I have a 4 foot by 2.5 inch piece of drain pipe as a barrel and i am stuck on what to use for a combustion chamber, what would be the best thing to use?

thanks in advance

cannon

changed my mind about what im using now, im using abit of drainpipe lol and its been working fine for a while now and i started to up the gas and now its blowing the end cap off :o and i cant seem to hold it on properly. i am using a very strong glue but so far it is not working any ideas what to do?

how old are you mate, u said ur dad nearly grounded u

now im using a pop bottle and made a trigger box because the first time i tried it the bottle blew apart so now im fireing from a distance, seems to work ok, just need to seal the holes where the wires go in for the spark

Pics coming soon

so how much or how long do i spray? also would it be a good idea to use a bottle like this?, but without the nail varnish remover in it lol

http://www.remployht.co.uk/media/images ... 250_sm.jpg

yea i take the ammo out and then blow through the pipe making sure it all gets clear then start again, im currently using hairspray and a screwed up rizla, any reccomendations?

right, i have attempted a mini combustion gun and it is not igniting, there is a spark but no umph from the chambre, it doesnt fire or anything just dead as it is my first time making a gun and i only used simple items im not sure if i have done it correct but i have seen it done with the same items...