High altitude long endurance(HALE) solar powered unmanned aerial vehicle is of the design characteristics of low Renolds(Re) number which makes a great challenge to the propeller aerodynamic design. Based on the general layout of a UAV. a solar powered propeller is designed. Multi variables optimization method is used to design the blade element. https://chefesquipmenters.shop/product-category/spindle-mixer-parts-and-accessories/