The Mother of All Potato Cannons

(Bill Gurstelle is guest blogging here on Boing Boing. He is the
author of several books including Backyard
, and the recently published Absinthe
and Flamethrowers

My friend Christian Ristow was at Maker Faire with his giant pneumatically powered sculpture called Hand of Man. It's great. It's a highly interactive piece in which one puts on a glove with sensors and controls a multi-ton pneumatic hand capable of picking up and crushing a refrigerator.

hand of man laughing squid.jpg
Photo – Scott Beale at Laughing Squid

About a year or so ago, I worked on a TV pilot for Discovery Channel starring Christian. He is perhaps the most gifted mechanical artist I've ever met.

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 built 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 that could shoot potatoes continually and at high velocity until the magazine was emptied. I dubbed it "the Quadra-tater."

IMG_1097 bill and quad.JPG

The airtanks were massive. I calculated the muzzle velocity to be 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.

quad and gattling gun resized for boingboing.jpg

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 Quadratater, along with a gatling gun that Dave Mathews built, destroyed a car.

destroyed car sized for boingboing.jpg

more Quadra-Tator images on my blog at Notes From the Technology Underground