Hal Kelly's Bicentennial Carbide Cannon

While researching for my book "Big-Bang Cannons", Joseph Gombotz told me of plans for a giant PVC cannon that was printed in a mechanic's magazine in 1976. He said they sold a lot of Bangsite that year. After a couple of trips to the library, I found the plans in Mechanix Illustrated of June 1976. Here is my copy...
Thanks to Chuck Featherman, the 2MB copy has been replaced with a smaller, and color, pdf file.

Click here to download the plans in PDF format (about 225kb).