| 摘要 |
PURPOSE: A propeller is provided to ensure improved mechanical strength because the blade shoe is extended over two or more planes. CONSTITUTION: A propeller comprises a central support(1) and two or more propeller blades(5) which are fixed around the support. The transverse section of the propeller blades gets narrower as the radial interval from the support increases. Each blade is fixed to the support with a blade shoe(10) which surrounds the blade and is screwed to the support. One blade shoe is divided into two shoe parts.
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