The purpose of this study was to clear mechanical characteristics of the Japanese bow, and find the energy transfer efficiency. The exeperiments were made by five classes of bows, arrows and strings heights. The potential energy(PE)was calculated on every bows.
And the kinetic energy (KE)was calculated from shooting experiment according to arrows and strings heights.
Then, the energy transfer efficiency was obtained on KE/PE X 100.
The results were as follows:
1, Relation between the drawing length and the drawing force shows a inverted S curve. This characteristic is constant regardless of the bow's strength and strings height.
2, The potential energy is increased by the drawing length. The general tendency that the strong bow has high potential energy was evident.
3, The minimum of the energy transfer efficiency lies on 15cm of the strings height in the experiment according to five classes strings height.
4, In this study, the energy transfer efficiency is increased until 29g of the mass of arrow. And more than that, the energy transfer efficiency was decreased. It seems that there is a matching point of bow and arrow.