The syringe connected to the torch is maybe 1cm wide, and has 5ml capacity. The rubber hose has a hole about 2mm wide and the walls are the same. I got it from an old broken bike pump. The second syringe however, can be any size, I just use a 3ml or 5ml one in this case because of the convenient ...

So, out of random boredom, I took a half hour out of my day to build this fuel meter and Mini pill bottle cannon from extra parts.

The cannon uses a barrel from an old bb gun, and bbs lodge in the back of the barrel when you let it drop in from front. Has piezo ignition from lighter and a screw for ...

PotatoFlinger, I highly doubt that a lead projectile would scrape a steel barrel.
Even look at regular pellet guns, they do the same thing, inflate the skirt to make a perfect seal.

How do you install a chamber fan? Just glue it inside or what?

Barrel will be 36" long. And I'll try doing syringe metering.

Okay so I am currently in the process of making my third cannon. My first was the basic potato cannon with hairspray and a piezio bbq igniter, then I made a small pneumatic, and now I am making another combustion.

I have a few questions.

1) Will a propane torch work well as a spray and pray type ...