Good shock cord can be hard to find. This is doubly so for a mid-power rocket build, and happened to be the last component (along with parachute shroud lines) of my completely homemade (no commercial parts, aside from the motor and launch lug, used) mid-power rocket. Finding a tube and material to cut fins and a parachute was easy and making a nosecone was tedious, but the shock cord just kept bugging me. I wasn’t about to cut up my clothing in the name of rocket science, nor was I about to back down on my challenge to use only common household items, yet I needed a strong, cord-like material.
That’s where I got the idea to make my own cord material. I had previously attempted to make strings of duct tape, but that was just too difficult. Enter the idea to use medical tape. Medical tape has the advantages of being lightweight, yet tough; adhesive, yet pliant. After several weeks devoid of ideas, a great piece of shock cord came to fruition within minutes. By simply folding the tape in half, I had a great cord that wasn’t too rigid or too weak. Parachute shroud lines? I just quartered the shock cord for a thin line. My shock cord weighs in at just 9.4 g/m, which isn’t so bad for a mid-power line.