With the popularity of electric multi-rotor unmanned aerial vehicles (EMRUAV). the problem of low efficiency of the motor propeller system (MPS) becomes serious especially for EMRUAVs which have multiple working states. To solve this problem. an integrated optimization design method for high-efficiency MPS is proposed using an improved parallel particle swarm optimization and differen... https://www.hairtobeautyers.shop/product-category/stretch-cap/