The Complete Handbook of Arrows & Bolts

Chapter 1: Understanding Arrows & Bolts

An arrow or bolt is a projectile composed of a shaft (the main body), fletching (the vanes or feathers that stabilize flight), a nock (the notch that connects to the bowstring), and a tip (point or broadhead). A crossbow bolt differs structurally from an arrow, but the fundamental physics of flight and the specification-matching problem are identical. Both must be matched to the bow that launches them, and both will fail catastrophically—in accuracy, efficiency, and sometimes safety—if that match is wrong.

This chapter addresses a problem that most archers encounter but few understand fully: why does one arrow fly perfectly while another from the same dozen tumbles through the air? Why do some people break arrows regularly while others never do? Why do manufacturers list a bewildering array of specifications, and which ones actually matter? The answer lies in the physics of how arrows fly and the engineering of how they interact with a bow.

The Basic Physics of Arrow Flight

When you draw a bowstring back and release it, the string accelerates the arrow forward. During the first few inches of travel—called the "acceleration phase"—the arrow experiences extreme forces. A typical compound bow applies roughly 50 to 80 pounds of force to an arrow weighing 400 to 700 grains (a grain is 1/7000 of a pound). The arrow must accelerate from zero to 200+ miles per hour in less than a quarter-second. This is not gentle physics.

But there's a complication. The bowstring