Those good quality compound bows are those that bend their limbs using a system of levering cables. The limbs of a compound bow consist of the upper and lower sections that provide the strength and flex to eject an arrow. The limbs on an efficient modern compound bow are stiffer compared to the re-curve bow or the traditional longbow. This is possible since wood is not used to make the modern compound bows. The reason is seen in the view of energy efficiency as wood is not a good raw material for the compound bow manufacture. To learn more, you can view here.
The additional stiffness in the compound bow is counteracted by the levers and pulleys that these efficient high tech tools have. It can be impossible to flex the bow if these are not present. As the string is drawn back, the mechanical advantage is achieved, until the peak weight is reached and the energy required to release the arrow.
The other beneficial factor of the modern compound bows is that they can be used in any weather. Most of the woods absorb water; therefore, using bows made from wood can be tricky in rain or damp weather. Also, those traditional bows made from wood cannot be efficiently used in the dry season as the natural oil in the wood dries up and they crack.
Some can argue that which are best materials to be used to make a good compound bow. Besides, others have argued that which compound bows in the market are the best. The solution to these arguments is that a good compound bow is made from materials like aluminum, magnesium or alloys of these as long as it can be used in the construction of aircraft. Check out The Best Compound Bows for quality options.
The strength of a modern compound bow is contained in the limb. There is no energy stored in the pulleys or the cables. Also essential is the construction of the cams and wheels, as they must move the strings to function smoothly. In as much as the term string is being used, the modern compound bows are equipped with a highly efficient polyethylene cable and do not use string. The cables that can hold much tensile strength are made not to stretch, as stretching lowers the cables efficiency. The best modern compound bows use cables made from polyethylene, but some old-fashioned bow use cables made from high tensile steel.
Controlling directly the speed of the arrow are the cams and there exist few different types of bows that have either hard or soft cams. Those who are new to archery are supposed to use the softer cams in the modern compound bows. Learn the difference about compound and recurve bows: https://youtu.be/b2sCnGGwX_w