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(43 votes) Published: Jan 31, 2005 4:27 p.m. In 2 Favorites Lists Viewed 2122 times
Materials:
4 foot section of 2 inch PVC pipe.
2 foot section of 4 inch PVC pipe.
4 inch to 2 inch reducer.
4 inch sewer plug.
Electric barbeque starter.
Screws, epoxy, hair spray and lots of potatoes that are larger than 2 inches in diameter.
Construction:
Sharpen the end of the two inch diameter pipe, so that it will cleanly core a potato when inserted. At about 4 inches from the other end, insert 3-4 screws in a pattern that will prevent the potato from falling into the combustion chamber.
Using the epoxy, glue the pipes to the reducer, and the sewer pipe end on the back of the gun.
Drill two holes across from one another, and install the barbeque lighter, following the directions that come with the part. Note: Try to buy a two-wire push button, rather than a single wire model, as it is simpler to install. Use a nail or bolt to serve as the ground contact. (Canadian Tire has a nice one for about $11.00) Test the distance before you glue things into place, to make sure you consistently get a nice spark.
Operation:
Insert a potato into the barrel. Using a broom handle or similar, push the potato down to the screws at the bottom.
Unscrew the plug at the back, and give a short burst of hair spray. Note that the amount of fuel is VERY critical; too much will not ignite, and not enough will give you a poor shot. Other references suggest WD-40; try just about any aerosol, but avoid things like liquid oxygen, as PVC shrapnel is difficult to remove.
Aaim, and ignite.
Once you are comfortable with the operation, try target shooting, distance records, and bazooka style shoulder launches. Our best shot is about 650 feet.
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