DWV? unfortuneately i didnt get any pictures but ill try and show you my new design somtime. no i had fired it many times before but this was only the second time i had fired apple out of it. perhaps the friction between the apple and the barrel was to great? although when i think about it i did put ...

thanks guys,if only i could try these suggestion :(
this afternoon my cannon exploded. The chamber was completely destroyed but the barrel is ok. the sparker was even blasted a good 30 ft away. im ok but it did mannage to burn my arm and give me a bit of shellshock. i think i may try to make a ...

i recently built quite a large combustion cannon. i used an 18 litre water butt for the combustion chamber which takes about 4 seconds of hairspray to fill and a 6ft barrel which has a 3inch diameter. For the ignition i used a bunsen burner sparker.
But when i fire it the cannon seems to "suck" in ...