Tell me; What good is a golf ball cannon, if it can't punch a hole through 2" of solid wood, launch a golf ball over a mile, or make your wife's dog dump its kidneys on the living room carpet?
While the "over a mile" claim hasn't been officially tested to date, a renowned member of the SGTC Forums (Freefall) did some number-crunching for me. - The cannon, pressurized to its maximum fuel/air
compression ratio, was capable of launching a golf ball over 2-1/2 miles, with an apogee of 1500 meters!
The link pretty much explains everything, but if you have any valid questions, please feel free to ask.
<div align="center"><a href="http://pages.villagephotos.com/page.asp?page_id=3731">Hydro-Pneumatic-Supercharged Combustion Launcher</a></div>