throwing knife with adjustable weight Balance of a throwing knife

See also: The physics of knife throwing

The center of gravity (COG, also called center of mass) should be in the lengthwise middle of the throwing knife, plus or minus 1.5cm. Such a balanced throwing knife will make nice, round circles in the flight. If the balance point is further off the middle, say the knife is rather blade heavy, the circles of the handle and the circles of the blade in flight will be of different diameter, making the throw less predictable.

Some people say that off-balance is just an additional challenge, but I still prefer center-balanced throwing knives for two reasons:

If someone hands you an off-balanced knife to throw, you can do it, provided you remember the golden rule: Grip the light end! Hence, a blade-heavy knife would only be held and thrown from the handle. Conversely, if you grip the heavy end, the center of gravity will be inside or close to your hand, and the knife will resist a smooth release. Try out gripping the wrong (heavy) side, and experience the awkward feel in a throw.

Find the balance point by moving the knife to the point where the knife does not tilt to either side. To find the center of gravity, just place your knife across your outstretched index finger and adjust until it is in balance and does not tilt to either side.

When looking at how to balance a throwing knife perfectly, often a ratio of weight per length is mandated. In his classic book Knife throwing - a practical guide (p. 18) McEvoy recommends one ounce per inch (11 g per cm). In practice, this sweet spot seems to be far more flexible. There are excellent throwing knives available that range from the Glock (6.9 g/cm), Hibben (7.1) and Dubé (8.8) on one end to the Faka (11), Perfect Balance (12.5) or even a hefty Mountain Bowie (14.9 g/cm) on the other.

Some knife throwers have a strong personal preference for holding the knife at the blade. They use a big arch for their throw and like its slow half spin rotation.

In no spin knife throwing, the suitable balance depends rather much upon the personal throwing style. The recommendations go from neutral-slightly handle balanced to handle heavy - the (external link / new window)Bearded Rat advocates a balance point at 39% of the overall length (towards the handle) for instinctive throwing. In fact, for beginners it is easiest to start no spin throwing using a handle heavy throwing knife like the Arrow (40%).

Balance of common throwing knives illustrated. The green line is the middle of the length, the fuzzy dot is the center of gravity. Check out the balance of the four example throwing knives in the picture (top to bottom): Faka, Bainton-Walton Bowie, Glock, and TomTom Arrow. The green line denotes the lengthwise middle of each knife, the fuzzy green dot marks the center of mass. Do note that all of the knives have their center of mass shifted towards the handle. In fact, in my personal throwing knife collection, I did not find a knife that was truly blade-heavy. The most typical balance for a throwing knife is exemplified by the Faka, with the balance being rather close to the middle, but on the handle side. The Bowie only appears to be blade-heavy. Once the centre of gravity proportionally moves as far towards the handle as with the Glock, you are forced to grip it by the blade for throwing. The Arrow at the bottom being an exception to the golden rule, as its handle-heavy design is tailored for no-spin throwing, where you need to have the bulk of the mass shifted towards your palm. In summary, how to balance a throwing knife depends on your intended throwing style - but I know you will prefer a knife that is slightly handle heavy.

There are throwing knives in the market with built-in movable, adjustable weights. I do not recommend them, it is too easy to get obsessed with adjusting the weight - with a negligible effect on the balance. If a knife does not stick, you change the distance or your grip, not the knife. Plus, the grooves for the weights are not easy to clean, and the weights are prone to come loose.

The overall recommendation for a center balanced throwing knife for beginners is the Faka.

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