Yumi Totally Explained

Everything about Yumi totally explained

is the Japanese term for bows includes the longbow, Daikyū and the shortbow, hankyū) used in the practice of kyūdō, or Japanese archery. The yumi is exceptionally tall (standing over two meters), 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 construction used may be a Japanese development of the laminated bows widely used for centuries across Northern Eurasia and in Jōmon times in Japan.

Shape

The yumi is asymmetric; the grip is positioned at about one-third the distance from the lower tip and upper and lower curves 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. Others claim that asymmetry was needed to enable shooting from a kneeling position and yet another explanation is the characteristics of the wood from time before laminating techniques.

String

The string (tsuru) of a yumi is traditionally made of hemp, although most modern archers will use strings made of synthetic materials such as Kevlar, which will last longer (around one thousand shots). Strings are usually not replaced until they break; this results in the yumi flexing in the direction opposite to the way it's drawn, and is considered beneficial to the health of the yumi. The nocking point on the string is built up through the application of hemp and glue to protect the string and to provide a thickness which helps hold the nock of the arrow in place while drawing the yumi.

Regard

Serious kyūdō practitioners treat the yumi with reverence, as pieces of great power, and as teachers with much to impart to the student (a yumi is said to hold within it part of the spirit of the person who made the yumi). A kyūdō student will never step over a yumi which lies on the ground (that would be considered disrespectful), and will typically treat a yumi as they themselves would wish to be treated (for example kept away from excessive heat or cold, kept dry, kept away from excesses of humidity or dryness, carried upright). It is also considered disrespectful to so much as touch another person's yumi without his/her permission; yumishi (yumi-maker) Kanjuro Shibata has said this is tantamount to touching someone else's spouse in a sexual manner.

Care

A bamboo yumi requires careful attention. Left unattended, the yumi can become out-of-shape and may eventually become unusable. The shape of a yumi will change through normal use and can be re-formed when needed through manual application of pressure, through shaping blocks, or by leaving it strung or unstrung when not in use.
The shape of the curves of a yumi is greatly affected by whether it's left strung or unstrung when not in use. The decision to leave a yumi strung or unstrung depends upon the current shape of the yumi. A yumi that's relatively flat when unstrung will usually be left unstrung when not in use (a yumi in this state is sometimes referred to as being 'tired'). A yumi that has excessive curvature when unstrung is typically left strung for a period of time in order to 'tame' the yumi.
A well cared-for yumi can last many generations, while the usable life of a mistreated yumi can be very short.

Bow lengths

Height of Archer	Arrow Length	Suggested Bow Length
< 150 cm	< 85 cm	Sansun-dsume (212 cm)
150 - 165 cm	85 - 90 cm	Namisun (221 cm)
165 - 180 cm	90 - 100 cm	Nisun-nobi (227 cm)
180 - 195 cm	100 - 105 cm	Yonsun-nobi (233 cm)
195-205 cm	105 - 110 cm	Rokusun-nobi (239 cm)
> 205 cm	> 110 cm	Hassun-nobi (245 cm)

Yumi history

Time Period	Type of Bow	Bow Formation
Prehistoric	Maruki	Single piece of wood
c.800-900 AD	Fusetake	Wood with bamboo front
c.1100 AD	Sanmaeuchi	Wood with bamboo front and back
c.1300-1400	Shihodake	Wood surrounded with bamboo
c.1550	Sanbonhigo	Three-piece bamboo laminate core, wooden sides, bamboo front and back
c.1600	Yohonhigo	Four-piece bamboo laminate core, wooden sides, bamboo front and back
c.1650-Modern times	Gohonhigo	Five-piece bamboo (or bamboo and wood) laminate core, wooden sides, bamboo front and back

Further Information

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