by: the Common Constitutionalist
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Compressed air cannons are great. By properly employing one, you can launch almost anything, assuming you can generate enough pressure.
We’ve all seen the Punkin Chunkin, pumpkin launching contests, held at least annually around the United States. These guys (and girls) roll out massive cannons with super long barrels. The longer the barrel, the more speed can be generated and the further the pumpkin will travel. Because of the length of these barrels the pumpkins can be traveling at 600 mph when exiting the cannon which result in great distances.
The television show Myth Busters broke the sound barrier using nothing more than a super long air cannon and a ping-pong ball. The guys on Top Gear (the English original – not the crappy new versions) launched several cars using only an air cannon.
Medieval battles might have been more interesting as the attacking force could have fired projectiles with air cannons, rather than those clunky monstrous trebuchets. It would have been easy to fire over castle walls and a lot more accurate.