| 摘要 |
The present invention provides a prime mover ( 2 ) for harnessing energy from a flow of fluid, the prime mover ( 2 ) comprising a shaft ( 4 ) having a rotational axis, arranged to be rotatably mounted to a substructure, the shaft ( 4 ) comprising at leas one arm ( 6 ) extending radially from the shaft ( 4 ), the or each arm ( 6 ) comprising at least one blade ( 8 ) wherein the or each blade ( 8 ) is oriented such that flow action on the blade ( 8 ) effects rotation of the shaft ( 4 ), characterized in that the or each blade ( 8 ) is movably mounted on an arm ( 6 ) and wherein each blade ( 8 ) is movable from a first position, having a first drag, to a second position, having a second drag, wherein the first drag is higher than the second drag. The prime mover ( 2 ) of the invention provides substantially reduced drag in a flow of fluid, and an increased torque output, compared to prior art prime movers.
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