Dual Air raid siren
thingiverse
I've compiled a list of essential videos for your reference: Video No.1: https://www.youtube.com/watch?v=7wKp-wbVYk4, and Video No.2: https://www.youtube.com/watch?v=ZKrGsNs_vmI&t=2s. STEP files are now available. Air Raid Siren for 3D Printing is Ready! To build this model, I've used two powerful 2204, 2300kv brushless motors and a robust 13A brushless ESC with a 3S Lipo battery. The throttle is set at maximum 40%. The noise level reaches an impressive 110 dB.
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