Archery is an exciting sport that is suitable for all ages and abilities but selecting the…
While most shooters of archers are not interested in the subject of Archer’s Paradox at all, the core of archery lays in physics. It entails the transfer of energy from the draw to your limbs and then the arrow in flight. Even, so it is beneficial to learn more about the arrow in flight. So ask yourself do you know what the Archer’s paradox is and how is it possible?
Definition of archer’s paradox
Paradox is anything, situation, or person that exhibits behavior contradictory to nature. The question would be how paradox relates to archery. Coined by E.J. Rendtroff in 1913, archer’s paradox describes the arrow flexing around the riser whenever it is shot. Rendtroff saw this in the film by Clarence Hickman- the person celebrated as the father of scientific archery.
Even so, the term archer’s paradox is more that the dynamic flexing. The paradoxical event can be seen when the arrow pointing off center and the longbow riser is blocking it from lining up straight with the target and bowstring. So, the paradox is that the arrow from longbows aim off the center and yet manages to hit the center target.
How is the Archer’s paradox possible?
With a naked eye, arrows seem to pierce the sky with remarkable straightness. But, if you look the arrow in slow motion, it is anything but straight. The straight arrow will appear to be more like a spinning, flopping wet noodle. It will bend back and forth and oscillate around. When the arrow is projected, it will oscillate around two balance nodes- one near the front and another at the rear area.
The paradox starts at the bowstring. After releasing the string, it will remain in contact with the accelerating arrow, while the string force pushes from the back of the arrow. That makes the back of the arrow to try moving faster that the front and that causes the whirl in flight.
Understanding more about the paradox
There are various aspects that affect the archer’s paradox:
- The bow and method of release– a compound bow and mechanical release will typically cause vertical flex in arrows (up and down). When you use your fingers to release the string on the re-curve bow, the arrow will flex horizontally. That is because; releasing with the fingers makes you push the bowstring to the side. Hence, you need consistent release since different releases alters the way the arrow flies from the bow.
- The arrow stiffness– The spine of any arrow is in its calibrated stiffness. While that may vary from one manufacturer to another, the inherent stiffness is primarily based on their material and length. The stiffness slows the flexing of the arrow in slight, and tries to stabilize when the shaft is in long flight.
- Flexing technique– An amount of flexing back and forth is a good idea since it absorbs the shock of the bowstring release. Without the flex, the back of the arrow will not make it even pass the riser. Besides, due to the bowstring, it is impossible to change the fact that the back of the arrow will receive more energy than the front.
- Spine flexibility– the arrow needs flexibility to ensure that it makes it around the grip and work its way toward the intended target. In fact, many arrow companies spend money testing spine for different materials. That is because, every arrow type shoots differently.
Exceptions of the paradox
Paradox doesn’t occur when you use compound or re-curve bows with cutout risers. That is because, the arrow is center shot and that means it travels in exactly the direction it is aiming. Besides, the riser is slightly offset from the limbs with a cutout. The cutout allows the bowstring and arrow be in alignment and thus reduces or eliminates the paradox. While the arrow will still flex when shot from a compound bow, it is not a paradox.
Archer’s paradox occurs when you aim your archer off the center and still hit the target. It involves oscillations seen when the arrow is in flight. Even so, some bows and arrows can make the archer’s paradox movement extreme leading to poor arrow flight and lost accuracy. Fortunately, skilled bowyers can design longbows with different degrees of the cutout rises to lower the archer’s paradox effects. But to achieve a cutout riser for a one-piece longbow, good wood is required since the more you cut, the weaker the point becomes on the bow.
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