 Show Arrow Myth: An arrow is always straight. Arrows SHOULD be perfectly straight when not in motion. However, when an arrow is released the force applied from the string causes the arrow shaft to be compressed against the resistant static weight of the arrow point and therefore bends. Since the force applied is greater than the resistance (weight of the tip), the arrow is propelled forward, and the shaft continues to flex and oscillate as it straightens itself. Arrow shafts that are either too stiff or too flexible will not fly well and will impact the accuracy of your shots or fail causing damage and/or injury. Therefore, we need to manage the flex properly so the arrow does not make any contact with the bow, or your arrow flight will be affected. Important Tip: Arrow spine refers to the arrow shaft’s degree of stiffness (how much the arrow resists being bent) and is called spine deflection. Basic Rule 1: Shorter arrows act stiffer and longer arrows act more flexible. Basic Rule 2: Powerful bows require stiffer arrows and less powerful bows require shafts that are more flexible. Basic Rule 3: The heavier the tip equals greater the resistance, therefore the greater amount of compression. So, a heavier tip causes the arrow to flex more and a lighter tip increase the stiffness. According to the American Society for Testing and Materials (ASTM) the modern standards (ASTM F2031-05) an arrow’s official spine deflection is measured by hanging a 1.94 lb. weight in the center of a 28″ suspended section of the arrow shaft and is used for aluminum and carbon fiber arrows. (I believe original AMO standard has a basic guide to use for wood arrows spine determination and uses of 2 lb. and 26” section for standard measurement.) The actual distance the 1.94 lb. weight causes the shaft to sag down is the arrow’s actual spine deflection For example, if a 1.94 lb. weight causes the center of a 28″ arrow to bend down 1/2 inch (.500″) the spine deflection would be .500″. Stiffer arrows will bend less and more flexible arrows with bend more. Fortunately for us the engineers have already done the math for us and manufacturers provide spine selection charts. You are able to select an arrow based on your draw length and draw weight. What is arrow stiffness?The spine rating of an arrow is simply a measurement of its stiffness. The same Easton arrow comes in a variety of stiffness: the lower the number, the stiffer the arrow. For example, a 330 arrow is stiffer than a 500 spine arrow.
What is air resistance arrow?Air resistance is a part of archery that people try to avoid. This is the reason the arrow is so thin, to try to avoid air resistance. With such a thin arrow it can slice through the air easier.
What forces act on an arrow?(d) While the arrow moves towards its target, the forces acting on it are due to gravity and that due to friction of air.
What is it called when you pull an arrow?Draw—Pulling an arrow the proper distance. Drawing Fingers—The fingers used in pulling a bow—the first three of the drawing hand.
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What is another term for an arrows resistance to bending
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