To verify the effects caused by small objects attached to the airframe, novel wind tunnel test was conducted. Measurement accuracy of aerodynamic parameters depend on measurement period, equipment used etc., but by turning the portion of the airframe where small objects are attached by 180 degree, error cause such as drift etc. are completely eliminated. Flight path calculation using the parameters obtained by this wind tunnel test and the one by the real firing coincides remarkably. The method appeared in this paper is very suitable to obtain the parameters caused by small objects on airframe.