This week I did some research on the tension and how accurate a ballista could be and it seemed that as they got bigger they got more powerful but lost a little bit of accuracy. Since I’m trying to hit a moving target I decided to scale my design down which will also make it easier to build properly so nothing goes wrong. It’s going to be about a foot and a half long and sit on a stand with limbs pointing out about a half a foot on each side. I will have the rope coiled up in the front providing the spring for the limbs to shoot forward and a smaller cords to pull back and fall into a hook where it will stay until I pull the trigger. Then it will launch the bolt forward hopefully with enough force to shoot down a glider but it will be accurate enough to shoot it down.