How to determine the length of bowstring when novice self-made glass slides come back for help?

The length of the bowstring determines the pulling distance. The longer the distance, the harder it is to pull, and the average person is about 35 kg. If it is a standard bow piece of 35 kg, the length will not exceed 1.25m, that is, the length of the bow string will not exceed1.25m. If it exceeds the number of pounds, it will increase, which is strong enough to pull the full moon. 40 pounds is about 1.3 meters. If it is more than 50 kg, even if it can pull the full moon, how many arrows can be shot continuously, except for those who are born with divine power. It's no problem to wear a paint bucket within 35 kg and 30 meters. The length of the bowstring can be determined according to the length of the individual's arm and the habit of pulling away. There are also differences between arrows. A 7 mm fiberglass arrow with a 35-pound bow is the most suitable. If used skillfully, you can hit the bottle cap within 30 meters. I can hit the can with three arrows at 30 meters, and the error is not more than10 mm.