over varied terrain is what makes the device a fluid automatic bicycle transmission, an invention appropriate to small and fractional horsepower applications in general.

Abstract: A fluid automatic transmission for bicycles and other human powered vehicles that dynamically regulates torque thus changing mechanical advantage for the rider or engine. Similar in principle to using an automotive torque-converter that is never locked-out, the design is unique in applying that concept to the bicycle drive train.