Great discussion so far! Based on my experience building pneumatic launchers, I’d recommend upgrading to a 1-inch sprinkler valve for better airflow versus the standard ¾-inch. The performance jump is noticeable, especially with larger projectiles. For safety: • Always use schedule 40 PVC (never thi...

Great thread! I’ve been tinkering with potato cannons for a while and thought I’d share my two cents. For fuel mixtures, I’ve found that propane offers more consistency than hairspray, especially if you use a metering system to control the mix (around 4-5% propane-to-air ratio works well for me). Ju...