Wouldn reusable aluminum cases be better and safer than PVC pipe and fittings?
Aluminum permits higher pressures which means higher specific impulse or better propellant efficiency. That’s certainly better. Being able to reuse the chambers, bulkhead and nozzle would save money, too. If you want to go this route, we recommend buying the Kosdon reloadable motor hardware set. The graphite nozzle is reusable 25 times or more. You can make your own reloads for it using the methods in the bookset. The cost of the already proven Kosdon hardware is the same as if you went to a machine shop and had them make your own design. There are lots of suppliers of the Kosdon hardware. From a safety standpoint, aluminum is not better than PVC. If the propellant detonates or overpressurizes at almost detonation rates, aluminum will fracture just like PVC. It is a myth that aluminum only splits and does not fragment. If a case is going to fragment, the PVC plastic is actually better since the plastic fragments will not go as far or penetrate skin as well as metal fragments. To see fo
