Shape
The yumi is exceptionally tall, standing over two meters, and surpassing the height of the archer (ite, 射手). They are traditionally made by laminating bamboo, wood and leather, using techniques which have not changed for centuries, although some archers (particularly beginners) may use a synthetic yumi.
The yumi is asymmetric; According to the All Nippon Kyudo Federation, the grip (nigiri) has to be positioned at about two thirds of the distance from the upper tip.
The upper and lower curves also differ. Several hypotheses have been offered for this asymmetric shape. Some believe it was designed for use on a horse, where the yumi could be moved from one side of the horse to the other with ease. However, the grip position had emerged before bowing on a horse was widely spread. (refer to "Yabusame")
Others claim that asymmetry was needed to enable shooting from a kneeling position. Yet another explanation is the characteristics of the wood from a time before laminating techniques. In case the bow is made from a single piece of wood, its modulus of elasticity is different between the part taken from the treetop side and the other side. A lower grip balances it.
And another, the hand holding the yumi experiences less vibration at this point. The points one and two thirds of the distance from the upper tip are the nodes. This makes it easier for the bowyer to grip the yumi after shooting an arrow.
Read more about this topic: Yumi
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