Pneumatic Pirate Ship Cannon

[Jolly Roger]

I reckon a well made combustion would be the go. Got the bang and the flames and all. If you look around on here in the forums and wiki you'll find out how to meter the gas properly so you don't have to fiddle around so much when refilling and you get better consistency with the shots. Not to mention power efficiency. I gues if your going to make one, even if its your first, may as well make it as best you can. Go to burntlatke.com to download a program that may help you with your chamber and barrel ratios, fuels etc. that should help you out a bit.