As the bow length becomes longer, the elastic module becomes higher based upon the cross-section and the same pulling power and the elastic limit becomes lower and the weight becomes lighter, but the flying distance increases.
-弓丈が長くなると同じ断面積で、引く力が同じなら弾性率は上がるが、弾性限界は低くなり重量も重くなるが、飛距離は伸びる。