Yumi Bow Power

Mainly because the power of the bow in japan was established by measuring the dimension of the core or by counting the men needed for string the bow something like a sannin bari 三人張り 3 men bow or yonnin bari 四人張り 4 men bow in ancient times.

Yumi bow power. The yumi is an asymmetrical bow and i absolutely love how it looks. Serving as an introduction to the physics of historic military technology we ll look at a paper by timo a. Yumi is the japanese term for a bow as used in english yumi refers more specifically to traditional japanese asymmetrical bows and includes the longer daikyū and the shorter hankyū used in the practice of kyūdō and kyūjutsu or japanese archery the yumi was an important weapon of the samurai warrior during the feudal period of japan it shoots japanese arrows called ya. The lower part hankyū is shorter than the upper part daikyū.

Many modern bows are not designed for war so it s hard to base it on that. Colorized photo of samurai practicing in 1860. However given the nature of yoroi samurai armour they are relatively protective against piercing and slashing. Bow crude bow short crossbow yumi bow.

This didn t stop them being the primary battlefield weapon of the samurai though. The effective range of a yumi longbow is about 30 meters against an armored samurai and 140 meters against an enemy army. If you are already an experienced archer with a longbow recurve bow or compound bow it will be tricky to shoot a yumi as the feeling is quite different as is the technique. This was the original weapon of the samurai before the katana.

The length of the bow gives it great firing power though the position of the grip may have allowed it to be fired from horseback or a kneeling position. It was devastating against the armor of the day. This is from a demonstration done in 1941 when an actual antique helmet was completely penetrated both sides at 15m. Composite bow long crossbow mighty bow pellet bow wooden bow.

Crossbow golden ratio bow longbow power crossbow scorchbow sniper bow steel bow strong bow. With 1 5x longer power draw they yumi deliver a lot more energy than normal my first bow is comfortably able to target shoot out to 70m and has a range of about 170m with my first set of arrows 20g. Japanese yumi vs english longbow yumi votes. Japanese bows had a pull of around 30lb so couldn t penetrate armour.

And the draw weight only matters if the archer has the strength to draw it. Nieminen which examines the design and physics of two of the most famous classes of bows found in asia. A yumi with a 30 lb draw weight is capable at penetrating armour from a very close range. As far as i know power is mostly about draw weight.