Quadra-Tator: From BoingBoing

Ristow designed a machine gun potato cannon which was a true machine gun spud gun. It had a gravity fed magazine that fed spuds into the firing chamber. I've build a lot of spud guns in my time, mostly like those in Backyard Ballistics. This was a magnitude more powerful and complex. There were four high pressure air tanks with solenoid valves that could shoot potatoes continually and at high velocity at a target until the magazine was emptied. I dubbed it "the Quadra-tator." The airtanks were massive and could hold plenty of compressed air. I calculated the muzzle velocity was well in excess of 85 mph. The rate of fire depended on the speed with which you turned a crank. The crank controlled five pneumatic solenoid valves, one for the magazine loader and one for each of the air tanks. It worked absolutely great. We could get 20 or potatoes in the magazine and could empty the thing in much less than a minute. For the finale, the Quadratator, along with the gatling gun that Dave Mathews built, destroyed a car with it. More Quadra-Tator images on my blog at Notes From the Technology Underground (Me) (Blacktail Books)