Ammo for your air cannon! Originally scaled to fit a 1.5sch40 PVC pipe and has a 1.56 (39.57mm) overall diameter, feel free to scale to fit your desired pipe size. Has 4 individual whistle chambers that ensures it whistles from the time it launches to the time it lands.

Example Scaling:For 2sch40 pipe, you'd want to scale this model to 129.01% to reach 2.009 (51.05mm) diameter

Videos of it being shot:

https://drive.google.com/file/d/1TRu1flqugVvNntsaaBx8f4xWmM8Y_TBi/view?usp=drive_link

https://drive.google.com/file/d/1Td64owbyynOn7Eh8PPbuuCsdv7SPG3PM/view?usp=drive_link

I am not responsible for any injury or death caused by this.

3D printing settingsPrints with no supports. Regular infill, 2 walls works fine, but you can adjust to your needs if you want more durable projectiles.