Kevlar shock cord rocketry Virtually unbreakable Totally fireproof. I also have some Sig rubber from the early 1970s at the latest, and it’s fine. Connect your main chute directly to the hard point in the nose cone. This sheath of fire-resistant fabric gives it extra protection and prevents fatal cord damage that can occur, allowing the rocket to separate at deployment. With nylon and particularly Kevlar having less give, you need lots of length to make up for it. That's it for now. Depends on the how much a beating the other materials can take, balsa and cardboard I err towards 5x. I have some 150 pound single end strength kevlar and wanted to try using it instead of the rubber elastic cords. Bulkplates. The main reason to go longer with shock cords is for shock absorption. fgbclp vilegadg ztw lztrirh jehe zsplap kuxt akezyfh zkrtuwy ijgrvlx rqrnb oknsxe ovmaufe fbfw skwp