Ready the Cannons!: Build Wiffle Ball Launchers, Beverage Bottle Bazookas, Hydro Swivel Guns, and Other Artisanal Artillery
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About this ebook
William Gurstelle
William Gurstelle is an American nonfiction author, magazine writer, and inventor. He is a feature columnist for Make: magazine and the Pyrotechnics and Ballistics Editor at Popular Mechanics magazine.
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Ready the Cannons! - William Gurstelle
THE BEVERAGE BOTTLE BAZOOKA
The Beverage Bottle Bazooka is an easy-to-complete project and it’s a real thrill to use. As you build it, you will combine a tad of physics with a smidgen of chemistry to make something quite wonderful. And there’s a bit of ecology in there as well because the project uses some recycled materials such as cardboard tubes and empty plastic beverage containers. (It’s a good way to repurpose and recycle stuff around your house as well.)
HOW THE BAZOOKA GOT ITS NAME
Back in the 1930s, Bob Burns, an American comedian and singer, built a trombone-like instrument out of two pieces of telescoping brass tubing with a whiskey funnel stuck on one end. Burns named his device a bazooka.
When played, the bazooka produces a weird warbling that sounds like a cross between a kazoo and a trombone. Since Burns was such a popular radio entertainer, his contraption also became popular, at least as a novelty, and eventually so did the word bazooka. When Burns first coined the phrase, it was taken to mean any strange, stove-pipe-shaped gizmo.
In the early years of World War II, a group of army scientists were looking for a name for a new type of rocket cannon that they had just invented. One of the engineers in the group suddenly had an idea. He looked over the odd-looking gun carefully and then called out that it looked just like Bob Burns’s bazooka.
The name stuck.
The new weapon was quickly developed and issued to Allied army forces fighting the German army in Europe. Initially the device had a few bugs, but it was quickly improved through battle testing. Eventually the bazooka became an important part of the army’s arsenal.
This soldier should be wearing safety glasses!
MATERIALS
General purpose glue or hot glue gun
(1) 3-inch inside diameter (ID)* smooth-to-female pipe thread PVC adapter
(1) Thick-walled cardboard tube, 3-inch ID, 4 feet long
(1) 3-inch male pipe threaded plug
(1) ½-inch PVC pipe, 5 inches long
18-inch length of two-conductor 18-gauge speaker wire
(1) Two-hole rubber stopper, small enough to fit inside the beverage bottle
Electrical tape
(1) Piezoelectric gas grill replacement igniter†
(1) 1-inch square wood dowel, 4 inches long
(1) 2½-inch steel corner brace
(2) 4-inch diameter hose clamps
Bottle of rubbing alcohol
2- to 2½-inch diameter, 10-inch long empty and clean plastic carbonated beverage bottle‡
TOOLS
Drill and ¾-inch wood drilling bit
Wire clipper/stripper
Screwdriver
Safety glasses
BUILD THE BEVERAGE BOTTLE BAZOOKA
1.1 Beverage Bottle Bazooka Assembly
1. Apply glue to the interior of the 3-inch diameter threaded PVC adapter. Push the adapter onto the end of the cardboard tube. Allow the glue to dry.
2. Drill a ⁷⁄8-inch diameter hole in the center of the flat part of the threaded plug. Insert the ½-inch PVC pipe through the hole until it extends approximately halfway in. Glue the pipe into place using glue or hot glue and let dry.
3. Strip off ½ inch of insulation from both ends of both conductors of the speaker wire. Insert the speaker wire into the ½-inch pipe until it exits the other end.
4. Pull apart the conductors for two inches from both sides of the speaker wire. Insert one conductor through each hole in the rubber stopper. Then push the rubber stopper firmly into ½-inch pipe as shown in diagram 1.1. Use electrical tape to keep the exposed copper wire in the conductors extended from the end of the stopper and separated by about ³⁄16 of an inch.
1.2 Igniter Detail
5. Drill a hole slightly larger than the diameter of the body of your piezoelectric igniter in the middle of the square wooden dowel as shown in diagram 1.1. (This is typically about ¾ inches, but check before drilling.) Insert the igniter into the hole and glue.
Use two of the screws that came with the steel corner brace to attach the brace to the square dowel. Check diagram 1.1 for the correct orientation.
6. Most replacement piezoelectric igniters come with a wire connector harness. One end of the wire connector harness connects to the electrodes and the other end connects to the spark maker on the grill. For our purposes, we do not need that grill hardware. So simply insert the wires into the appropriate electrode connectors on the piezo igniter and then use a wire cutter to cut off the unneeded grill spark-making hardware. You can discard the unneeded hardware.
1.3 Trigger Detail
7. Make wire-to-wire connections between the speaker wires’ exposed conductors trailing from the ½-inch PVC pipe as shown in diagram 1.4. Wrap the connections with electrical tape.
1.4 Igniter to Spark Gap Connection
Test the device by pressing the button on the piezoelectric igniter. If you’ve done everything correctly, you should see a spark jump between the two exposed conductors. If you don’t see a spark, check the spark gap for width, review diagram 1.4, and rewire as needed.
1.5 Spark Gap Detail
8. Use the hose clamps to attach the piezoelectric trigger to the bazooka body.