This safety sheet compiles safety precautions on handling, using, and disposing hub blade.

本说明书编写操作、使用和处理集线器刀片的安全预防措施。

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These turbines are equipped with a number of new features: an optimized blade design with a spoiler extending down to the hub, and a pre-cast concrete base.

这些风机有很多新特征，一种优化的叶片设计，带有后部的襟翼向轮毂扩展，预浇注的混凝土基础。

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Rotor design is comprised of some factors such as hub configuration, blade number, rotor diameter, rotor solidity and airfoil which have effects on helicopter performances.

旋翼设计包括桨毂构型、旋翼桨叶片数、旋翼直径、旋翼实度、翼型剖面等一系列影响直升机性能的因素。

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