3D-Printed Emergency Whistle Test

A whistle that I designed to be compact, super-loud, and fast-and-easy to print. Good for sports and hiking, survival etc. Compact and handy, just 20 x 54 x 10 mm in size.

The two chambers of slightly different lengths produce dominantly 3468 Hz and 3609 Hz tones (when printed at 100% size). Combined, they produce a piercing whistle that pulsates at 141 Hz.

https://www.thingiverse.com/thing:471...