The barrel is 2m long and 50mm in dia. It is sleved for golf balls.
Chamber: 110mm Class 9, pressure pipe. and is 35cm long.
It has a chamber fan, and a propane metering system.


How the fuel is injected into the chamber:



Duct tape on the batt box was a quick field repair:


Golf ball vs. Corrugated iorn

It shoots golf balls round about 400m
Any suggestions and comments are more than welcome