Hi, this is my first post on this forum and i wanted to show you and idea that came to my mind. this is not one of those over complicated designs in fact it is very simple and theorycally it can boost the speed by 2, thats mean if rubber can make 300 fps this will make 600fps. youtube video showing the concept: [ame="https://www.youtube.com/watch?v=VrZbgOlSJcU"]https://www.youtube.com/watch?v=VrZbgOlSJcU[/ame] the idea is to attach a cord to your shoulder and use a roller pulled by the slinshot. the rubber needs to be half shorter but 2 times stronger, the cord should ideally be made of Dyneema and the roller small and light weight has posible. what do you think? i would love if someone could make it real.