| 摘要 |
Known underwater turbine units suffer from problems, e.g. an ability to operate in ebb and/or flow tides. Accordingly, the invention provides aerofoil ( 5 ), wherein the aerofoil ( 5 ) is symmetrical about a mid-chord line (A) thereof. The aerofoil ( 5 ) may be symmetrical about a chord (B) thereof. The underwater turbine unit ( 3 ) comprises at least one turbine ( 25 ) which comprises at least one blade ( 20 ) which comprises the aerofoil ( 5 ).
|
