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1. Home
2. Ultimate Katana Buyers Guide
3. Samurai Sword Terminology
4. Bo-hi
Amazing Deal from the Official SBG Sword Store
--------------------------------------------------------------------------------
BO-HI
A bo-hi (also known as a 'bohi','hi', 'fuller' or 'blood groove') is simply a
groove literally carved into the blade of a Japanese sword that helps to reduce
the weight slightly without major sacrifices to its durability.
It achieves this in much the same way that I-beams in the construction industry
reduce the weight of building materials with minimal loss of structural
integrity.
In addition to reducing the weight of a sword (typically by 2-3 oz) it also ever
so slightly shifts the balance point further towards the handle than it would
otherwise be without one (typically around .5-1"). The end result of these
adjustments to the swords weight and its balance point tends to produce a sword
that is slightly faster in the hand.
As a trade off for speed, the lighter the blade and the more balanced towards
the hilt it is, the less powerful its cutting action is and it is ever so
slightly less durable (which is only really noticeable under extreme cutting
conditions).
The final benefit of a bo-hi is that the groove tends to amplify the sound of
the sword as it wooshes through the air, which in Japanese is called
"Tachi-Kaze" (sword wind sound). How loud it is will depend upon the speed and
correct technique of the practitioner, and so it is used as an auditory feedback
device to let the sword student know which of their cuts were good and which
ones need more improvement.
THE MYTH OF THE 'BLOOD GROOVE'
Some people have got it into their heads that a bohi or any type of fuller's
main purpose was to allow blood to drain down the groove and to prevent suction
causing the blade to get stuck in the internals of an opponent when thrusting to
the body.
It sounds cool maybe, but it is just that - a myth. The only purposes are to
lighten and shift the balance of the blade and produce audible feedback.
TYPES OF BO-HI
In addition to the standard full length groove that terminates either just
before or actually under the habaki blade collar, there are several less common
variants.
One such variant is the double bo-hi, which has two - shallower - fullers
instead of one. However, from a practical viewpoint, the effect on handling is
the same as a single, deeper fuller - the only difference is, it is perhaps more
visually interesting.
Example of a double bohi
Another is a partial bohi, that is to say, a groove around 1/3 the length of the
actual blade.
Example of a partial bohi
Finally, the point where the groove terminates: most mass produced swords have
the groove machined out which produces a rounded termination point. However,
traditional blades where the groove terminates near the kissaki tip are usually
hand shaped to follow the actual contours of the tip.
You can see the two types side by side below.
Left, a standard mass produced bohi and right, one that has been hand carved to
follow the shape of the kissaki
To achieve this, it is necessary to hand carve the groove, which adds
considerable time and expense to the swords production and few sword makers
actually do this (though, as is quite often the case with production swords,
this short cut is cosmetic only).
--------------------------------------------------------------------------------
I hope this information on bo-hi has been helpful. To return to Samurai Sword
Terminology from Bo-hi, click here
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