Super-Loud Compact Emergency Whistle
thingiverse
A revised version of the whistle that I designed to be compact, fast-and-easy to print, and **super loud**. Good for sports and hiking, survival etc. Compact and handy, just 20 x 53 x 10 mm in size. The two chambers of slightly different lengths produce dominantly 3093 Hz and 3234 Hz tones (when printed at 100% size). Combined, they produce a piercing whistle that pulsates at 141 Hz. Best when printed in PLA. **Do NOT use supports!** Recorded sample here: https://youtu.be/W5zsz5FST2w -------------- If you like my work, you can support me tipping me through [PayPal](https://www.paypal.com/paypalme/jonnieZG). Thanks! :) [](https://www.paypal.com/paypalme/jonnieZG) -------------- ## Changes **2021-01-09** - Slightly changed geometry producing a loud whistle with much less effort, also giving a cleaner sound. Slight decrease in size from 20 x 54 x 10 mm down to 20 x 53 x 10 mm. Frequencies changed from 3468 Hz and 3609 Hz to 3093 Hz and 3234 Hz (resulting envelope modulation remains 141 Hz).
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