How to Make a Large Bore Vacuum Cannon https://peertube.dngr.us/videos/watch/f16cdf7f-a5b9-423c-90c8-d3b57c2f8e3e In this video I show how to make a large vacuum cannon with a 4 inch bore. Vacuum cannons are a classic science experiment used to demonstrate atmospheric pressure, though very rarely are they made as large as this. My ammunition is 3 inch PVC end caps, and atmospheric pressure is the only force responsible for firing them. See my earlier video for how to build a manual vacuum pump: https://youtu.be/UkPLu6mgdWA If you are not one of my Patreon supporters and would like to help my channel to improve check out my page and please consider contributing here: https://www.patreon.com/NightHawkProjects Special thanks to my top Patrons! Syniurge, Matthew Leitzke, & TheBackyardScientist! Thanks for watching! Sat, 13 Jun 2026 12:53:12 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us How to Make a Large Bore Vacuum Cannon https://peertube.dngr.us/lazy-static/avatars/41a6fee9-7f57-42d0-a5fc-5db4f1af2e31.png https://peertube.dngr.us/videos/watch/f16cdf7f-a5b9-423c-90c8-d3b57c2f8e3e All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.