Engineering:Kunai

Short description: Japanese gardening and masonry tool adapted as a weapon

A highly stylized plastic kunai, as often portrayed in popular culture

Design

A Kunai normally had a leaf-shaped wrought blade in lengths ranging from 20 and 30 cm (7.9 and 11.8 in) and a handle with a ring on the pommel for attaching a rope. The attached rope allowed the kunai's handle to be wrapped to function as a grip, or to be strapped to a stick as a makeshift spear; to be tied to the body for concealment; to be used as an anchor or piton, and sometimes to be used as the Chinese rope dart. Contrary to popular belief, kunai were not designed to be used primarily as throwing weapons. Instead, kunai were primarily tools and, when used as weapons, were stabbing and thrusting implements.

Varieties of kunai include short, long, narrow-bladed, saw-toothed, and wide-bladed. In some cases, the kunai and the Nishikori, a wide-bladed saw with a dagger-type handle, are difficult to distinguish.

Uses

The kunai was originally used by peasants as a multi-purpose gardening tool and by workers of stone and masonry. The blade is made of soft iron and is left unsharpened because the edges are used to smash relatively soft materials such as plaster and wood, for digging holes, and for prying. Normally, only the tip is sharpened.

Weapon

Many ninja weapons were adapted from farming tools, not unlike those used by Shaolin monks in China. Since kunai were cheaply produced farming tools of proper size and weight and could be easily sharpened, they were readily available to be converted into simple weapons. As a weapon, the kunai is larger and heavier than a shuriken and with the grip could also be used in hand-to-hand combat more readily than a shuriken.

As with ninjutsu, the exaggeration persistent in ninja myths played a large role in creating the popular culture image of kunai. In fictional depictions of ninjas, the kunai is commonly portrayed as a steel knife that is used for stabbing or particularly throwing, sometimes confused with the shuriken.

Masonry

The kunai was used in masonry to shape stonework.

See also

• Hori hori
• Shuriken
• Tantō
• Throwing knife
• Trowel

Further reading

• Hatsumi, Masaaki (22 September 1988). The Grandmaster's Book of Ninja Training. McGraw-Hill Education. ISBN 978-0-8092-4629-8. https://books.google.com/books?id=8AwlJCWU1GMC. 
• Mol, Serge (2003). Classical Weaponry of Japan: Special Weapons and Tactics of the Martial Arts. Kodansha International. ISBN 978-4-7700-2941-6. https://books.google.com/books?id=ZzIXkFec0e8C.