| 摘要 |
<p>A marine ring propeller comprising blades, each having parallel edges and a constant cross-section, and a ring in the form of an annular shroud fixed to the outer ends of the blades. The shroud is typically frusto-conical on its inner surface and curved on its outer surface to provide an aerofoil cross-section, apart from the leading edge which is provided with alconcave bevel on either or both of the inner and outer surfaces.</p> |
