A compressible air permeability model is developed to simulate the aerodynamic performance of the supersonic porous canopy. And a single-degree-of-freedom model is applied to analyse the static stability of the parachute. By using this method. the flow structure of the parachute system with big attack angle is obtained. https://countryscenesaddleryandpetsuppliers.shop/product-category/western-work-browband-bridle/