This is the combustion chamber of the potato cannon, the area in which the fuel explodes.
Ammo and fuel.
The two small wires you can see in the combustion chamber form the spark that ignites the fuel.
Because this is a very simple cannon, known among spudgun enthusiasts as a "spray and pray," it runs off of normal hairspray. My next cannon will employ a regulated propane metering system, allowing for a consistent amount of fuel to be released in the chamber every shot.
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