Air Raid Siren

Quick and dirty air raid siren that makes sound that can be heard from distance. Original idea and first design took about 20 minutes and print time was about 4 hours per part. New updated version has dual tone outer so it sounds little diffirent than original. Siren is designed over 2212 quadcopter motor (from crashed Cheerson CX-20) and is running really nice with 3S and 4S batteries. When running it longer time there is possibility that motor runs hot but i have not had that problem. In the b