特撮における時間の相似則

抄録

　　　Scale modeling based on static and dynamic similarity has been widely used with high-speed photography techniques for motion pictures to reproduce unrealistic world. Focusing on video works created by SFX as examples of scale modeling experiments, this paper attempts to explain the scale modeling theory, so called “Law approach” which is a method to derive the scaling law based on deep physical insights. To accomplish this, the falling motion of an object in fluid is taken up as the simplest but frequent case. The governing equation of the phenomenon is considered, and the magnitude of each term is estimated. A quantitative comparison demonstrates which factor is most significant in that phenomenon. Though it seems a relatively complicated explanation, it is believed that this approach gives a clear insight into how the dominant factor(s) is extracted in the Law approach.