Let Off Analysis of Compound Bows

The Basics of "Let Off" If you have ever used a heavy recurve or straight draw bow, you will have noticed that it is quite difficult to draw the bow to full draw and maintain the maximum draw length. You have to release it as quickly as possible, otherwise your arm will shake. The compound bow was developed to solve this problem. Compound bows give archers more time to aim at the target, and require much less force to draw the bow than traditional bows. This is what is known as the Let Off and cam system. Early compound bows had a Let Off of 35-50%, which was a popular thing at the time. Today, the common Let Off is over 75%. A 70-pound compound bow with 80% less draw weight will require only 14 pounds of force to draw it to full draw. With such a small draw weight, the archer can aim and shoot calmly. What is a little worrying is that the Let Off of the bow is too large, which will make the bow "fat". It is also necessary to maintain a certain degree of resistance when the bow is fully drawn. However, average archers prefer bows with high and medium Let Offs because they are more comfortable to shoot. Only those with advanced skills prefer bows with low Let Offs.
A high Let Off (above 75%) will reduce arrow speed, and cam systems will reduce arrow speed slightly. A compound bow with a 65% Let Off will shoot faster than a compound bow with an 80% Let Off. However, the speed difference is only a few FPS. Fortunately, many cam systems use interchangeable modules, giving you options and easy switching. Some cam systems also offer adjustable effort ratios, with cam assemblies included, without the need for additional modules. If you want to experiment with effort ratios and experience the difference between different effort ratios, look for such models. When you buy a bow, you can see that some bows have 2 different Let Offs in advertisements. The technology here is a bit confusing, so be patient and it will take a while to explain. Depending on the calculation method, the same compound bow can get two different Let Offs, one is "effective Let Off" and the other is "actual Let Off". When you draw your bow, there is friction, such as the bow string, cam bearings, and zip lines, and a small amount of tension is used to overcome this friction. The extra tension is dissipated by generating heat.
The effort saving ratio must comply with national regulations. In some countries or regions, it is not allowed to use a high Let Off bow for hunting. Therefore, if there is any doubt, please check the hunting publications to make sure that your new equipment does not violate local regulations.