Minimum length of blades used in the Kageryu is 2 shaku 8 sun (84.8 cm's / 33.5 inches) Five inches longer than the length prescribed by the Shogunate. At this time the shortest blade used is well over that length, the longest 4 shaku (121.2 cm's /47.7 inches) The heaviest blade used is mine at just over seven pounds. In should be understood that the use of these weapons is simply a tradition which has been handed down. There is no consideration here as to the longer weapon being superior to a shorter one. The long is for distance and shorter one carried for close work.
Some have a large sori (curve) making it easier to draw. The limitation to this is that a big sori also makes a weapon unbalanced. We should cut with the kensaki (upper section of a weapon) A big curve brings the balance down to the center as it leads when you cut. It is essential to build a mock blade to test for balance and practicality before forging.
A short tsuka also causes inbalance to weapon, especially drawing and cutting with one hand. With a tsuka tsukathat is too long disadvantages are that spreading out the hands makes it far more difficult to do a cutting action equally powered by two hands at the same time. However a slight lead with the left where the power should be anyway creates a slightly elliptical cutting path. This helps in stopping the blade should it miss the target. A longer tsuka than those shown make shomen giri totally impossible. Then again as shomen giri is not a technique of the ryu it is not a problem to surmount
The shortest sword shown below is a josun or teisun (2 shaku 3 sun) What was considered to be a standard the length decided by the Tokugawa Shogunate
At the bottom is a white oak bokuto in saya (Saya-tsuki-bokken). The one shown measures 3. 6 from kensaki to tsuba
Takamuku Myoji - Retired Shihan of the Kageryu wielding his 3 Shaku 7 Sun