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. Efficient compound bows have limbs that are stiffer as compared to the traditional longbows or re re-curve bows. This is true since the compound bows are not made using wood. The reason is seen in the view of energy efficiency as wood is not a good raw material for the compound bow manufacture.
The modern, efficient compound bows have a pulley and lever system that contribute to its extra stiffness. You cannot flex the compound bow if these features 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 ability to be used in any weather is another added advantage of the modern compound bows. It can be hard to use bows made of wood in damp or rainy weather as most woods absorb water. It is also not easy to use the old-fashioned woody bows in the dry season as they will crack as a result of drying up of the natural oil present in the wood.
Some have always argued that in making good quality compound bows, which are the best materials to use. Others can also argue that which are the specific types of compound bows present in the market. The answer to these arguments is that a compound bow is good as long as it is made for materials like magnesium, aluminum, or their alloys that are used in aircraft construction.
The limb contains the strength of a modern compound bow. The pulleys or the cables store no energy. The wheels and cams are used to move the string for a smooth function, so their construction is also important. 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.
Direct control of the speed of the arrow is done by the cams, and there are a few different kinds of compound bows having either soft or hard cams. The softer cams are used in the compound bows specifically with those who are new to the field of archery.