Dual Air raid siren
thingiverse
video no.1: https://www.youtube.com/watch?v=7wKp-wbVYk4 video no.2: https://www.youtube.com/watch?v=ZKrGsNs_vmI&t=2s STEP files inside!! Air raid siren for 3d print i use two 2204 2300kv brushless motor and 13A brushless esc with 3s lipo. throttle at max 40%. noise level 110 dB.
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