To calculate clusters’ aerodynamic characteristics for a certain type of disaster relief airdrop system

multi-node statics model of cross parachute system was developed to calculate the aerodynamic shape of canopy.Different cross parachute models were numerically simulated with different canopy arm ratios and suspension line ratios

and the numerical results were compared with test results in literature.According to this model

and aerodynamic shape was obtained for cross parachute clusters

and aerodynamic characteristics were simulated.The results show that:the calculated results and wind tunnel test results in literature are in good agreement

and the multi-node statics model is accurate and feasible.As canopy arm ratio and suspension line ratio of cross parachute increase

the axial force increases;as the angle of attack increases

the axial force firstly decreases and then increases

whereas the normal force increases.This model can be used for calculating aerodynamic shape of parachute clusters

which is also useful for parachute system design.