Thanks for all the compliments and comments guys! The hardest part of this whole project was finding good placement of all the components. I'm actually left handed so the trigger is in the right spot (by coincidence, not by design) I didn't consider the bottle will be upside down when loading but it...

Being my first cannon I wanted this to me moderate in size. Its 90% complete. I just have to add the fan battery and control box. Specs: Chamber is 3" x 10" PVC Barrel 1 1/4" x 30" PVC All other joints are ABS Barrel is detachable Electronic BBQ igniter with dual sparks Safety switch with red switch...

Thanks for the info guys. The BurntLatke site is actually where I got the inspiration to build a propane injection cannon. The only concept I did not fully understand was the bars of pressure until it was explained in the above posts. This is what I get: A 60 ml shot of propane would need a 1428.57 ...

Newb with a newb question here. I'm building my first cannon and I've bought and assembled everything except the PVC. (perhaps I'm building backwards?) I've built the propane meter pipe and now need to know how long to make the combustion chamber if I use 3" SCH 40. I also plan on making this an ove...