What is the role of the wheel in a universal compound bow?

The role of the wheel in a universal compound bow is pivotal for the bow's function, particularly in how it assists in transferring motion from the limbs to the arrow. The wheels, often referred to as cams in compound bows, are designed to create a mechanical advantage when drawing the bowstring. When the archer pulls the drawstring, the limbs of the bow flex, and the wheels translate this action, effectively converting the energy created by the flexing limbs into movement that propels the arrow forward.

This system of wheels allows for an efficient transfer of energy, ensuring that as the archer pulls back the string, the arrow is launched with increased speed and accuracy. Additionally, the design of the wheels helps reduce the holding weight after reaching full draw, allowing the archer to hold the bow more comfortably before releasing the arrow. In this way, the wheel serves a crucial function that directly impacts the performance of the compound bow.