yea i ment diameter i finished now and it works it shoots like 80 meters with this crappy hairspray im going to get something else can anyone recomend anything also i use onions there easy to fit and are light and lubrecated well only prob is the smell but i can live with that.

hey im from new zealand and im making a basic combustion spud cannon and over here pvc piping is a *&%&ing rip of my end cap cost me 30 bucks alone but the acual pipe isnt dare i was wondering does it matter it i have a long combustion chamber its about twice the thickness of the barrel but its long...