An aerodynamic force measurement technique was applied on the drag force measurement of the aeroshell re-entry configuration with decelerons. In the present technique, aerodynamic force was obtained as products of measured acceleration and mass of the model, which was weakly suspended with thin wires. The unsteady drag force of 230mm length aeroshell model was measured under high enthalpy condition of H_0=4MJ/kg, 12MJ/kg and 20MJ/kg in the free-piston shock tunnel HIEST. Pressure distribution and heat flux distribution around the model were also measured to obtain validation data for numerical simulations. With the present model, natural vibration which often disturbs precise measurement, was sufficiently low.
