| 摘要 |
<p>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).</p> |
