Metal parts and other delights
It's pretty well known that the NAR Safety Code does not permit metal parts composing a model rocket. However, there are a few notable exceptions. First, is the metal spring clip. This is almost essential for most rockets, and it tends to be something that is permitted, or overlooked. Second, is the screw-eye. In the days of balsa wood nosecones, this was essential to securing the shock cord and/or parachute to the nosecone. Third, is the fishing lure swivel, which is very commonly added at the gathering point of the shroud lines of a chute to prevent tangling. Though this device can be quite heavy and strong in higher power levels, they are relatively minor for low power. The only drawback that I have heard, is that most cheap versions contain a sharp point on the clasp, which can poke or rip a plastic chute. So, with this background of metal parts in mind, I was a bit surprised to see an old-school plan for a model rocket that specifically calls for a metal st...