Abstract
It was thought that the take-tonbo (dragonfly-shaped flying toy made of bamboo) has been originated by Gennai Hiraga (Japanese naturalist) at Edo era in Japan and it is a toy which could be made comparatively simply. Therefore many people had their experiences to make it at the times of elementary school or junior high school. In this paper, under the considerations about the principle of its flying from the measurement of lift by making use of an electric scale, the rotating stability from three moments of inertia and the balance of the masses of wing and shaft, the results of lesson practice for making the take-tonbo to junior high school students is reported.
