| 摘要 |
A ceiling fan blade is disclosed that is twisted rather than flat and has a graduated dihedral. The dihedral is provided for a wider distribution of divergence of air in the space beneath the fan. The blade ( 10 ) is demarked to have three sections which include a mounting section ( 11 ) and two airflow sections ( 12 ) and ( 13 ). The two airflow sections ( 12 ) and ( 13 ) are twisted with the rate of twist from the root end to the tip end being nonuniform. The twist or ratio of the degree increase in the angle of attack over each inch in length deceases from root end to the tip end.
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