A new method for analyzing twin-blade fixed-pitch propeller was proposed based on the theory of corrected blade foil and aerodynamic formula of 3-d wing.
基于叶素修正理论和三维机翼气动系数计算公式，提出了一种分析双叶定距螺旋桨的新方法。
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Moshier, a former Navy-pilot-turned-entrepreneur, has spent the last five years of his life working secretly on a tiny twinblade strap helicopter called The Solotrek.
Whatever happens, Tyrion and his twin, Teclis, suffer under the curse of their forefather, brought down upon the family when Aenarion drew Khaine's blade to fight the forces of Chaos.