Patent ID: 9689373
Date: 2017-06-27
CPC Classifications: F03D,F05B,Y02E

Claim:
1. A structure for converting wind energy into rotational mechanical energy comprising: a rotary solid structure mounted on a rotatable axle; a pocket-like sail formed from flexible material comprising a pocket bottom edge and a pocket opening edge defining a pocket opening; a spar-like structure with first and second ends; wherein the first end is attached at a midpoint of said pocket opening edge and the second end is attached to said rotary solid structure opposite said pocket opening edge for maintaining an open pocket along said pocket opening edge; wherein said pocket bottom edge is attached to said rotary solid structure near an outer rim thereof; and wherein said pocket-like sail billows outwardly when the pocket opening is in a windward position and does not totally collapse when said pocket bottom edge is in a windward position.