When air flows in behind the piston faster than it leaks out of the holes, pressure builds up in the manifold. Small holes in the piston allow limited airflow through from behind a rubber washer inside the piston acts as a check valve, passing air in only one direction and increasing efficiency. How It Works The piston rests in the piston carrier, and the entire system is at ambient air pressure. The Boom Stick creates a pressurized volume of air and releases it very quickly, generating a loud shockwave. Inspired by the PVC-based designs of spud gun enthusiasts (but leaving out the potato), I’ve found a better approach: a two-stage, chamber-sealing, quick-exhaust, piston-valve air cannon that you can build out of common plumbing components for about $100. Home projects that rely on a standard air compressor typically use smaller, cheaper water valves from washing machines or sprinklers, but for me, these designs have yielded only a disappointing “poof-hiss.” Haunted house suppliers and special-effects houses sell commercial models with large-gauge QEVs, but these cost hundreds of dollars. In its simplest form, it consists of an air reservoir, a quick-exhaust valve (QEV), and sometimes a resonating chamber. The air cannon is a great and safe device for such scares. Some of my effects instill fear through foreshadowing or complex storylines, but the most effective way to scare people is often just a simple, brute-force startle. I work in haunted houses during the Halloween season, as an actor, guide, technician, makeup artist, and effects creator. It assaults the startle reflex of any nearby victim, adding an instant rush of physical terror to haunted houses, art pieces, pranks, and performances. The super-loud Boom Stick is a PVC air cannon that delivers maximum bang for the buck. Showcasing amazing maker projects of 2022 Gift the gift of Make: Magazine this holiday season! Subscribe to the premier DIY magazine todayĬommunity access, print, and digital Magazine, and more Share a cool tool or product with the community.įind a special something for the makers in your life. Skill builder, project tutorials, and more Get hands-on with kits, books, and more from the Maker Shed
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