US PATENT SUBCLASS 416 / 12
.~.~ Responsive to folding or feathering of flow-aligned vane

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

9  DF  WITH MEANS POSITIONING FLUID CURRENT DRIVEN IMPELLER RELATIVE TO FLOW DIRECTION {2}
10  DF  .~ Offset relative to flow direction {3}
12.~.~ Responsive to folding or feathering of flow-aligned vane

DEFINITION

Classification: 416/12

(under subclass 10) Apparatus wherein the impeller is oriented at an angle to the direction of working fluid flow in response to folding or feathering of a vane or rudder which tends to maintain a position aligned with the direction of flow.

(1) Note. The vane or rudder folding or feathering includes shifting of a substantially flat vane or rudder surface from a vertical toward a horizontal plane or varying the extent of the effective flat surface.