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.并根据外转子无刷电动机工作原理及其特性,建立起电动无人机动力系统性能特性计算的数学模型.使用该模型分析了17组不同螺旋桨和电动机的零空速实验数据,结果表明:该模型原理正确,精度较高,且具有良好的工程操作性,能够有效提高电动无人机动力参数设计的可信度和精度. Based on the theory of the leaf amending and the calculation formula of the aerodynamic coefficient of the three-dimensional wing, a new method to analyze the double-blade pitch propeller is proposed. According to the working principle and characteristics of the brushless motor with external rotor, the performance of the dynamic UAV system The mathematical model of the characteristic calculation was established.Using this model, the experimental data of zero-space velocity of 17 different propellers and motors were analyzed.The results showed that the model was correct in principle, with high precision and good engineering operability, which could effectively improve electric unmanned Reliability and Precision of Machine Parameter Design.