... 气垫船 hovercraft 毂比 hub ratio 船体几何 hull geometry ...
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轮毂比 hub ratio ; hub-tip ratio ; tip hub ratio ; boss ratio
叶轮轮毂比 impeller hub ratio
毂径比 boss ratio ; boss diameter ratio
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由于60纳米的扭矩，这种自行车比典型的安装了电动旋翼叶毂发动机的自行车有更多动力。
With 60Nm of torque, the bike has a lot more grunt than a typical electric hub-motor installed in bicycles.
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