As I’ve Already built pneumatics and a hybrid I thought I’d give a straight up combustion a go. This is a bit of a spare parts cannon, the only parts I bought for it were the chamber fan and piezo sparker, the chamber is the aluminium suppressor from my first pneumatic and I chopped the barrel up for ammo, most of the rest is copper pipe which I had lying around. The main aim here was for something compact and quick and easy to shoot, thus the use of butane over propane as it's available in a much smaller canister. Power was a secondary concern but I was pleasantly surprised by the destruction I managed to achieve
The 38mm chamber fan is mounted directly to the end cap (acetal), ignition is a piezo sparker with two gaps in the spark strip.
The chamber fan is powered by a rechargeable 10AA battery pack, a bit overkill but I will be using it in another project. The grip is a piece of copper pipe with polymorph moulded over the top and an aluminium base plate.
The fuel meter consists of the valve on the fuel canister, a regulator, meter pipe and ball valve.
There is a bike pump to assist in venting the chamber.
The breech is o-ringed with aluminium spacer rings to hold the o-rings in place.
muzzle brake
Muzzle flash
Ammo consists of 1” aluminium tube (1/8” wall) filled with hot glue with a wrap of tape for a good fit
And last but not least a damage vid
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. Of course when I finally get round to building an actual semi, nobody will believe it.
