e9-4 nice flight. deployed chute which tore right off. strings still attached to swivel. and a nice little 3 inch zipper. with about 15 ft of kevlar. i guess i should have added elastic to the end of that kevlar. now its on the back burner until i complete some of my other projects. i am working on a big dog by quest. i sure hope i dont get these same results. i replaced the tiny kevlar with some thicker and added a few ft to it with the elastic. I need to learn how to make zipper less designs. and chutes that wont just tear off. i have some pro series 24 inch nylon. that chute that broke was a 24 inch estes plastic chute. what a joke.